\r\n\tThis edited volume will contain chapters dealing with the different aspects of basic and applied chemical ecology. Scientists working in diverse fields of chemical ecology would contribute high impact articles on chemical ecology and semiochemistry of plants and animals. This book aims to be a rich source of information for the students, teachers and researchers working in this special field of ecological science.
",isbn:null,printIsbn:"979-953-307-X-X",pdfIsbn:null,doi:null,price:0,priceEur:null,priceUsd:null,slug:null,numberOfPages:0,isOpenForSubmission:!1,hash:"b0e57b577bb258d8d3290e46066153b1",bookSignature:"Prof. Sajal Ray",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/6901.jpg",keywords:"Kairomone, Terpenes, Hexadecene, Sex Pheromones, Chemical Defense, Floral Scent Compound, Bisabolene, Linalool, Macrocyclic Lactone, Pinene, Terpinolene, Tritrophic Interaction",numberOfDownloads:null,numberOfWosCitations:0,numberOfCrossrefCitations:0,numberOfDimensionsCitations:0,numberOfTotalCitations:0,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"April 16th 2019",dateEndSecondStepPublish:"May 7th 2019",dateEndThirdStepPublish:"July 6th 2019",dateEndFourthStepPublish:"September 24th 2019",dateEndFifthStepPublish:"November 23rd 2019",remainingDaysToSecondStep:"7 months",secondStepPassed:!0,currentStepOfPublishingProcess:5,editedByType:null,kuFlag:!1,editors:[{id:"173697",title:"Prof.",name:"Sajal",middleName:null,surname:"Ray",slug:"sajal-ray",fullName:"Sajal Ray",profilePictureURL:"https://mts.intechopen.com/storage/users/173697/images/system/173697.jpeg",biography:"Sajal Ray received his MSc and MPhil degrees from Calcutta University in Zoology and Environmental Science respectively and was awarded Ph.D. from Jadavpur University.\r\nHis thesis reported immunotoxicity of pesticide in an economically important snail of India. As an awardee of Fogarty Visiting Fellowship, Dr. Ray carried out his postdoctoral research in Cardiac pathology at National Institutes of Health, USA. \r\nHis research interest is studying the immunological responses of mollusks, sponge, crab, and earthworm exposed to pollutants. \r\nHis team is engaged in understanding the evolutionary mechanism of immunity in phylogeny. He presented his research at various conferences including the World Congress of Malacology at Washington D.C. Sajal Ray, currently, a Professor of Zoology at Calcutta University has been teaching Zoology for nearly thirty years at postgraduate level.",institutionString:"University of Calcutta",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"3",totalChapterViews:"0",totalEditedBooks:"4",institution:{name:"University of Calcutta",institutionURL:null,country:{name:"India"}}}],coeditorOne:null,coeditorTwo:null,coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"6",title:"Biochemistry, Genetics and Molecular Biology",slug:"biochemistry-genetics-and-molecular-biology"}],chapters:null,productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"},personalPublishingAssistant:{id:"177731",firstName:"Dajana",lastName:"Pemac",middleName:null,title:"Ms.",imageUrl:"https://mts.intechopen.com/storage/users/177731/images/4726_n.jpg",email:"dajana@intechopen.com",biography:"As an Author Service Manager my responsibilities include monitoring and facilitating all publishing activities for authors and editors. From chapter submission and review, to approval and revision, copyediting and design, until final publication, I work closely with authors and editors to ensure a simple and easy publishing process. I maintain constant and effective communication with authors, editors and reviewers, which allows for a level of personal support that enables contributors to fully commit and concentrate on the chapters they are writing, editing, or reviewing. I assist authors in the preparation of their full chapter submissions and track important deadlines and ensure they are met. I help to coordinate internal processes such as linguistic review, and monitor the technical aspects of the process. As an ASM I am also involved in the acquisition of editors. Whether that be identifying an exceptional author and proposing an editorship collaboration, or contacting researchers who would like the opportunity to work with IntechOpen, I establish and help manage author and editor acquisition and contact."}},relatedBooks:[{type:"book",id:"6883",title:"Cell Signalling",subtitle:"Thermodynamics and Molecular Control",isOpenForSubmission:!1,hash:"e4e17d85c0643c7f4d274fa9adbcc628",slug:"cell-signalling-thermodynamics-and-molecular-control",bookSignature:"Sajal Ray",coverURL:"https://cdn.intechopen.com/books/images_new/6883.jpg",editedByType:"Edited by",editors:[{id:"173697",title:"Prof.",name:"Sajal",surname:"Ray",slug:"sajal-ray",fullName:"Sajal Ray"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"6559",title:"Earthworms",subtitle:"The Ecological Engineers of Soil",isOpenForSubmission:!1,hash:"0780208898e98441ccea18ea373c0708",slug:"earthworms-the-ecological-engineers-of-soil",bookSignature:"Sajal 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by",editors:[{id:"19816",title:"Prof.",name:"Alexander",surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"4816",title:"Face Recognition",subtitle:null,isOpenForSubmission:!1,hash:"146063b5359146b7718ea86bad47c8eb",slug:"face_recognition",bookSignature:"Kresimir Delac and Mislav Grgic",coverURL:"https://cdn.intechopen.com/books/images_new/4816.jpg",editedByType:"Edited by",editors:[{id:"528",title:"Dr.",name:"Kresimir",surname:"Delac",slug:"kresimir-delac",fullName:"Kresimir Delac"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},chapter:{item:{type:"chapter",id:"65209",title:"Pico- and Femtosecond Laser Micromachining for Surface Texturing",doi:"10.5772/intechopen.83741",slug:"pico-and-femtosecond-laser-micromachining-for-surface-texturing",body:'\nThe laser technology for manufacturing is classified into two categories; e.g., thermal and athermal processings [1]. CO2-laser with continuous power supply and fiber-lasers with use of short pulses are typical processing for welding, machining, and joining by formation of thermally hot spots [2]. Various fiber lasers [3] have been developed and applied to laser welding, laser machining, laser marking, and so on [3]. Most of them utilize the nanosecond solid-state oscillators and make thermal machining of materials. In recent, pico- and femtosecond laser machining [4, 5, 6] is widely utilized for athermal removal of materials with high dimensional accuracy in practice.
