Behavioral results of oxytocin administration in children with ASD.
\\n\\n
Released this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\\n\\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'IntechOpen is proud to announce that 191 of our authors have made the Clarivate™ Highly Cited Researchers List for 2020, ranking them among the top 1% most-cited.
\n\nThroughout the years, the list has named a total of 261 IntechOpen authors as Highly Cited. Of those researchers, 69 have been featured on the list multiple times.
\n\n\n\nReleased this past November, the list is based on data collected from the Web of Science and highlights some of the world’s most influential scientific minds by naming the researchers whose publications over the previous decade have included a high number of Highly Cited Papers placing them among the top 1% most-cited.
\n\nWe wish to congratulate all of the researchers named and especially our authors on this amazing accomplishment! We are happy and proud to share in their success!
Note: Edited in March 2021
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Subsequently, he received his MD diploma (Medicine) from the University of Rajasthan in 1974, and DM (Neurology) from the Postgraduate Institute of Medical Education & Research (PGIMER), Chandigarh in 1985. He served in the Armed Forces India as a Physician and Neurologist for 24 years and retired as Lt Col in 1998. From 1994 to 1998, he also served as an Associate Professor, Armed Forces Medical College, Pune. He was awarded Chief of Army Staff’s Commendation in 1980. Since 1998, he has been pursuing clinical practice in neurology at various hospitals at Jodhpur and at Guwahati Assam. He has been a Visiting Professor, Ph.D. guide, and advisor to Jain Visva Bharti University (JVBI) and Bhagwan Mahaveer International Research Centre (BMIRC), Ladnun, Rajasthan since 2009. He is a Director of Research at the Spiritual Training Research Foundation (STRF), Mumbai, India. 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It is more prevalent in women, both as regards the number of cases and extent of this type of pain (Fejer et al., 2006). Neck pain can occur due to jaw disorders, whose etiology is complex and unresolved (Bretan et al., 2005). These disturbances may trigger other affection, in addition to neck pain, such as: headaches, earaches, popping joints, mandibular locking, and lateral deviation of the mandible (Okeson, 1998; Simma et al, 2009). The onset of these affections may be linked to the close relationship between the cervical spine and temporomandibular joint (Tedeschi-Marzola, 2005), and may also included the equilibrium relationship between the braincase, temporomandibular joint, articulation of the skull and cervical spine (Butler, 2003).
The management of individuals with chronic pain has been a challenge, since various factors may interfere in the development of this type of pain. Outstanding among these factors are emotional situations; interests in obtaining workers’ compensation benefits – being laid off work and/or retired due to disability (Kraychete et al. 2003). Moreover, conditions of anxiety and depression tend to make it difficult to apply strategies used for the treatment/control of neck pain (Institute for Clinical Systems Improvement, 2007).
Neck pain and headaches are syndromes that represent a clinical challenge for dentists and physicians (Lu et al., 2001). Furthermore, neck or cervical pain has been recognized as a frequent complaint among adults, a fact that has resulted in a high demand for medical services, in addition to causing absenteeism and incapacity to work (Willich et al, 2006; Matsudaira et al., 2010). Painful disorders that affect the neck area are known as common incapacity affections that involve high cost medical treatment (Haines et al., 2009).
Conventional therapeutic treatments are not always capable of producing chronic pain relief (Simma et al., 2009). The history of acupuncture reveals the existence of an ancient relationship between this therapy and the treatment of pain (Filshie and Cummings, 2001).
The use of acupuncture in public health care systems has been recommended by the World Health Organization – WHO (1999). This Organization has also recommended the use of acupuncture in the treatment of neck pain, in view of the proven effectiveness of this therapy (WHO, 2002).
In some countries the use of acupuncture in addition to conventional medical treatment has shown cost-benefit (Kim et al., 2010). As acupuncture is a non-pharmacologic treatment modality (Wang et al., 2008) and has presented satisfactory results in reducing pain intensity (Lu et al., 2001) it could be more widely used in chronic health situations, especially for primary care in the public health service.
The aim of the present study was to describe the results obtained with acupuncture treatment applied to adult patients with chronic neck pain, assisted by a public service providing primary health attention, located in the south of Spain during the year 2008.
The present work is characterized as clinical study (case series) conducted to verify the possible proportionate benefits to the health of patients with chronic neck pain treated by acupuncture. The study sample was composed of 100 patients diagnosed with chronic cervical pain. Data collection was accomplished in the Pain Treatment Unit - UTD, located at the Doña Mercedes Health Centre (Spain). Patients included in the present study were those who signed the informed consent document, with complaint of chronic cervical pain (pain experience equal to or longer than 03 months) and, who then received two acupuncture sessions during the months from January to December of 2008 (participation in at least 2 sessions).
To measure pain intensity, the Visual Analogue Scale (VAS) from 0 to 100 mm was used (Wewers & Lowe, 1990), and the Likert Scale from 0 to 4 points was used to measure the following variables: frequency, level of incapacity caused by the pain, level of sleep disorders caused by pain, and analgesic consumption (Likert, 1932; Likert, 1967).
The other variables were analyzed through the absolute and relative frequencies (gender, marital status, and time of pain experience) or mean and standard deviation (age). Initially the data were tabulated in spreadsheets (Excel) and later the Software SPSS version 17 was used to perform statistical analysis. The patients were submitted to 1 acupuncture session a week.
The data were analyzed by means of comparing the values obtained in the first and in the last acupuncture consultation. The Wilcoxon test for two dependent samples was used for intensity, frequency and level of incapacity caused by the pain; level of sleep disorders caused by pain; and analgesic consumption. The power of the test was a minimum of 0.80, and Alpha of 5%, according to the pattern most frequently used in the medical literature (Gardner & Altman, 1986; Gong et al., 2000; Lauer, 2006).
The 100 patients participating in this study, received an average of eight acupuncture sessions, and the majority of them were women (84%).
As regards marital status, 78% of the individuals were married; 12% single; 8% widowers and 2% divorced. The average of age and the respective standard deviation were 56 and 13 years.
The results with regard to pain experience indicated its predominance for a period from 12 to 180 months (71%), which corresponds to a period of 1 to 15 years; followed by pain for a period of less than 12 months (17%); pain for a period of longer than 180 months (12%).
The results of the Wilcoxon test for dependent samples revealed significant changes (p <0.0001) in the: pain intensity, pain frequency, analgesic consumption, incapacity caused by pain and sleep disorders due to pain (figure 1, 2, 3, 4 and 5).
The pain intensity was classified in the first acupuncture session and for most of the patients it was close to the maximum value of VAS (median = 7), whereas in the last session, the patients reported pain close to the lowest degree of this scale (median = 2) – figure 1.
Pain intensity in the first and in the last acupuncture session (Median)
As regards pain frequency (figure 2) it was observed that in the first session the majority of the patients reported the presence of constant pain (median = 4), and at the end of the session this population reported the presence of persistent pain with duration of at the most 06 hours a day (median = 2).
In the first session, most of the patients reported that they consumed analgesic and respected the doses recommended by the medical practice guidelines for the illness that affected them (median = 2), however, in the last session of the proposed treatment, practically the absence of consumption of these medicines was related (median = 0) – figure 3.
Data as regards the level of incapacity (Graph 04) demonstrated that in the first acupuncture session, most of the patients reported that they were unable to accomplish daily tasks (median = 2), while in the last session, most of the patients reported no such incapacity (median = 0).