\nThere are two keywords to classify the laser processing; i.e., the wave length of light and the pulse duration time. CO2 laser has the longest wave length of 10.6 μm, while excimer laser by KrF, 248 nm. Most of laser wave length (λ) ranges from the far ultra-violet regime less than 200 nm to infra-red regime more than 20 μm. Since every material has its own relaxation rime (τ0), most of laser power can be absorbed by the material having the equivalent τ0 to λ. Then, this targeting work material is athermally machined by selecting the laser with suitable wave length; otherwise, the work is only thermally cut or drilled. A micromachining essentially requires for fast-rate removal of materials with sufficient accuracy in dimension and geometry; the repetition frequency as well as the wave length must be optimally selected to make suitable laser micromachining to each work-material. With use of second harmonic generator (SHG), third harmonic generator (THG), and forth harmonic generator (FHG), the fundamental wavelength of 1064 nm is controllable to be 532, 355 and 266 nm, respectively.
\nThe pulse duration time (Δt) is important for short-pulse laser micromachining. As shown in Figure 1a, the pulse power increases significantly with reduction of Δt. When the laser energy with Δt = 1 ms is 1 mJ, the laser power (P) is only 1 W; P reaches to 1 GW only by shortening Δt down to 1 ps.
\nTypical characteristics of ultra-short pulse laser machining. (a) Significant increase of laser power by reduction of Δt down to 1 ps, (b) ablation as an athermal removal of materials, and (c) laser intensity profile.
Under high power laser irradiation, most of materials are athermally removed, or, ablazed, as depicted in Figure 1b. The dimensional accuracy in laser micromachining is determined by focusing the laser spot for this ablation process. This laser irradiation has a finite spot size which is dependent on λ and Δt. The laser intensity distributes even in the focused spot; e.g., the well-controlled laser intensity distributes in Gaussian profile as depicted in Figure 1c.
\nIn the following, our developing ultrashort pulse laser machining systems are employed to make microdrilling and microtexturing into various kinds of work materials. In particular, the laser microtexturing technology is applied to microjoining process of dissimilar polymers, and to microdimple formation for friction control of sliding parts and components and for reservoir of wear debris during dry cutting. Further applications including the surface property control by using the nano-/microtexturing are discussed in this chapter.
\nOur developed pico- and femtosecond laser machining systems are stated with some comments on their capacity and configuration.
\nA single picosecond is equivalent to the relaxation time of molecular bonding stage; its pulsed power is readily absorbed by most of work materials. Three types of picosecond laser machining systems were developed; a standard system and its configuration are shown in Figure 2. The machining speed is dependent on the repletion frequency and average power. The dimensional accuracy in machining is determined by the beam spot size. To be discussed later, this spot size depends on the optical system; e.g., the minimum spot size can be controlled down to 1 μm when every lens is fixed on the stage. However, when the lens position is controlled during machining, the spot size becomes wider; e.g., it is limited by 10 μm when using the galvanometer.
\nOur developed picosecond laser machining system and its capacity and configuration.
A single femtosecond or subpicosecond lasers are developed for innovative research and development; most industrial applications stand on this laser machining in the order of 100 femtoseconds. Our developed system and its configuration are shown in Figure 3.
\nOur developed femtosecond laser machining system and its capacity and configuration.
Since the focused spot of work materials is subjected to ultra-high power irradiation, how to scan the beam spot becomes more important when using this laser machining system. Higher repetition frequency of laser beams as well as higher scanning speed result in fast-rate dimensionally accurate machining. At present, a laser oscillator with the repetition frequency of 40 MHz has been already developed for machining. How to make fast control of this short pulse laser becomes an essential issue in laser machining design.
\nIn parallel with the development of laser oscillators and machining unit, the optical unit design is also important for accurate laser machining. Two unit designs are introduced in Figure 4; e.g., an optical control unit with use of galvanometer to distribute the laser beam as designed, and a beam rotator for laser drilling with accurate circularity. The former unit is a standard approach for laser machining with moderate rate; new controller must be developed to make much faster rate laser machining. The latter is a powerful tool to rotate the optical units and to move the laser beam in the axisymmetric manner.
\nTypical two optical control units for laser micromachining. (a) Optical control unit with use of galvanometer and (b) beam rotator.
Various controlling tools of laser beam can be designed and developed for each application of laser machining.
\nThese pico- and femtoseconds with the pulse duration in the order of 10−12 and 10−15 s provide a reliable means to drill the through-holes into the ceramics, the metallic alloys, and the plastics [7]. Compared to the micromilling and the microelectrical discharge machining (micro-EDM), finer through-holes with higher circularity are formed without residuals at the inlet of holes and without deterioration on their inner surfaces [8]. In addition, no micromilling tools and no thin EDM wires are needed to drill the lots of through-holes onto the relatively large area. In this laser drilling process, the surface quality of through-holes as well as their circularity is strongly dependent on the laser beam control, as summarized in [9]. In the conventional fiber-laser machining, the inlet of through-holes is deteriorated by the redeposits and the residuals [10]. Even when using the picosecond pulse lasers, the through-hole shape is also damaged by the unstable laser beams [11, 12]. Typical damage of through-holes comes from the branching from the straight hole drilled in the initial stage to two holes. The deviation of beam focusing and positioning directly induces these defects [7, 8, 13]. Our developed picosecond laser machining system for industrial applications is applied to drill the through-holes into the ceramic plates. The beam rotator is used as a trepanning system for laser drilling. The alumina plate with the thickness of 1 mm is employed as a substrate. Scanning electron microscopy (SEM) is used to measure the diameter of through-holes as well as their aspect ratio. The replica method is also utilized to describe the geometric alignment and homogeneity of through-holes. The drilled through-holes with the uniform diameter of 50 μm and the aspect ratio of 10.0 are accurately aligned into the alumina plate. The present trepanning device works to control the diameter of irradiation for fine drilling of the tapered and inversely tapered through-holes into steels.
\nThe alumina plate is prepared for the laser drilling under the experimental setup in Figure 5. The beam rotator as well as projection lens unit is utilized to improve the focused beam quality. Through the CCD and display, the microdrilling process is monitored during operation.
\nA typical experimental setup for laser microdrilling.
Let us first evaluate on the difference of drilling behavior between the fiber lasers and the picosecond laser. The through-hole with the diameter of 50 μm is drilled into alumina plate. When using the normal fiber lasers, the surroundings of hole are completely damaged with deposits on themFigure 6a. While, the accurate hole with circularity of 1 μm is drilled by the picosecond laser without damage and deposits, as shown in Figure 6b.
\nComparison of the drilled through-hole between fiber lasers and the picosecond laser. (a) Fiber laser drilling, and, (b) Picosecond laser drilling.
No residuals or no redeposits at the vicinity of through-hole inlets prove that the present picosecond lase drilling is free from the thermal effects to deteriorate the surface quality of work specimen. The picosecond laser drilling is utilized to fabricate a series of holes with periodically aligned into alumina substrate. Figure 7a depicts the through-holes drilled into the alumina. Each through-hole is aligned with the pitch of 300 μm as programmed by the CAM data mining through the positioning control of beams. As had been discussed in [11], the inner surface quality of through-holes is sensitive to the instability during the laser drilling. Figure 7b also demonstrates that the straight through-hole inner surfaces are formed to have constant diameter without any geometric damages by the picosecond laser drilling. This is because the laser beam is well profiled through the trepanning system before fine control by the galvanometer, and is controlled to move into the depth of work materials. The above straightforwardness of through-holes is also demonstrated by using the replica method. In this method, the silicone-based polymers are infiltrated into each through-hole. The frozen polymers are used as a replica to reproduce the drilled through-hole shape. Figure 7c depicts the alignment of replicas in correspondence to a series of laser-drilled through-holes. Three through-holes were laser-drilled down to the same depth in the alumina plate. Since the first three polymer pillars have the same height as 150 μm, the successive series of through-holes are accurately machined into the alumina with the same depth.
\nPicosecond laser drilling of through-holes into the alumina plate. (a) Alignment of through-holes, (b) inner surface of through-hole with the diameter of 50 μm, and (c) demonstration of the homogeneous laser drilling by using the replica method.
These straight through-holes with high aspect ratio provide a solution to the demand for the probe-cards to make accurate inspection of the semiconductor chips. The probe-pins are pierced through the straight through-holes of alumina or PSZ substrates for inspection. These through-holes must have higher aspect ratio than 10 to preserve the sufficient working space. Figure 8a depicts the through-hole with the diameter of 50 μm machined into the alumina plate with the thickness of 1 mm; the aspect ratio reaches to 20. This high aspect ratio is also attained even when laser drilling PSZ in Figure 8b. This demonstrates that the trepanned laser drilling enables to make through-holes with higher aspect ratio than 20 under the well-structured setup in laser machining.
\nPicosecond laser drilling of through-holes with higher aspect ratio. (a) Drilled through-holes into alumina plate and (b) drilled through-holes into partially stabilized zirconia (PSZ).
In the die and mold industries, the case-hardened and plasma-treated steels are often utilized for high proof of dimensional accuracy. Let us also compare the laser drilling performance between the fiber-lasers and the picosecond laser. Figure 9 compared the drilled through-holes between two lasers. The large heat-affected zones as well as damages surround the drilled hole by fiber laser in Figure 9a. While, the clean and accurate through-hole is drilled into the case-hardened steels by the picosecond laser in Figure 9b.
\nComparison of the drilled through-holes into the case-hardened steels. (a) Using the fiber lasers and (b) using the picosecond laser.
Without use of the beam rotation control, the tapering is difficult or nearly impossible in the laser drilling. In the present setup, the pair of lenses in the beam rotator in Figure 5 is radially adjusted to directly control the diameter of irradiated region. When this diameter is narrowed from the inlet to the outlet with the constant velocity, the uniformly tapered through-hole is drilled to have a constant tapered angle up to the specified positive skew angle. On the other hand, the inversely tapered through-hole is also machined by enlarging this diameter with the constant velocity in the similar way down to the negative skew angle. These tapering or inversely tapering processes from the inlet to outlet of the through-hole are automatically programmed. After CAM data in the present laser drilling, this diameter of irradiation is narrowed from the inlet by 100 μm to the outlet by 30 μm with the constant feeding velocity. Then, the tapered through-hole is built into the alumina plate with the constant angle of +30° and the higher aspect ratio than 10.0 in Figure 10. In the similar way, the inversely tapered through-hole is formed by enlarging the diameter of irradiation from the inlet by 100 μm to the outlet by 180 μm also with the constant velocity. The inversely tapered through-hole is also drilled into the alumina with the thickness of 1 mm. The inversely tapered angles are also constant by −25°. In both cases, the inner surfaces of holes are finely shaped with less roughness [14].
\nPicosecond laser drilling of the tapered and inversely tapered through-holes into the case-hardened steels.
Microtextures with the size in the order of 1–100 μm on the solid surface and interface work to reduce the friction and wear, to assist the joinability, and to functionalize the surfaces and interfaces [15]. Micromilling [16] and microelectrical discharge machining (micro-EDM) [17] have been utilized to make microtexturing onto the steel surfaces. Due to the limitation on the machining tool shape and their controllability for machining, their application is also limited in practice. Short-pulse laser machining is employed to make microtexturing onto the metallic and ceramic surfaces.
\nA circular dimple is formed on the various metallic surfaces as an aligned structure. Figure 11 depicts four microtexturing cases. The unit-geometry of microdimples, their alignment on the surfaces, and the finished surface quality are preserved with less roughing during laser processing. For an example, the circular microdimples with the diameter of 95 μm and the depth of 26 μm are formed on the AISI430 surface in the pitch of 110 μm as shown in Figure 11d. No difference in microdimple size and shape and in its alignment is noticed for various kinds of metallic substrates.
\nLaser microtexturing of circular dimples aligned on the metallic substrates. (a) Aluminum, (b) copper, (c) nickel, and (d) AISI430.