Pain frequency in the first and in the last acupuncture session (Median)
Analgesic consumption in the first and in the last acupuncture session (Median)
Incapacity caused by pain in the first and in the last acupuncture session (Median)
Sleep disorder caused by pain in the first and in the last acupuncture session (Median)
In the first treatment session the patients classified sleep disorders as being of degree 1 (median = 1), which corresponds to the fact of waking up occasionally during the night because of pain, however, in the last session, most of the patients reported that they did not to wake up for this reason (figure 5).
In the medical literature, the type of study conducted by observing a group of patients group who present common characteristics is called a "case series". Such studies are used to describe some of the clinical, physiopathological or functional aspects of affections, in addition to reporting aspects with regard to the treatment or diagnostic procedure used in this context (Porta, 2008).
Due to the fact of presenting a detailed report of the clinical experience of the studied subject, the publication of case series can indeed contribute to the production of relevant bibliographical material. On the other hand, this methodology presents some limitations that prevent the inference of a causal relationship (Kestenbaum, 2009) and the confirmation of hypotheses (Hennekens & Buring, 1987).
The lack of control groups is an inherent feature and limiting the case series (Porta, 2008). However, this methodology has been widely incorporated in the assessment of health technology, especially when there is no strong evidence on the effectiveness of therapy tested (Dalziel et al, 2005).
Considering the advantages and disadvantages mentioned above, in the present study the design principles called case series it was adopted in order to make a contribution to more detailed scientific knowledge with regard to acupuncture treatment for cases of chronic cervical pain attended by the public service. That was made because decisions about health policies are going to be necessary even in the absence of scientific evidence produced by means of the randomized clinical trials (Dalziel et al., 2005). The importance of conducting this type of study is pointed out insofar as it represents the possibility of helping other researchers that have produced similar observations, aiming to create better conditions for formulating hypotheses (Hennekens & Buring, 1987) and for developing future studies with higher methodological quality.
Chronic pains have been considered as a severe problem in health attendance, not only in terms of human suffering and morbidity, but also in terms of the economic implications for society (Sjogren et al., 2009). Pains that affect the area of the back, among these, the cervical pain represent one of the three most frequent complaints among the affections of the musculoskeletal system (Trinh et al, 2007). They have been considered a frequent and common health problem in the adult population (Wenig et al., 2009; Kaaria et al., 2009).
The effect of an appropriate treatment performed by acupuncture can last up to three years after the last session (He et al.; 2004). Ezzo et al. (2000) verified that 06 acupuncture sessions was associated with positive results (benefits) and other authors corroborate these results (Petrie 1983; Petrie 1986; White 2004). In the present case series this association was not verified. However, it was verified that the patients received an average of 08 acupuncture sessions and that the results of these interventions demonstrated significant improvement in all the studied variables.
Cervical pain has been reported in the literature as being a common symptom manifested in the word; and it mainly affects women (Fejer et al., 2006; Trinh et al., 2007). In the present study it was verified that most of the patients treated with acupuncture were women (84%), finding agrees with Holdcroft et al. (2005) and according to Vas et al. (2007) represents the profile of users of the public health services offered in the studied area.
Married individuals composed the greater part of the sample in the present research (78%). Similar data are in agreement with these results (Niemtzow et al., 2008). However, it is pointed out that marital status has not been evaluated in most of the published studies on chronic cervical pain treated with acupuncture.
The mean age verified in the present study, when compared with researches that evaluated the management of the chronic cervical pain with the above-mentioned therapy, was higher than the value mentioned in the study published by Salter et al. (2006); Zheng et al. (2008) and lower than that mentioned in the study published by Itoh et al. (2007).
In agreement with Sardá Jr. et al. (2009) scientific studies published had recognized that several psychological factors can influence the degree of pain experience, the reaction of the individuals to the perception of pain and impact of pain on their daily activities. Thus, the experience of chronic pain has been defined as being a product of the complex and dynamic interaction of several biological, social, psychological, environmental and family factors which result in a non linear relationship between the beginning of benign chronic pain and their effects on the human body (Shipton, 2008). In the present study the time of experience of the pain felt occured predominantly between 12 and 180 months (71% of the cases) which corresponds to an average of 6.5 years, higher than the value found by Itoh et al (2007); Willich et al. (2006); Salter et al. (2006).
According to He et al. (2004), the establishment of an appropriate treatment with acupuncture was capable of reducing effectively the intensity as well as the frequency of muscular pain located in the cervical area. The findings of the present research agree with data of the above-mentioned study and corroborate the results of other randomized controlled clinical studies conducted by Itoh et al. (2007) and Witt et al. (2006).
It is known that opioid analgesics have been prescribed as fundamental therapy of first choice in the treatment of patients with chronic pain (Reid et al., 2002; Rosenblum et al., 2008; Victor et al., 2009). However, patients who were treated in the long term with this type of medication became more depressive, had poor life quality (Zheng et al. 2008) and presented passive attitudes to chronic pain management (dependence and addiction) (Breivik, 2005). Sleepiness, qualm, vomiting, constipation and possibility of the need for gradual increase in the dose of the medicine are mentioned in the literature as adverse effects of opioid analgesic consumption (Gourlay, 1999).
Borenstein (2007) reported that non pharmaceutical therapies such as acupuncture, for instance, present the potential of reducing chronic cervical pain and represent a therapeutic modality exempt from toxicity. The reduction of the consumption of analgesics due to acupuncture treatment for chronic cervical pain was verified in the present study and this findings ratifies similar results in two other publications by Vas et al. (2007) and Hansson et al. (2008) respectively.
Witt et al. (2006) verified a reduction in the intensity and incapacity caused by the chronic cervical pain in patients treated with acupuncture. Similarly, in a study published by Hansson et al. (2008), adult patients affected by chronic musculoskeletal pain reported an increase in the capacity to perform daily activities, as well as in work activities during a period of up to 06 months after the end of acupuncture treatment. Such findings agree with the results of the present research, which verified a reduction in the incapacity caused by chronic cervical pain in the studied population.
The findings of the present study indicate that the patients treated with acupuncture presented a significant statistic reduction in sleep disorders. However, this condition is a theme that has hardly been explored. In agreement with some authors, the latest evidences on effect of acupuncture in this disorder cannot yet be considered clarified (Chen et al., 2007; Yeung et al., 2009).
The characteristics of the researches on back pain, among these cervical pains, have recently been modified and have gone from a biomedical approach to a biopsychosocial approach (Sieben et al., 2009). Thus it is important to remember that the attitude of patients submitted to treatment with alternative and complementary therapies can be a predictive factor for positive results (Sasagawa et al. 2008), nevertheless, studies conducted by Lewith et al. (2002) and White (2003) suggest the opposite. The present scientific investigation did not explored the above-mentioned characteristic, however, the explanation of the interference of the patient’s attitude in acupuncture treatment, is relevant and interesting data to be studied in future works. Other approaches such as: cost effectiveness, variations of acupuncture technique, association of cervical pain with other areas of the spine also constitute interferences that need to be studied to perfect the understanding and planning of future strategies in public service of the population by means of acupuncture and auriculotherapy.
Reports of studies conducted over a period of more than 10 years revealed that the treatment of chronic pains by acupuncture presented acceptable cost-effectiveness when compared with conventional therapies used for treating this type of pain, in addition to demonstrating that this therapy was clinically effective in these circumstances (White & Cummings, 2009). Other publications have reported that the offer of acupuncture therapy in the primary health care service was capable of providing a reduction in routing patients at other levels of attention including reducing costs related to prescriptions (Johnson, 2008).