The initial geometric data in CAD and CAM for laser microdimple texturing are data-transformed from positive to negative; this transformed CAD and CAM data are automatically built for laser microemboss formation. In practice, the concave patterning to form the microdimples changes itself to the convex patterning to form the microembosses onto the substrate surfaces. Figure 12 depicts four microembossing cases. The dimensional and geometric accuracies are preserved in the similar manner of microdimple formation. For an example, the circular microembosses with the diameter of 250 μm and the depth of 125 μm are formed on the boron-silicate glass surface in the pitch of 280 μm, as shown in Figure 12d.
\nLaser microembossing of circular embosses aligned on the metallic and ceramic substrates. (a) AISI430, (b) Ni, (c) AISI304, and (d) boron-silicate glass.
With use of femtosecond lasers, finer microtextures are formed as a three-dimensional structure on the metallic surfaces. Figure 13 depicts the three-dimensional microstructures formed on the steel surfaces. In particular, the Gaussian-shaped pillar array with the height of 20 μm and the pitch of 20 μm is machined into the AISI430 substrate as shown in Figure 13c.
\nLaser microtexturing of three-dimensional structures onto the surfaces. (a) AISI410, (b) SISI304, (c) AISI430, and (d) AISI430.
Three-dimensional periodic microstructures have a capability to functionalize the metallic surfaces for optical reflection and diffraction devices and for stamping die and injection mold to transcribe their negative textures onto metallic and polymer sheets. Figure 14 depicts the periodic microstructures formed on the aluminum and AISI304 steel substrates, respectively. Figure 14a is a stepwise terrace structure machined into aluminum with each layer thickness of 5 μm by decreasing the diameter from 450 μm down to 50 μm with the step of 100 μm.
\nLaser microtexturing of fine periodic structures onto the surfaces. (a) Al, (b) AISI304, (c) AISI304, and (d) AISI304.
Two- and three-dimensional microtexturing becomes much important in preparation of mold-dies for mold-stamping of optical elements [18]. The most popular microtexture is a Fresnel pattern for optical lens; circumferential patterns with steep surfaces must be imprinted onto the surface of substrate materials. V-letter-shaped micropatterns are laser-machined onto the glassy carbon substrate to discuss the dimensional accuracy and to investigate the depth profile for different aspect ratio. Furthermore, our developing microstamping system [8, 19, 20] is utilized to duplicate these micropatterns onto optical polymers by using the patterned glassy carbon mold-dies and to discuss the accuracy by this imprinting.
\nIn the two-dimensional microtexturing, a unit pattern like a groove, a dimple, or a wedge is machined with the specified regularity onto the substrate by using X-Y positioning control. Here, a microgroove is employed as a standard unit pattern to fabricate the microtextured mold-die. Glassy carbon (GC) substrate is employed to make V-letter-shaped microgrooving with the pitch of 35 μm, the V-shaped wedge width of 10 μm, and the depth of 10 μm in design. Figure 15a shows the optical micrograph of V-shaped grooving pattern on GC substrate. One groove is laser-machined twice on the same designed machining path. This micropattern is formed onto the GC substrate with the area of 25 × 25 mm2 for 40 min or 2.4 ks. As shown in Figure 15b, a sharp wedge of microgroove is imprinted onto the multilayered GC substrate. The microgroove has 10 μm in width, and 35 μm in pitch. The geometric dimensions specified in CAM program are accurately reproduced in the actual laser microtexturing. The depth profile of V-letter-shaped microgrooves is directly measured to investigate the accuracy of depth in the two-dimensional texturing. Figure 16 depicts the measured depth profile by precise surface profilometer. Deviation of depth ranges from −1 to +2 μm around the average depth of 10 μm. This proves that regular patterns could be machined by the present approach. In order to investigate the controllability of microgrooving in depth, the designed depth parameter is varied with the laser beam power kept constant. Figure 17 compares the relationship between the designed and measured depths in this microgrooving. Up to 20 μm, the average depth of microgrooves is accurately controlled by the present laser machining system.
\nLaser microtexturing of V-letter shaped grooves into GC substrate. (a) Microscopic image of microgrooved GC and (b) SEM image of microgrooves.
Depth profile across the V-letter shaped microgrooves in GC substrate.
Relationship between the designed and measured microgroove depths.
The above microtextured GC substrate is used as a mold-die for warm mold-stamping. PMMA sheet with the thickness of 1 mm is employed as a work material for this mold-stamping just above its glass-transition temperature of 383 K (or 110°C). Figure 18a showed the V-letter-shaped grooving patterns, which are imprinted onto PMMA by the load of 1 kN for 60 s. The V-letter-shaped concave patterns in Figure 15b are accurately imprinted onto PMMA as the convex micropattern as shown in Figure 18b. That is, a series of microwedge fins are fabricated by this mold-stamping with use of microtextured mold in Figure 15. In the mold-stamping, the filling process of work materials into the micropatterns on the mold-die is essential for accurate imprinting. Precise observation with higher magnification in SEM is made to investigate this filling behavior at the initial stage of mold-stamping. Figure 18c depicted a convex bump with the width of 10 μm and the height of 3.5 μm. This bump formation is just the initial stage of filling process for viscous PMMA to infiltrate into the V-letter-shaped groove by mold-stamping. In case of mold-stamping just above the glass transition temperature, viscosity of plastic materials is so high as to reduce the filling velocity. This reflects on the slow shearing along the side faces of microgroove.
\nTranscription of the V-letter wedge microtexture on GC to the V-letter bump microtexture via the mold stamping. (a) Multimicrogrooved PMMA sheet, (b) V-letter bump microtextures on PMMA, and (c) formation of microbump by inclusion of melt PMMA into V-letter wedge on GC mold.
Most of mobile cellular phones are not water-proven so as to be diminished in the accident where those were dropped into water. To be free from these damages, there have been done many efforts to install the perfect waterproof into them [21]; e.g., a silicone rubber ring was sandwiched between plastic cover cases to prevent from water penetration through clearance. This fixture might work well just after shipping; it could be useless at the presence of dirt on the interface or through its misalignment by users in daily use of mobile phones. As the first remedy, a liquid silicone rubber with adhesives is fixed onto their polymer case by the liquid injection molding (LIM) process [22]. Since adhesives invoked in the silicone are responsible for joining, delamination might occur in partial after repetitive opening-and-closing operations in daily use of mobile phones. This difficulty requests us to reconsider the joining process between flexible rubber and hard plastic case in the mobile phone.
\nThe microgrooves are formed into the stainless steel mold for injection molding [23, 24]. Silicone rubber is joined with the polycarbonate plate as a specimen for joining strength test. The measured joining strength is constant by 4 N/mm at the presence of fine microgrooves, where the thinnest silicon rubber fractures without interfacial delamination. This joinability is common to the mobile phone model. The waterproof testing demonstrates that this joined interface has sufficient integrity at high pressure state by 15 kPa.
\nThe picosecond laser microtexturing with use of the galvanometer is employed to form the microgroove textures onto the AISI martensitic stainless steel mold. Figure 19 depicts four microgrooved AISI420 molds with varying widths of 100, 75, 45, and 20 μm, respectively. The groove depth is constant by 10 μm. Each microgroove is shaped to have Gaussian profile irrespectively; the beam intensity profile directly reflects on this microgroove geometry. This mold is inserted into the die-set for injection molding. Polycarbonate (PC) is employed as a work material to imprint these microgroove textures onto the work surface. Figure 20 depicts the transcribed microbump textures onto PC from the microgroove on the AISI420 mold. Both the groove width and pitch are accurately preserved through this injection molding.
\nMicrogroove textures with various widths from 100 to 20 μm and constant depth of 10 μm into AISI420 stainless steel substrate.
Transcription from the microgrooves on the AISI420 mold to the microbumps on the PC specimen.
In the LIM process, adhesive primer is deposited onto the interface before infiltration of silicone melt in the mold-die. Since intermission between two processes is less than 2–3 s, adhesion takes place between silicon and PC-plate under the cooling stage. Figure 21a depicts the PC plate specimen with a silicone square ring after joining in the inside of mold-die during LIM process. In the following test, only the joined section in the width of 80 mm is used for tensile adhesive strength testing. A uniaxial tensile testing system with the dynamic video monitoring is used to measure the loading behavior till the final fracture with in situ observation on the deformation of silicone. As shown in Figure 21b, when the microgroove width is less than the intrinsic microcavity width of 100 μm, the fatal fracture occurs in the tensile silicone rubber without any delamination of interface between PC and silicone. This joining strength reaches 4 N/mm irrespective of the joined length and size even if the microcavities are present on the interface. This implies that microtextures on the joined interface could control the cavitation process to be free from interfacial delamination.
\nJoining strength testing. (a) Microbump textured PC specimen joined with silicone rubber and (b) fatal fracture of silicone without interfacial delamination.
The skewed microgrooves with their width and depth of 20 μm are laser-machined into the AISI420 die insert. In the similar way to preparation for the PC-specimen with the silicone rubber ring, the injection molding is used to transcribe the microgrooves into the PC-cover case; LIM process is also utilized to make in situ joining of silicone rubber ring onto the PC-cover case via the microbump textures on PC. Figure 22 depicts the mobile phone model, fabricated in the above procedure. Each interface between the PC-cover case and silicone rubber has microbump textures. The Hamron leakage testing is employed to perform the waterproof test; e.g., this test aims at the quality check of significant deformation by small leaks under the applied pressure for 5 min. This model is dipped into a water pool, pressurized up to 15 kPa and held for 5 min. As shown in Figure 23, the PC-cover case deforms by pressuring it up to 15 kPa; no further deformation is detected during the holding duration. This demonstrates the perfect waterproof on the jointed interface with aid of microbump textures.
\nA mobile phone PC-model joined with the silicone rubber through the microtexture with the width of 20 mm on the interface.
Waterproof test to demonstrate the integrity of mobile phones under the pressure of 15 kPa.
Superhydrophilicity and superhydrophobicity have grown up as a key surface engineering to keep clean and fresh surface of products and to control the liquid flow on the product surfaces. The oxide-glass lens as well as metallic-glass, optical elements are a typical targeting product to have their surface hydrophilic or superhydrophilic for liquid film formation, and to have it hydrophobic or superhydrophobic for well-defined water repellency [25]. The high energy surface had higher attractive capacity to other material atoms and molecules; those are adherent to each other to form a wet film on the surface. While, the low energy surface had lower attractive capacity to other material atoms and molecules; those are isolated from each other to form the droplets on the surface.
\nThere are two modifications to control this surface state; e.g., the chemical and physical treatments. The chemical treatment is a general tool to modify the surface condition; e.g., fluorine-based coating increases the contact angle up to 130–150° in [26]. On the other hand, the idea of lotus effect has been discussed as a physical approach to form hydrophobic surface [27]. This lotus effect works in nature since the water droplets are supported by the air gap through the fine fibrous lotus leaf; this idea suggests that wettability might be widely controlled by the micro-/nanotexturing [28]. As has been reported in [29, 30, 31], the femtosecond laser micro-/nanotexturing methods have been developed to tune the surface wettability from superhydrophilic to superhydrophobic states. In particular, the micro-/submicro textures are formed on any materials by the laser-induced periodic surface structuring (LIPSS), where the incident and reflected lights have interaction with the scattered and diffracted lights at the vicinity of surface roughness [32]. Among several approaches to design this LIPSS, the authors proposed the micro-/submicrotexturing design by LIPSS with the use of fundamental wavelets and high-frequency ripples [33, 34]. Here, LIPSS is formed onto the AISI304 stainless steel substrates by using the femtosecond laser texturing. Both the superhydrophilic and superhydrophobic surfaces can be formed by the present laser nano-/microtexturing. The geometric effect of surface geometry on the superhydrophobicity is discussed to optimize the laser surface profile control.