The use of acupuncture promoted significant economy with regard to expenses originating from conventional pharmacological treatment in individuals affected by migraine who were attended in units of the public service of health in Italy (Liguori et al., 2000). In England in the same treatment mentioned above was verified an additional cost due to the use of acupuncture when it was used as supporting treatment to the conventional therapeutics. Such increment was considered a small expense when compared with the improvement in the patients\' quality of life and to the cost-effectiveness of the use of acupuncture in comparison with the number of other interventions performed in the English health system (Wonderling et al., 2004).
With further regard to the expenses incurred with public health systems in agreement with the international threshold of the values of cost-effectiveness in health acupuncture can be considered a valid strategy for the alternative treatment of chronic cervical pain in agreement with the cost-effectiveness relationship published in a multicentric study conducted in the public health service in Germany (Willich et al., 2006).
The present study was conducted in a public service of primary attention and the improvements perceived in the levels of the patients\' health aroused the idea that an increase in the offer of this type of therapy is desirable in view of fact that some authors verified clinically pertinent benefits in patients attended by acupuncture, in these services (Valdés et al., 2001; Vickers et al., 2004; Vas et al., 2007; Witt et al., 2008). Furthermore the use of the mentioned therapy constitutes an alternative important to the treatment of patients who do not respond to the conventional medical treatment applied to musculoskeletal pains (Kam et al, 2002).
It was concluded that acupuncture can be considered a treatment option in the cases of chronic cervical pain in adult patients assisted by the public health service in the primary care brought as it important benefits to the health of these individuals.
It is estimated that 1 in 59 children in the United States has a diagnosis of Autism Spectrum Disorder (ASD) [1], which is characterized by life-long social communication deficits and the presence of restricted interests and/or repetitive behaviors [2]. Though all individuals with ASD meet common diagnostic criteria, they display a wide spectrum of behavioral manifestations, thus producing a wide array of heterogeneous phenotypes. As such, a multitude of behavioral interventions exist to address common symptoms of ASD, many of which have been tailored to address the heterogeneity of the disorder. Behavioral interventions are currently one of the most effective methods for improving social-communication skills, as no medications have been approved to “treat” social communication behaviors in ASD.
In the current chapter, we propose that administering the neuropeptide oxytocin in conjunction with evidence-based behavioral interventions may lead to improved outcomes in social-communication for children with ASD. Specifically, we propose that oxytocin administration may “prime” social reward circuitry in the brain, allowing behavioral interventions designed to increase social motivation/initiation to be more effective. This theoretical model draws from the following research: (1) the social motivation hypothesis of ASD, (2) animal and human literature related to oxytocin, (3) studies of oxytocin levels in children with ASD, (4) behavioral changes after oxytocin administration in children with ASD, (5) neural changes after oxytocin administration in children with ASD, and (6) neural changes after behavioral interventions in children with ASD.
Subsequent sections will briefly review these research areas. We propose that taken together, the aforementioned literature provides a theoretical basis for combining oxytocin administration with behavioral interventions to improve social-communicative outcomes for children with ASD.
The social motivation hypothesis posits that early impairments in social attention (due to social stimuli being less rewarding for individuals with ASD compared to their neurotypical peers) set a series of negative developmental consequences in motion. Initial impairments in social attention--which often manifest as decreased orienting to one’s own name, diminished eye contact, and decreased social initiations in early life--lead to fewer opportunities for social learning, which in turn lead to deficits in social communication, social skills, and social-cognitive development [3, 4]. The proposed neural mechanisms underlying the social motivation hypothesis are the reward centers in the brain including the amygdala, ventral striatum, and orbito-frontal cortex [4]. Importantly, social motivation is thought to involve both oxytocin and the dopaminergic reward pathways [5, 6]. Given the hypothesized role of oxytocin in social motivation, it is not surprising that oxytocin has been considered as a potential mechanism for understanding social deficits in ASD--and that oxytocin administration has been considered as a potential therapeutic agent.
Oxytocin is a neuropeptide produced in the hypothalamus [7]. Colloquially referred to as the “love hormone,” oxytocin has been implicated in the formation of pair bonds in a variety of species, including rats and prairie voles [8, 9, 10]. As such, oxytocin has been extensively studied and utilized for its effects on social cognition and prosocial behaviors [11, 12, 13]. It has been hypothesized that interactions between oxytocin and the dopaminergic reward system support social affiliative behaviors and social bonds [14]. Further evidence of the connection between oxytocin and the dopamine reward system comes from overlap in locations of receptor binding sites and neuronal fibers [15]. Furthermore, oxytocin cells in the hypothalamus have been found to express dopamine receptors [16]. Importantly for neurodevelopmental disorders such as ASD, oxytocin is developmentally regulated and its receptors are malleable, particularly in response to parent-child interactions [17, 18].
In contrast to other conditions in which both behavioral and medical treatments are supported by empirical evidence, no medication is currently approved to improve core symptoms of ASD. Although two pharmaceutical medications, risperidone and aripiprazole, have been approved by the Federal Drug Administration for use in ASD, they do not address core symptoms. Rather, they have been approved to treat ancillary symptoms of ASD, such as aggression and irritability [19]. Due to the lack of pharmacological interventions to address the core symptoms of ASD, there has been a focus on compounds that directly address social communication symptoms. Given oxytocin’s role in prosocial behaviors, exogenous administration of the neuropeptide has been considered as a potential therapeutic agent in ASD.
Modahl and colleagues [20, 21] were the first to provide evidence of reduced levels of oxytocin in children with ASD. Specifically, the authors found that compared to their neurotypical peers, oxytocin does not increase prior to the onset of puberty in individuals with ASD. This suggests that oxytocin is less available to individuals with ASD during development [21]. Our understanding of oxytocin in individuals with ASD has since been shaped by research that suggests deficits in oxytocin may reveal the pathogenesis of ASD. No known mechanistic pathway exists to form a substantial link between the neuropeptide and development of ASD, but studies support the idea that lower concentrations of oxytocin are strongly related to social impairments [22].
Early studies of the endocrine system have found that oxytocin release occurs differently in children with ASD compared to their neurotypical peers, suggesting that oxytocin may be disrupted early in development in children with ASD [23]. Oxytocin blood plasma levels increase throughout neurotypical development, while children with ASD exhibit lower levels of plasma oxytocin [24] that are stable over time [21]. Therefore, disruptions of the oxytocin system may possibly occur early in life in individuals with ASD, resulting in cascading consequences.
To our knowledge, eight studies have been conducted to measure behavioral results of oxytocin administration for children with ASD [22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33]. Though the current chapter focuses on children, see the meta-analysis by Ooi and colleagues [32] for a review of randomized control trials of oxytocin administration in both children and adults. See Table 1.