\nWith reduction of the pulse duration, the optical interaction with irradiated materials localizes in the wavelength range. When irradiating the materials in the fundamental mode, this interaction field is limited within the submicrometer range. LIPSS is a typical local interaction, occurring at the site of material surface roughness in the order of micrometer. Figure 24 depicts the LIPSS formed on the austenitic stainless steel type 304 by the present femtosecond laser texturing. Nanotexturing alignment angulates itself across the microtexture in Figure 24asince optical interaction is affected by the surface profile in micrometer range. As shown in Figure 24b, the spatial periodicity of these nanotextures is constant by 250 nm. This reveals that fine nanotextures with constant periodicity are formed on the metallic surface by the femtosecond laser treatment.
\nLIPSS formed on AISI304 substrate surface by the present femtosecond laser texturing. (a) Microtextured angulation and nanotextures and (b) fine alignment of nanotextures.
After the classical theory on the surface wettability [35], the hydrophilic or the hydrophobic surfaces are modified to have superhydrophilic or superhydrophobic states, respectively. This is because the geometric item works to decrease the contact angle for hydrophilic surface or to increase it for hydrophobic one. Figure 25 depicts the wettability of nanotextured AISI304 surface by the femtosecond laser surface modification. The measured contact angle reaches down to 8°; it is superhydrophilic. This reveals that the classical theory is true to describe the geometric nanotexture effect on the contact angle when the spatial periodicity of nanotextures works as a major geometric item in surface quality.
\nModification of hydrophilic surface to have superhydrophilic state by laser nanotexturing.
In addition to the nanotexturing surface modification, the microtexturing angulation is taken into account as the geometric item. AISI304 stainless steel sheets with the size of 25 × 25 × 3 mm3 are nano-/microtextured to investigate the change of surface wettability by this processing. Figure 26 compares the droplets swelling on the specimen before and after this micro/submicrolaser texturing. The contact angle of pure water on the bare stainless steels is 70–75°, corresponding to the normal wettability of metals [36]. Through the present texturing, the contact angle increases up to 156°. This proves that nano-/microlaser texturing provides a tool to modify the wettability of stainless steel surfaces from hydrophobic to superhydrophobic state. This finding is completely against the classical theory; if more geometric items are put into laser texturing, the material surface quality can be widely controlled by geometric design.
\nModification of wettability on the AISI304 substrate from the original hydrophilic state to the superhydrophobic one by laser nano-/microtexturing.
There are two geometric items affecting on the surface property; the fractal dimension and the aspect ratio for nanotextures [37]. The former influences on the complexity of surface geometry; the latter, on the local angulation of geometry. Thirty AISI304 stainless steel sheets with the size of 10 × 10 × 0.1 t mm3 are laser nano-/microtextured to investigate the effect of microtexture pitch and height on the measured wettability. Figure 27 describes the relationship between the aspect ratio of nanotexture width to height on the measured contact angle. When this aspect ratio is less than 0.1 or more than 0.3, almost all measured contact angles are less than 155°; the micro-/submicrotextured AISI304 specimens are only hydrophobic. Higher contact angle up to 170° is attained when tuning this aspect ratio between 0.2 and 0.3; e. g., when using the microtextures with the width of 20 μm, their height might well be 2–6 μm. This implies that local angulation of surface geometry has significant influence on the controllability of hydrophobicity.
\nEffect of the longitudinal aspect ratio on the measured contact angle among 30 nano-/microtextured AISI304 substrates.
Under the strong demand for reduction of environmental burdens in manufacturing, every productive line must be energy-saving and highly material-efficient with less emission to environments [38]. In past, the huge amount of lubricating oils has been utilized to reduce the friction and wear not only in automobile industries but also in machining, metal forming, and so on [39]. In order to reduce this amount down to the minimum quantity, the contact surface of mechanical parts and tool surfaces are microtextured to reduce the friction coefficient and wear rate under minimum quantity lubrication (MQL) [40]. Microdimples on the working interfaces and surfaces play as a lubricating oil pocket to form a thin lubricating oil film on the interface between sliding parts and between work materials and tools [41]. The depth profile of each microdimple reflects on the local pressure distribution; this interfacial lubricating film works as a pressure boundary to support the sufficient film thickness to lubrication under MQL [42]. In addition, these microdimples work as a reservoir to store the wear debris of work materials and tool chips during the semidry machining and metal forming [43]. Here, the microdimples are formed by the picosecond laser texturing onto the dies and tools. The pin-on-ball method is employed to evaluate on the reduction of friction for the microdimpled die. The normal milling test is also utilized to describe the effect of microdimpled cutting tool on the reduction of tool wear.
\nThe picosecond laser microtexturing is employed to form the circular microdimples onto the AISI420 stainless steel dies, with the diameter of 50 and 100 μm and the depth of 10 μm in the regular lattice alignment with the pitch of 100 and 200 μm, respectively, for tribotesting. While, the isosceles triangular microdimples with the bottom edge of 155 μm, the height of 80 μm and the depth of 5 μm are machined onto the WC (Co) cutting tools in the zigzag alignment. Figure 28 depicts these microdimpled specimens and tool together with the SEM-image and three-dimensional profile of microdimples.
\nLaser microdimple texturing. (a) Microdimpled stainless steel die and (b) microdimpled WC (Co) cutting tool.
The pin-on-ball testing is employed to measure the time evolution of frictional force under the constant normal load. In this testing, the counter material ball is on contact with the die material under the applied normal weight as depicted in Figure 29. The frictional force is directly measured by load sensor attached to the arm. In the following tests, SUJ2 hard balls are utilized as a counter material. The friction coefficient is calculated by division of the measured friction force to the applied normal load. Figure 30 depicts the transients of friction coefficient with increasing the sliding distance for three die specimens; e.g., a bare AISI420 die without microdimples, and two microdimpled dies with the microdimple diameter (D) of 100 μm and its pitch (p) of 200 μm and with D = 50 μm and p = 100 μm, respectively. In case of bare die, the friction coefficient increases monotonically with sliding distance up to 0.15. When using the microdimpled die with D = 50 μm and p = 100 μm, lower friction coefficient than 0.07 is preserved during this tribotesting.
\nThe ball-on-disc method for measurement of friction coefficient during the sliding conditions.