Authors | Study Design & Participants | Oxytocin Administration and Dosage | Primary Outcomes |
---|---|---|---|
Guastella et al. [25] | Double-blind placebo-controlled design. 16 ASD (all male)
| A single dose of oxytocin and a placebo nasal spray 1 week apart. (a) OXT nasal spray and (b) placebo containing all ingredients except active oxytocin puff per nostril contained 3 IU. Older participants (aged 16 –19, n = 5) received a dose of 24 IU (4 puffs per nostril, 3 IU per puff). Those aged 12 to 15 years n = 11 received 75% dose of the adult dose at 18 IU (3 puffs per nostril, 3 IU per puff). | Oxytocin improved performance on the REMET (particularly on “easy” items) compared to placebo. |
Tachibana et al. [26] | Open label, single arm long-term design. 8 ASD (all male)
| Intranasal oxytocin twice a day for approximately 7 months; dosage was increased in a stepwise fashion every 2 months (from an initial dose of 8 IU to 24 IU). Placebo was inserted between the dosing steps as a washout period. Concentration of OXT in the nasal spray was changed so that a total of 6 puffs/dose twice a day was maintained throughout the protocol. | Communication and social interaction scores on ADOS-G were significantly improved after oxytocin administration. |
Anagnostou et al. [27] | Single arm, open label design. 15 ASD (11 male, 4 female)
| Twice per day (morning and night) for 12 weeks; 24 IU total a day | Improvements on the following measures: ABC; SRS, BASC social skills and functional communication subscales, Let’s Face It! Skills Battery, Irony and Empathy Task, Strange Stories Task, CASI, RBS-R, and C-YBOCS |
Dadds et al. [28] | Double-blind, placebo controlled randomized controlled design. 38 ASD (all male). 19 in OXT group; 19 in placebo group
| Treatment group: intranasal spray contained: oxytocin, mannitol, glycerine, methyl parraben, propyl, parraben and purified water. Placebo contained all ingredients except the active oxytocin and mannitol. 5-day trial. Each nostril received a 12 IU dose (6 IU per puff) for a total of 24 IU/day. | No significant benefit of oxytocin versus placebo on SSRS, SRS, or an emotion recognition task. |
Guastella et al. [29] | Double-blind placebo-controlled design. 50 ASD (all male); 26 in OXT group, 24 in placebo
| Intranasal oxytocin or placebo, 2 times per day for 8 weeks. Older participants (aged 16 –19, n = 5 in each group) received a dose of 24 IU. Those aged 12 to 15 years received 75% of the adult dose at 18 IU. | No improvements related to oxytocin were observed on primary outcome measures (SRS or CGI-Improvement scale). |
Yatawara et al. [30] | Double-blind, randomized, placebo-controlled crossover (A/B, B/A) design. 31 ASD (27 male, 4 female).15 in OXT then placebo group; 16 in placebo then OXT group
| Intranasal oxytocin or placebo twice per day for 5 weeks, followed by a 4 week wash-out period, and then received either oxytocin or placebo (whichever they did not receive in the first phase) twice per day for 5 weeks. 24 IU total per day; 12 IU in morning and 12 IU at night. | Social-communication skills (SRS) improved significantly after oxytocin versus placebo. Ratings on the CGI were significantly better after oxytocin versus placebo. |
Parker et al. [22] | Double-blind, randomized, placebo-controlled design. 32 ASD (27 males, 5 females). 13 in OXT group; 14 in placebo group
| Treatment group: Syntocinon nasal spray; Placebo group: placebo solution consisted of all the ingredients used in the active solution except the oxytocin compound. Participants’ parents then were provided with a 4-week drug supply and were responsible for their child’s continued twice daily dosing (24 IU per dose, 4 IU per puff, 48 IU/day) at home. | ASD participants who received oxytocin had greater improvements on the SRS compared to ASD participants who received the placebo. Pre-treatment plasma oxytocin negatively predicted the magnitude of improvement on the SRS (i.e., participants who had lower concentrations of oxytocin pre-treatment demonstrated the largest improvements in SRS scores). |
Strathearn et al. [31] | Randomized, double-blind, placebo-controlled crossover design. 16 ASD
| One nasal solution (oxytocin or placebo) on Visit 1 and the alternate solution on Visit 2. Participants 16 years and older received 24 IU oxytocin (10 puffs alternating between nostrils 2.4 IU). Participants aged 12–15 years received 7 puffs (16.8 IU), and participants aged 8–11 years received 5 puffs (12 IU total). | After nasal oxytocin was administered to ASD participants, differences in visual preference for structured/systemized images between ASD and TD participants was eliminated. |
Behavioral results of oxytocin administration in children with ASD.
In 2010, Guastella and colleagues [25] completed a double-blind placebo-controlled study with 16 adolescent boys with ASD (ages 12-19). 45 minutes after oxytocin (or placebo) administration, participants completed the Reading the Mind in the Eyes Task, or RMET [33]. Compared to placebo, oxytocin improved performance on the REMET for 60% of participants. When the authors split REMET items into “easy” and “hard” categories, the effect of oxytocin was particularly significant for “easy” items. This was the first investigation of the results of oxytocin administration to children/adolescents, and suggested that oxytocin improves emotion recognition in a group of males with ASD.
Tachibana and colleagues [26] measured behavioral changes associated with an open label (participants knew they were receiving oxytocin), single arm (no placebo condition) long-term oxytocin administration in 8 boys with ASD (ages 10-14). Participants received intranasal oxytocin twice a day for approximately 7 months. Oxytocin dosage was increased in a stepwise fashion every 2 months (from an initial dose of 8 IU to 24 IU). Outcome measures were scores on the Autism Diagnostic Observation Schedule—Generic (ADOS-G; [34]), Aberrant Behavior Checklist (ABC; [35]), and Child Behavior Checklist (CBCL; [36]). ADOS-G scores for items comprising the “communication,” and “social interaction” sub-scales and the sum of both sub-scales were significantly improved after oxytocin administration. No change in ADOS-G scores related to play/imagination of restrictive/repetitive behaviors (RRBs) were observed. No significant changes were observed for the ABC or CBCL after oxytocin administration though some scores improved at a trend level. The authors note that oxytocin administration appeared to specifically affect social communication and interaction, but did not affect RRBs or play. However, the study was open label, single arm. Therefore, caution is needed when interpreting these findings.
Anagnostou and colleagues [27] administered intranasal oxytocin to 15 male and female adolescents (ages 10-17) twice per day for 12 weeks in a single arm, open label design. Participants completed a follow-up session 12 weeks after discontinuation of oxytocin administration. Though the authors measured change on a variety of behavioral measures related to social function, social cognition, anxiety, and repetitive behaviors, the aim of the study was to measure the safety of varying dose levels of oxytocin in this population. Safety results suggested that .4 IU/kg twice per day for 12 weeks produced no serious or severe adverse events. Using the Clinical Global Improvement-Social (CGI), almost half of the sample were classified as “responders” at 12 weeks, and most responders at 12 weeks maintained improvements 12 weeks after the end of the study (e.g. 24 weeks from the beginning of the study). At 12 weeks, significant improvements were observed for the following measures: ABC [35], Social Responsiveness Scale (SRS; [37]), Behavioral Assessment System for Children (BASC; [38]) social skills and functional communication subscales, Let’s Face It! Skills Battery (LFI; [39]), Irony and Empathy Task [40], Strange Stories Task [41], Child and Adolescent Symptom Inventory (CASI; [42]), Repetitive Behavior Scale-Revised (RBS-R; [43]), Child Yale-Brown Obsessive-Compulsive Scale (C-YBOCS; [44]). At 24 weeks, significant improvements were observed for the following measures: BASC functional communication T-Score, RMET [33]--difficult items, Irony and Empathy Task, and C-YBOCS. The authors note that not all children demonstrated behavioral improvements in response to oxytocin administration, and that more information is needed about individual differences in response to oxytocin. Nevertheless, a broad array of measures was, on average, shown to increase after oxytocin administration.
Dadds and colleagues [28] completed a 5-day double-blind, placebo controlled, randomized controlled trial with 38 boys with ASD (ages 7-16). This study is unique as it combined oxytocin administration with consecutive parent-child interaction training sessions over a period of 4 days. The authors did follow-up testing 3 months after the completion of the 5-day intervention. The parent-child interaction training consisted of emotion recognition training using the Mindreading (MR) program [45], and short video clips demonstrating successful client interactions (e.g. eye contact, body language, responsiveness). Outcomes included parent-child interaction tasks (free play, emotion talk, and an “I love you” task in which a parent expresses positive emotions and the child’s response is recorded), and parent-questionnaire measures (Social Skills Rating Scale, or SSRS, [46]; SRS, [37]), and an emotion recognition task (UNSW Facial Emotion Task, [28]). Analysis of the parent-child interaction tasks, parent rating scales, and emotion recognition tasks indicated behavioral improvements over time in both the placebo and oxytocin groups, but no significant benefit of oxytocin versus placebo. We note that although this study combined oxytocin and behavioral intervention, the intervention was not one previously validated for improving core symptoms of ASD, and the study timeline was short (5 days).
Guastella and colleagues [29] completed a double-blind placebo-controlled trial with 50 male participants with ASD (ages 12-18). Participants received either placebo or oxytocin nasal spray twice a day for 8 weeks. Participants were assessed again 3 months after completion of the study. Primary outcome measures were the SRS [37] and clinician ratings on the Clinical Global Impressions--Improvement scale (CGI-Improvement). Secondary outcome measures included the Developmental Behaviour Checklist, or DBC [47] and Repetitive Behavior Scale-Revised, or RBS [43], RMET [33], the Diagnostic analysis of nonverbal accuracy, or DANVA [48], and Biological Motion [49]. No improvements related to oxytocin were observed on the primary or secondary outcome measures.
Yatawara and colleagues [30] completed a double-blind, randomized, placebo-controlled crossover (A/B, B/A) design trial in 31 children with ASD (ages 3-8). Children received intranasal oxytocin or placebo twice per day for 5 weeks, completed a 4-week wash-out period, and then received either oxytocin or placebo (whichever they did not receive in the first phase) twice per day for 5 weeks. Primary outcome measures were scores on the SRS [37], and scores on the RBS-R [43]. Secondary outcome measures were changes in ADOS scores, scores on the DBC [50], clinician-rated clinical global impressions-improvement scale [51], and the Caregiver Strain Questionnaire [52]. Results indicated that parent-rated social-communication skills (SRS) improved significantly after oxytocin versus placebo. Ratings on the CGI were significantly better after oxytocin versus placebo. To our knowledge, this study includes the youngest sample of children with ASD to receive oxytocin versus placebo in a randomized, double-blind trial. This work provides behavioral evidence of symptom reduction in ASD in response to prolonged oxytocin administration.
Parker and colleagues [22] completed a double-blind, randomized, placebo-controlled trial with 32 children with ASD (ages 6-12). Children received either intranasal oxytocin or placebo twice per day for 4 weeks. The primary outcome measure was scores on the SRS [37]. Secondary outcome measures included scores on the RBS-R [43] and Spence Children’s Anxiety Scale [53]. Additionally, authors measured plasma oxytocin concentrations both before and after participation in the trial, as well as expression of genes related to oxytocin receptors (Oxytocin Receptor Gene, OXTR, and Vasopressin Receptor 1a; V1AR). Results suggested that children who received oxytocin demonstrated greater improvements on the SRS compared to those receiving placebo. Additionally, pre-treatment plasma oxytocin negatively predicted the magnitude of improvement on the SRS. That is, individuals who had the lowest concentrations of oxytocin pre-treatment demonstrated the largest improvements. The authors hypothesized conflicting findings of previous oxytocin trials may be attributable to variability in pre-treatment concentrations of oxytocin. That is, previous trials did not measure pre-treatment oxytocin concentrations which may have reduced their ability to accurately measure improvement. When the authors did not include pre-treatment oxytocin, concentration findings were non-significant. In fact, inclusion of these pre-treatment “biomarkers” improved the statistical models by 43%, which underscores the importance of measuring individual variability in pre-post measurement designs.
Strathearn and colleagues [31] completed a double-blind, placebo-controlled crossover study with 16 children with ASD and 16 neurotypical children (ages 8-19). Participants completed an eye tracking paradigm on two occasions: once after receiving oxytocin and the other after receiving a placebo nasal spray. The authors measured participants’ eye gaze while viewing images that varied on how organized or structured they were. The authors’ primary focus was whether or not oxytocin affected eye gaze patterns when viewing stimuli that varied on levels of systemization. Results demonstrated that after oxytocin administration, children and adolescents with ASD displayed a decreased preference for highly systemized stimuli, whereas neurotypical children and adolescents displayed increased preference for systemized images. Overall, when participants received placebo, children and adolescents with ASD displayed more of a preference for systemized stimuli compared to their neurotypical peers. After both groups received oxytocin this difference was no longer significant (e.g. participants with ASD looked more similar to their neurotypical peers, and neurotypical children and teens looked more similar to their peers with ASD). The authors concluded that oxytocin administration may have differential effects on individuals with and without ASD, but that oxytocin appears to decrease preference for highly organized (e.g. systemized) stimuli in ASD.
Overall, studies of the behavioral effects of oxytocin in children in ASD are mixed, with some investigations observing significant behavioral changes [22, 25, 26, 27, 30, 31], whereas others find no evidence for change as a function of oxytocin versus placebo administration [28, 29]. A likely explanation for these disparate findings is outlined by Parker and colleagues [22]. The authors noted that measuring participant’s plasma oxytocin levels provided a critical “biomarker” for predicting a given individual’s response to oxytocin administration. Most studies do not measure oxytocin concentration prior to administration and therefore may miss individual differences which significantly impact outcomes. Parker and colleagues [22] noted that without the addition of pre-administration plasma oxytocin concentration into their predictive models, their results would have indicated no difference between oxytocin and placebo. When pre-administration oxytocin levels were included, their models were improved by 43%. This underscores why it is critical to consider biological differences in individuals
To our knowledge, only 3 studies have investigated the effects of oxytocin on brain activity in children with ASD [54, 55, 56]; see [57] for a review. See Table 2.
Authors | Participants and Oxytocin Administration | Design and Stimuli/Paradigm | Major Findings |
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Gordon et al. [54] | 21 ASD (3 females; 18 males)
Older participants (16 – 19 yrs.) received a dose of 24 IU (4 puffs per nostril); 15 yr olds received 18 IU (3 puffs per nostril); Younger participants (7 - 11 yrs.) received 12 IUs, (1 puff per nostril); or placebo. Testing was repeated on consecutive study visits. Order was randomized. | Randomized, double-blind, cross-over design. fMRI. Reading the Mind in the Eyes Test (RMET). Participants were instructed to label the mental state of each facial picture, or label the category of automobile images. | Social condition: Enhanced activity in the dorsal and ventral striatum, premotor cortex, posterior cingulate, inferior parietal lobule, and posterior STS in response to oxytocin compared to placebo. |
Gordon et al. [55] | 20 ASD (3 females)
Older participants (16 – 19 yrs.) received a dose of 24 IU (4 puffs per nostril); 15 yr olds received 18 IU (3 puffs per nostril). Younger participants (7 - 11 yrs.) received 12 IUs, (1 puff per nostril); or placebo. Testing was repeated on consecutive study visits. Placebo or oxytocin was randomized at the first visit and participants received the opposite nasal spray at the second visit. | Randomized, double blind, placebo-controlled crossover design. fMRI. Participants passively viewed a biological motion paradigm (human motion and scrambled motion) and listened to a vocal affect perception paradigm (angry voices and happy voices). | Biological motion condition: enhanced response in the right posterior superior temporal sulcus (pSTS) after oxytocin compared to placebo administration. Negative vocal affect condition: Enhanced activation in right brainstem and right amygdala after oxytocin versus placebo administration. |
Greene et al. [56] | 28 ASD (2 females, 26 males)
3 puffs per nostril (Syntocinon), each puff contained 4 IU of oxytocin, for a total of 24 IU, or placebo containing the same inactive ingredients. Nostrils were alternated between puffs over the course of several minutes. Two scan sessions were scheduled at least 72 hours apart from one another. Order of oxytocin and placebo were counter-balanced. | Placebo-controlled double-blind design. fMRI. Participants completed an incentive delay task with nonsocial (money) or social rewards (smiling face). | Anticipation of nonsocial reward: Increased activity in right nucleus accumbens (NAcc), right frontal pole, left ACC, left superior frontal cortex, bilateral orbital frontal cortex (OFC) after oxytocin versus placebo administration. Increased functional connectivity during nonsocial reward anticipation (between the right NAcc and the right FP) after oxytocin versus placebo. Nonsocial reward outcome: Decreased frontostriatal functional connectivity between left ACC, bilateral postcentral gyrus, left inferior front gyrus, left precentral gyrus, and left medial frontal gyrus after oxytocin vs placebo administration. |
Neuroscience results after oxytocin administration in children with ASD.