Variation of the friction coefficient with increasing the sliding distance for three cases; the bare die without microdimples, and the microdimpled dies with D = 100 μm and p = 200 μm and D = 50 μm and p = 100 μm, respectively.
When milling the aluminum alloys by WC (Co) tools, the tool face is inevitably subjected to adhesion of work material. Microtexturing into the tool face enables to reduce this adhesion by storing the wear debris and cutting chips into these pockets on it. In this experiment, AA5052 aluminum alloy is employed as a work material for normal milling with use of the bare WC (Co) and microtextured one as shown in Figure 28b. Figure 31 compares the adhesion process of work material onto the tool face at the milling distance (L) of 900 and 1800 m, respectively, between the bare and microdimpled tools. Without microdimples, the adhesive area and thickness of work materials onto the tool face enlarges with increasing L; e.g., when L = 1800 m, nearly the whole face is covered by these work adhesives with their film thickness of 10 μm around the tool edge. On the other hand, little adhesion to microdimpled face is noted even after milling up to 1800 m. This significant reduction of adhesion by microtexturing comes from the storing mechanism where the wear debris and cutting chips are reserved into each microdimple. This reduction of adhesion influences on the cutting force; e.g., the cutting force becomes relatively insensitive to cutting distance when using these microtextured tools.
\nComparison of work material adhesion to tool face with increasing the milling distance between the bare and microdimpled WC (Co) tools.
Low friction and wear is indispensable for most of automotive parts and manufacturing tools. They have curved surfaces, the friction coefficient of which must be reduced to save the energy waste and to improve the fuel efficiency. In particular, the piston cylinder as well as piston skirt are important sliding-part. Figure 32a shows the microdimpled AISI316L inner surface of cylinder with the size of 30 × 500 μm2 and the depth of 5 μm in the pitch of 1 mm in the circumferential direction and 0.5 mm along the length. This wedge-shaped microdimples improve the fuel efficiency significantly. The AA7075 piston skirt is also microdimpled to have circular dimples with the diameter of 30 μm, the depth of 3 μm and the pitch of 120 μm, respectively, as shown in Figure 32b.
\nMicrotexturing into the inner surfaces of automotive parts. (a) Microtextured piston cylinder and (b) microtextured piston skirt.
The spatial resolution in this laser machining is first discussed to find out the way to improve its dimensional accuracy. Through the practical survey on the micromachining and texturing into curved surfaces, the feasible applications are understood to search for bio-medical laser processing. In particular, future trend of fast-rate laser technologies is discussed for further improvement of micromachining.
\nLaser drilling of circular holes is employed as a benchmark test to discuss the dimensional accuracy of 25 × 25 holes in square structure with the diameter of 30 mm and the pitch of 50 mm, as depicted in Figure 33a. Silicon nitride plate with the thickness of 125 mm is used as a work material. Figure 33b and c shows the X- and Y-deviation maps at the inlet diameter and outlet diameter for 625 holes. Since both maps are nearly coincident to each other, the straightness and circularity are preserved to be within 1/125 μm ~ 0.7°, and within 2 μm, respectively. The spatial resolution of hole diameter is within 2.5 μm in the 2σ-reliability.
\nBenchmark test to investigate the dimensional accuracy in the laser microdrilling. (a) Test-drilling, (b) deviation map, measured at the inlet, and (c) deviation map, measured at the outlet.
Without specially designed jigs and fixtures, both the micromilling and micro-EDM are difficult or nearly impossible to microdrill the holes and grooves. Laser microdrilling has little constraint in the manufacturing setup; it is readily applied to make direct drilling. AISI304 stainless steel pipe with its outer diameter (Dout) of 0.7 mm and its inner diameter (Din) of 0.58 mm is employed as a work to make microdrilling the holes and grooves. Figure 34 shows three microtexturing cases; e.g., a microdrilled pipe, a spiral-grooved pipe, and a laterally grooved pipe. The designed textures can be accommodated to the curved surfaces by this laser microdrilling.
\nMicrotexturing into the metallic tube. (a) Microdrilling of holes with the diameter of 100 μm into a AISI304 stainless steel pipe with Dout = 0.7 mm and Dιν = 0.58 mm, (b) microgrooving of shallow grooves with the width of 25 μm and the depth of 3 μm into the same pipe as (a), and (c) microgrooving of lateral grooves with the depth of 30 μm into the same pipe as (a).
Another feature of laser microtexturing is developed by changing the beam control. A thin spring is structured from a pipe in Figure 35a. A wide slit is structured into a pipe as depicted in Figure 35b. Any shaped short-cuts are equipped into a pipe as shown in Figure 35c. This suggests that complex microstructure can be built in the micromachine and micromember.
\nFabrication of the geometrically functionalized parts by laser microtexturing. (a) Structuring a spring with the pitch of 150 μm from thin brass pipe with Dout = 160 μm and Din = 80 μm, (b) structuring a slit with the size of 30 × 500 μm2 into AISI304 stainless steel pipe with Dout = 100 μm, and (c) fabrication of short-cuts with the size of 65 × 50 μm2 from the same pipe as (b).
Let us discuss how to make laser-structuring a micropart from commercial components. A polylactic acid (PLA) pipe is employed as a starting component to fabricate the PLA-stents for medical usage. Figure 35 depicts three PLA-stents fabricated from the same PLA-pipe by the laser microtexturing. These three can be selectively made from PLA-pipe only by varying the slit width (Ws) to be 154, 156 and 160 micro-meter, respectively. The topological geometry of stents can be designed and fabricated for each medical treatment by tuning the laser microtexturing parameters as shown in Figure 36.
\nLaser micropart formation of stents from PLA pipe with Dout = 2.55 mm, Din = 2.20 mm, and the length of 25 m. (a) Ws = 154 μm, (b) Ws = 156 μm, and (c) Ws = 160 μm.
Various geometric transformations can be realized only by the laser processing such as the micromachining, microtexturing, and microstructuring in the above. Through the fusion of other manufacturing treatments with the laser processing, further advancement is expected to propose the innovative procedures. With combination of laser nano-/microtexturing with laser polishing, the surface property is selectively controlled to be superhydrophilic or superhydrophobic by tuning the LIPSS-conditions. With combination of laser microtexturing with the mechanical milling, a multimaterial part as well as a structural member with large area can be functionalized as a complex-shaped part or as a functionalized component.