Gordon and colleagues [54] used functional magnetic resonance imaging (fMRI) to measure brain activity after oxytocin versus placebo in 17 children and adolescents with ASD (ages 8-16.5) using a randomized, double-blind, crossover design. Forty-five minutes after administration of either oxytocin or placebo, participants completed an fMRI emotion recognition task based on the RMET [33]. In a control fMRI condition, participants were asked to label the category of automobile presented in pictures. Findings suggested enhanced brain activity after oxytocin administration in brain areas hypothesized to be critical to reward (dorsal and ventral striatum), social attention and cognition (posterior cingulate, inferior parietal lobule, posterior superior temporal sulcus), and reasoning about mental states (medial prefrontal cortex). In addition, several brain regions were less active during nonsocial judgements after oxytocin administration. Interestingly, the effect of oxytocin on brain activity in response to social judgements differed as a function of symptom severity. Children with ASD with less severe symptoms (measured with the SRS) exhibited more ‘typical’ brain activity after oxytocin administration compared to children with ASD with more severe symptoms. Taken together, the authors hypothesized that oxytocin may increase the reward value and/or salience of social stimuli for children with ASD while simultaneously decreasing the salience of nonsocial information.
Gordon and colleagues [55] employed a randomized, double-blind, placebo-controlled crossover design with 20 children with ASD (ages 8-16.5). Participants completed an fMRI scan twice: once receiving oxytocin and the other after receiving placebo nasal spray. The authors measured participants’ brain activity in response to two social perception tasks: a biological motion task and an affective voices task. The authors’ primary aim was to measure whether oxytocin increased brain activity in areas related to the reward system and the connections between reward and social brain regions (e.g. mesocorticolimbic pathways and communication between this pathway and socially-relevant brain regions) compared to placebo. Results were consistent with the author’s hypotheses: oxytocin enhanced neural responses to biological versus random motion in the posterior superior temporal sulcus (pSTS), and in the amygdala and hippocampus in response to angry versus happy voices. Across both fMRI tasks, oxytocin increased neural connectivity both within reward regions and between the reward pathway and regions associated with social perception. The authors concluded that oxytocin administration appeared to enhance salience/reward of social stimuli (as measured in the biological motion task), but also increased the salience of negative social stimuli (as measured by the affective voices task).
Greene and colleagues [56] conducted a placebo-controlled, double-blind study with 28 children and adolescents with ASD (ages 10-17). Participants completed an fMRI incentive delay task on two occasions: once after receiving oxytocin, and once after receiving a placebo nasal spray. The fMRI task involved both social and non-social reward conditions so the authors could compare the effects of oxytocin versus placebo on brain activity related to both social and nonsocial rewards. Results demonstrated that compared to placebo, oxytocin increased brain activity in the caudate nucleus, left anterior cingulate cortex, frontal pole, insular cortex, and orbito-frontal cortex in the nonsocial reward versus social reward condition. Additionally, the authors found a positive relationship between symptom severity (measured using the SRS; [37]) and activation in the frontal pole and anterior cingulate during nonsocial reward anticipation, and between symptom severity and activation in the precentral gyrus and left caudate during nonsocial reward processing. Interestingly, these findings do not support the hypothesis that oxytocin selectively enhances reward-related brain activity to social stimuli, but rather may be associated with increased reward anticipation and processing for nonsocial stimuli. The authors hypothesize that reward-related effects of oxytocin may be sensitive to task-specific features, and noted that their findings strengthen the body of evidence that oxytocin acts on the brain’s reward system.
Taken together, these findings provide further evidence that intranasal oxytocin administration appears to act on the neural reward system. However, evidence is mixed regarding whether oxytocin specifically acts on the social reward system [54, 55] or the reward system more broadly [56]. It is likely that differences in neuroscience tasks, as well as differences in regions of interest, and participant sample characteristics may explain disparate findings. Importantly for our theoretical framework, intranasal oxytocin administration appears to impact the reward system in children with ASD. This provides an empirical basis for our hypothesis that combining a pharmacological agent with behavioral interventions that act on similar brain regions/networks may improve outcomes related to social initiation and communication.
Given the heterogeneous behavioral manifestations of ASD, it is not surprising that multiple behavioral interventions have been developed to improve social communication and decrease challenging behaviors [58, 59, 60]. Multiple systematic reviews have been published on the success of behavioral interventions for children with ASD (e.g. [61, 62, 63, 64]), and an extensive review is beyond the scope of the current chapter. Of primary relevance to the current chapter are behavioral interventions designed to increase the salience, relevance, and reward value of social interactions in order to improve social-communicative symptoms.
This section will briefly review two of these behavioral interventions, specifically the Early Start Denver Model (ESDM) and Pivotal Response Training (PRT) as both of these interventions are based on principles of Applied Behavioral Analysis (ABA) but emphasize naturalistic teaching strategies to promote generalization. Note, however, that there are other naturalistic interventions grounded in ABA principles (e.g. Incidental Teaching [65]; Reciprocal Imitation Training, or RIT [66, 67]; Parent-training programs, such as Project ImPACT [68]; Joint attention Interventions, such as JASPER [69, 70], and others).
ESDM is an empirically validated, manualized intensive early intervention program designed for children between the ages of 1-4 [60, 71]. ESDM uses teaching strategies including: interpersonal exchange and positive affect, engagement with real-world activities and materials, adult responsivity and sensitivity, and focus on both verbal and nonverbal communication. These strategies are grounded in ABA principles including operant conditioning, shaping, and chaining. Importantly, ESDM is not conceptualized as a behavioral intervention that must occur in a table-top or structured situation, nor is it a “one size fits all” approach. Each child’s program is individualized, and parent’s roles are emphasized. Parents are taught ESDM strategies and encouraged to utilize them during daily activities (e.g. feeding, bath time, play). In a 2010 randomized controlled trial, Dawson and colleagues compared the efficacy of ESDM versus treatment as usual (TAU) over a 2-year period [60]. Results found significant improvements in cognitive abilities in the ESDM group compared to TAU. These group differences appeared driven by improvements in both expressive and receptive language in the ESDM group. Additionally, significant group differences were observed in adaptive behaviors. Whereas children in the ESDM group remained steady in their adaptive behaviors across time, children in the TAU group exhibited lower scores across time when compared to their neurotypical peers. This difference appeared driven by increasing gaps between the TAU group and their neurotypical peers in a variety of adaptive skills, whereas children in the ESDM group displayed improvement in their communication abilities. A recent meta-analysis corroborates the efficacy of ESDM in improving cognition and language for children with ASD [72].
Pivotal response training (PRT), sometimes referred to as Pivotal Response Teaching or Pivotal Response Therapy, is a naturalistic behavior intervention based on principles of ABA. The underlying assumption of PRT is that children’s challenges can be improved with behavioral and environmental manipulations including reinforcement, contingencies, consequences, and extinction [73]. The term “pivotal” is important as it refers to pivotal behaviors that, when targeted, can lead to improvements in other areas of behavior not specifically targeted. The behaviors/function areas most commonly targeted in PRT are: motivation, initiation, responding to multiple cues, and self-management [74, 75]. To increase motivation, teaching strategies include: following the child’s lead, offering choices, providing clear opportunities for response, varying tasks, including both maintenance and acquisition tasks, contingent and natural reinforcement, and reinforcing all attempts at target skills [73, 74]. Similar to ESDM, PRT emphasizes the importance of implementing the intervention in the child’s natural environment and the involvement of parents and other caregivers in the intervention [73]. Results of a systematic review indicate that PRT is largely effective at increasing self-initiation and improving language, communication, and play skills in children with ASD [76]. A 2016 meta-analysis concluded that PRT is effective at teaching behaviors to children with ASD [77].
Despite a wealth of research examining the behavioral utility of empirically-based interventions for children with ASD, there is a relative paucity of literature utilizing neuroscience as an outcome measure or predictor of behavioral intervention response (see [78] for a review). To our knowledge, seven studies have been published using neuroscience as either an outcome measure or predictor of response for an empirically supported behavioral intervention designed to help with core symptoms of ASD. See Table 3.
Authors | Participants | Intervention, Neuroscience Methodology, & Task | Neuroscientific Findings |
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Dawson et al. [79] | 15 ASD in ESDM group
| ESDM; 2 for years; 20 hours/week ERP Participants viewed images of faces and toys. | Faster Nc and increased cortical activation to faces vs. objects in the EDSM group. Faster Nc and increased cortical activation to objects vs. faces in the TAU group. |
Voos et al. [80] | 2 ASD (1 male, 1 female), each 5 years old | PRT; 16 weeks; 8– 10 hours/week fMRI Participants viewed biological motion clips and scrambled motion clips. | During biological motion: Participant 1 (female): Increased activity in the fusiform gyrus (FG) and dorsolateral prefrontal cortex (dlPFC). Participant 2 (male): Increased activity in the posterior superior temporal sulcus (pSTS), ventrolateral prefrontal cortex (vlPFC), and FG. |
Ventola et al. [82] | 10 ASD (8 male, 2 female) Hypoactive group (3 male, 2 female):
| PRT; 16 weeks; 7 hours/week fMRI Participants viewed biological motion clips and scrambled motion clips. | During biological motion: Initially hypoactive group: increased activation in the ventral striatum (VS) and right posterior superior temporal sulcus (pSTS) Initially hyperactive group: decreased activation in right pSTS, amygdala, thalamus, and hippocampus. |
Van Hecke et al. [83] | 28 ASD in the immediate treatment group (22 male, 6 female)
| PEERS; 14 weeks; 1.5 hours/week EEG Continuous resting EEG | Immediate treatment: Increased left-dominant gamma asymmetry during resting state EEG after intervention vs. pre-intervention (more similar to TD). WLC: no change. |
Venkataraman et al. [88] | 19 ASD (13 males, 6 females)
| PRT; 16 weeks; 7 hours/week fMRI Participants viewed biological motion clips and scrambled motion clips. | During biological motion, reduction in connectivity between the posterior cingulate cortex (PCC) and orbital frontal cortex and an increase in connectivity between the PCC and regions of ventral occipital temporal extrastriate cortex. |
Yang et al. [89] | 20 ASD (13 male, 7 female)
| PRT; 16 weeks; 7 hours/week fMRI Participants viewed biological motion clips and scrambled motion clips. | Pre-intervention brain activity in the following areas while viewing biological motion predicted behavioral improvements on the SRS from pre- to post-intervention. (1) social perception (fusiform gyrus, inferior temporal gyrus, middle temporal gyrus), (2) social attention (inferior parietal gyrus, superior parietal lobule), (3) emotion regulation and reward (orbitofrontal cortex, ventrolateral prefrontal cortex, anterior insula), and (4) social reward (putamen, pallidum, amygdala, hippocampus, ventral striatum) |
Baker et al., [90] | 7 ASD (6 male, 1 female)
| PEERS; 16 weeks; 1.5 hours/week ERP Participants completed a reward task with feedback that was social (face) or nonsocial (arrow) with correct or incorrect feedback (face: smile vs frown; arrow: upward vs downward). | Increased neural sensitivity to both social and nonsocial rewards (RewP amplitude) after versus before intervention. |
Neuroscience outcome measures of behavioral interventions in children with ASD.
The first published paper using neuroscience as an outcome measure was Dawson and colleagues in 2012 [79]. 29 children with ASD (ages 48-77 months) participated in the study and were randomly assigned to either receive two years of ESDM intervention or two years of treatment as usual, TAU. Compared to toddlers in the community intervention, those who received ESDM demonstrated faster neural signatures of attention (the Nc ERP component) when viewing faces versus objects. Interestingly, when brain activity patterns of the two groups of toddlers with ASD were compared to brain activity of neurotypical (TD) toddlers, the ESDM and TD groups exhibited increased cortical activation when viewing faces versus objects, whereas toddlers in the TAU group evidenced more cortical activation when viewing objects vs. faces. The authors concluded that participation in ESDM appeared to lead to “normalization” of attention to faces. However, the authors did not include measures of brain activity prior to intervention, so they were unable to directly infer whether participation in ESDM significantly changed brain activity from pre to post intervention.
Voos and colleagues [80] used fMRI to measure brain activity in two five-year-olds with ASD before and after four months of PRT. The fMRI paradigm involved watching point-light displays that were either attached to an adult who performed actions (e.g. biological motion) or scrambled light displays created with random selections of light points (scrambled motion). When measuring brain activity from brain areas implicated in ASD from previous research [81], the authors found that one participant had increased brain activity after intervention in the left fusiform gyrus and left dorsal prefrontal cortex, and the other participant had greater activation in the left ventrolateral prefrontal cortex, right posterior superior temporal sulcus, and fusiform gyrus. All of these brain regions have been previously implicated as relevant to processing social stimuli and biological motion. Despite the small sample size, the results suggest that PRT can increase brain activity in important regions associated with social stimuli.
Ventola and colleagues [82] also measured brain activity before and after participation in PRT. 10 children with ASD (aged 4-7) completed an fMRI biological motion task both before and after 16 weeks of PRT. 5 neurotypical children were tested twice (once at “baseline” and once 16 weeks later) but they did not receive PRT. Based on activity in the parietal temporal sulcus (pSTS) at baseline compared to neurotypical participants, children with ASD were separated into two groups: hypo- and hyper-active. Children with hypo-activation were hypothesized to have decreased social motivation (evidenced by hypoactivity in the pSTS compared to neurotypical children), and children with hyper-activation were hypothesized to be hypersensitive to stimuli (evidenced by hyperactivity in the pSTS compared to neurotypical children). After PRT, children in the hypo-active group had increased brain activity in the pSTS and ventral striatum when viewing biological motion, and decreased ventral striatum activity in response to scrambled motion. Children in the hyperactive group evidenced decreased brain activity in the pSTS, amygdala, thalamus, and hippocampus when viewing biological motion. The authors’ hypothesized that participation in PRT differentially affected brain activity of children depending on their baseline characteristics (e.g. children who displayed too little brain activity in response to social stimuli evidenced increased brain activity after intervention, whereas children who displayed too much brain activity in response to social stimuli evidenced decreased activity after intervention).
Van Hecke and colleagues [83] used electrophysiology (EEG) to measure brain activity before and after participation in a randomized control trial of the Program for the Education and Enrichment of Relational Skills (PEERS; [84, 85]) versus a waitlist control (WLC) condition. PEERS is an empirically validated, manualized program which focuses on making and keeping friends for adolescents with ASD [86]. 35 adolescents (13-14 years old) with ASD were randomly assigned to receive PEERS, 31 were randomly assigned to WLC, and 30 neurotypical (TD) adolescents were assessed prior to the intervention for comparison purposes. The authors measured brain activity patterns during “resting state” during which adolescents were instructed to focus on a fixation point for three minutes. Of particular interest was patterns of brain activity in the right versus left hemispheres as previous research suggests that individuals who have left-hemisphere dominance have higher approach motivation and positive affect compared to those with right-hemisphere dominance who are often characterized as withdrawn [87]. Prior to intervention, the two groups of teens with ASD evidenced less left-dominant asymmetry compared to the TD group. When comparing post-intervention brain activity of teens who received PEERS to brain activity in the TD group, differences in left-hemispheric dominance were no longer observed. Differences between the WLC group and the TD group were still observed after the 14-week intervention period (during which the WLC group did not receive intervention). These findings suggest that participation in PEERS (compared to a waitlist condition) significantly changed patterns of brain activity to be increasingly left-hemisphere dominant, which is more similar to patterns observed in neurotypical teens.
Venkataraman and colleagues [88] used a Bayesian probabilistic model to characterize fMRI activity in 19 children with ASD (mean age 5.87 years) before and after 16 weeks of PRT. Similar to Ventola et al. [82], the fMRI paradigm involved watching two types of light displays: biological motion and scrambled motion. The probabilistic model allowed the authors to measure PRT-induced changes in neural connectivity between neural regions of interest. Results indicated both reduced connectivity between the posterior cingulate cortex (PCC) and orbitofrontal cortex and increased connectivity between the PCC and areas of the ventral occipital temporal extrastriate cortex. These results are interesting given that the PCC is known for its role in social cognitive processes, the orbitofrontal cortex has been implicated in reward processes, and the ventral occipital and temporal cortices play a role in processing socially meaningful stimuli (including biological motion). These findings suggest that PRT causes a shift, in which connectivity between the PCC and orbitofrontal cortex is decreased while PCC and the ventral occipital-temporal cortex connection is strengthened.
Yang and colleagues [89] utilized fMRI as a pre-intervention predictor of intervention response in 20 children with ASD (mean age 5.90 years). The authors measured brain activity during a biological motion paradigm prior to 16 weeks of PRT. Results demonstrated that pre-intervention brain activity in areas implicated in: (1) social perception (fusiform gyrus, inferior temporal gyrus, middle temporal gyrus), (2) social attention (inferior parietal gyrus, superior parietal lobule), (3) emotion regulation and reward (orbitofrontal cortex, ventrolateral prefrontal cortex, anterior insula), and (4) social reward (putamen, pallidum, amygdala, hippocampus, ventral striatum) while viewing biological motion predicted behavioral improvements on the SRS from pre- to post-intervention. For all 4 regions, greater levels of pre-intervention brain activity were associated with increased behavioral improvements from pre- to post- intervention. Results from this study suggest that neuroscience methods may be able to predict which children are most likely to benefit from a specific intervention, as well as underscoring the importance of brain regions associated with social perception, emotion regulation, and reward for understanding how interventions may affect brain circuitry in ASD.
Baker and colleagues [90] used event-related potentials (ERP) to measure brain response to reward in ASD adolescents before and after participation in the PEERS program compared to a typically developing sample. Response to social and nonsocial rewards were measured using the reward-related positive component (RewP) in seven adolescents with ASD and seven TD adolescents, aged 10 to 17 years. Prior to intervention, patterns of reward-related brain activity (RewP mean amplitude) did not differ between groups. However, after intervention the ASD group demonstrated an enhanced sensitivity to rewards, regardless of social or nonsocial condition, compared to the TD group. Additionally, ASD participants with less robust responses to social rewards prior to the start of the PEERS intervention demonstrated the most gains in social behaviors (as measured via SRS-2 [91]; Social Skills Improvement System, [92]. Findings from this study suggest an enhancement of the neural response to rewards after teens with ASD receive training in social skills and additionally that teens with attenuated responses to social rewards may gain the most benefit from intervention.
Taken together, these seven studies provide evidence for two critical concepts: (1)
Although there are no published studies (to our knowledge) that have conducted double-blind, placebo-controlled trials combining oxytocin administration with an empirically validated behavioral intervention in ASD, two trials are currently underway and recorded on ClinicalTrials.Gov (identifiers NCT02918864 and NCT03370510). We also note that a large-scale multi-site trial of the behavioral effects of oxytocin versus placebo is underway by the Study of Oxytocin in Autism to Improve Reciprocal Social Behaviors (SOARS-B; clinical trial identifier NCT01944046). One paper describing the rationale and methods for the trial has been published [93].
As noted above, we hypothesize that empirically based behavioral interventions designed to increase social-communication skills such as social initiation/motivation are more likely to be enhanced by oxytocin administration than interventions focused on other aspects of ASD (e.g. disruptive behaviors, anxiety). Such interventions are typically aimed towards young children (i.e. ESDM was developed for children ages 1-4) due to the targeted skills. We hypothesize that age is likely to play an important role in the efficacy of combining oxytocin with behavioral interventions such that younger children are more likely to benefit due to: (a) Early interventions in ASD often focus on improving social motivation and initiation, whereas interventions for older children are less likely to have such an emphasis. As oxytocin has been shown to affect the reward system, behavioral interventions designed to increase the reward value of social stimuli are likely to be the best candidates for this framework. (b) Increased neural plasticity in younger ages and the negative neuro-developmental sequelae described in the social motivation hypothesis. That is, young children have been hypothesized to benefit more from early intervention for ASD compared to older children due to neural plasticity, and the social motivation hypothesis posits that decreased reward value of social stimuli early in life leads to a negative cascade of developmental consequences [5, 94]. It therefore seems likely that younger children are best positioned to benefit from combining behavioral intervention with oxytocin because early interventions may disrupt this negative developmental cascade and help children move back towards a typical trajectory. (c) Accumulating evidence that interventions for ASD are likely to be more effective if started earlier in life [94, 95, 96]. It is unclear, however, exactly how age will affect our theoretical model. Future research should pay close attention to how and if age is a predictor when measuring outcomes of combining oxytocin and behavioral intervention in ASD.
Taken together, considering extant research findings from behavioral and neural effects of oxytocin administration along with those on brain activity in response to behavioral interventions in children with ASD suggests that both oxytocin and behavioral interventions lead to measurable changes in regions of the “social brain” and reward network. These findings, combined with those suggesting that oxytocin administration may improve social-communication in children with ASD, provide the empirical basis of our hypothesis [57] that combining oxytocin administration with behavioral interventions may improve outcomes related to social-communication. We hypothesize that the administration of oxytocin prior to each session of an intervention may “prime” the neural reward system to be maximally responsive to the behavioral skills taught during the intervention session. Due to the central role of the reward system in our theoretical model we hypothesize that this combined approach may be most effective for social-communicative skills requiring social motivation (e.g. social initiation/approach) and be maximally beneficial for young children. See Figure 1 for hypothesized neural mechanisms underlying the efficacy of combining interventions with oxytocin to improve outcomes.
It is important to note, however, that this approach is unlikely to be equally effective in all children with ASD. As with all interventions, there does not appear to be any “one size fits all” approach to help children with ASD. It will be critical to measure and characterize individual differences that may explain variability in treatment efficacy from
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