\nAmong the engineering issues related to ultrashort pulse laser processing, how to put the fast-rate microtexturing into practice is one of the important targets. In addition to increase of repetition frequency in laser oscillation, new optical control must be developed to transform the spatial geometry and topology in shape into time sequence of scanning in beam technology.
\nThe picosecond and femtosecond laser processing is designed to be tools for advanced manufacturing; laser microdrilling, laser microtexturing, laser nano-/microtexturing, laser microstructuring, and so on. The dimensional accuracy, the spatial resolution as well as the circularity approaches to 1 μm or less than; every micropart, every microstructure, and every microtexture is fabricated in the product size of 10 to 100 μm range. Most of engineering issues related to surface and interface are well defined in this laser processing to find an optimum solution to each problem. Reduction of friction and wear in tools and works is attained by microtexturing onto the tool and part surfaces. Reliable joining between dissimilar materials and parts is put into practice by chemical adhesion with aid of microtextures on their interface. Surface and interface properties are also controllable by optimization of nano-/microtextures.
\nSustainable manufacturing requires for the well-designed processing to support the efficient circulation of products, parts, and materials in addition to recycle and reuse of second hands. Laser micromachining is useful to prolong the tool life, to revise the product surfaces and interfaces for multiple use and to assist the multimaterialization for second-hand products and parts.
\nFurther research and development on the unknown features of laser processing is necessary to advance new steps in innovative technology and medical engineering to further improve the sustainability in future society.
\nThe authors would like to express their gratitude to Mr. T. Hasegawa, T. Miyagawa (SIT), Dr. K. Wasa (TecDia, Co. Ltd.), Mr. T. Omata, and Mr. K. Sanbongi (LPS-works, Co. Ltd.) for their help in experiments. The present study was financially support in part by the METI with Supporting-Industry Projects in Japanese Government from 2010 to 2017.
\nThe authors declared no conflict of interest.
This chapter aims to gather and integrate studies on the development and neurocognitive processes involved in learning by children with autism spectrum disorder (ASD). It is believed that we need to know the neuropsychological foundations of learning for transmitting teaching.
\nFonseca [1] describes that, although learning capacity is inherent to several species, the human is the only species that transmits teaching intentionally.
\nThe literature reports that difficulties in learning conditional relationships between stimuli and concepts can lead to restrictions on an individual’s life and limit their social interaction.
\nCommunication plays an important role in integration of auditory and visual stimuli. This way, the understanding of the environment arises from the interaction between people, and learning is a result of the relationship created through sensory stimuli.
\nIt is known that language occurs mostly by meaningful experiences and situations. Although it depends on cognitive development, physiological integrity, and linguistic abilities, the environmental demands and support have an essential role in the child’s learning process. The construction of a socially shared code that leads to the assignment of meaning to the world’s various elements and experiences depends on the interaction with other significant persons. Language and memory are also dependent on meaningful situations and experiences. Abilities acquired through systematic training, despite frequently presenting fast results, are discarded as fast as they are acquired if they are not used or associated with meaningful contexts.
\nBased on these ideas, it seems reasonable to suppose that children with autism spectrum disorders present some disadvantage in the learning process because they have a social inability that is inherent to the ASD features, with varied degrees of impairment in social interactions. This way, it is accepted that language impairment of children with autism is not necessarily associated with linguistic structures, although they are affected in some children. Language impairments of children with ASD are essentially related to pragmatic abilities, also involving different levels of inabilities, from the lack of contact to subtle difficulties regarding interaction and conversation abilities. This is another reason why it is fundamental to understand the child’s context and environment, to assess the impact of each child’s inabilities and design intervention plans that address the most efficient and timely intervention.
\nSeveral recent studies show that including families in the therapeutic process of children with ASD increases better outcomes and prognosis than traditional one-on-one therapeutic approaches.
\nAuthors like Winnicot [2] consider emotional health as the development’s “back bone,” allowing cognitive and linguistic development and therefore enabling successful learning processes. Regardless of the causal relation and of the hierarchy among these areas of development, the importance of emotional health to learning is unquestionable. Perceiving and processing sensorial information and positively assimilating and interpreting information in order to build and learn healthily and creatively—that is, so that cognitive processing really occurs—depend on emotional health.
\nStudies that focus on the importance of engaging parents and caregivers are increasing in number and impact, with results increasingly consistent showing that the quality of life of parents and caregivers as well as their involvement in the intervention processes with children with ASD has a positive influence in the outcomes of these processes.
\nThe symptoms often found that ASD individuals also fit in the attention deficit hyperactivity disorder (ADHD) diagnosis, leading researches to compare learning performance between individuals with ASD and ADHD. Both diagnoses present significant impairments in cognitive performance, and it is important to make considerations from the neurocognitive perspective, raising questions and studies that involve tasks that require skills such as executive function (EF), theory of mind (ToM), language, and even correlations between them, seeking possible relations of causality.
\nEF is currently defined as a cognitive process necessary to define a goal and accomplish it, including the skills needed for it. Among them, working memory, inhibitory control, and cognitive flexibility are included. Working memory is the ability to rescue information previously stored to accomplish a task. Inhibitory control is the ability to suppress any actions or information that may interrupt or hinder the execution of the task or planning.
\nEF is closely linked to communicative skills, impacting learning, autonomy, and social life of the individual with ASD. This, in part, makes it difficult to understand the direct impact of EF impairment on children with ASD. Even the studies do not yet reach a consensus on impairments in EF in this population. Some studies indicate deficit and risk indicating the causal relationship between EF and other abilities, while others show that individuals with ASD do not present greater impairment than other groups with typical development (TD), developmental language disorder (DLD), and ADHD, indicating that this may not be the central impairment of the disorder.
\nSome researchers, including Kado and collaborators [3], report in their paper that the working memory performance of children with ASD and ADHD is similar, but their performance is below when compared with TD children, even when matched with IQ and school age. However, other researchers like Roleofs and collaborators did not find significant differences in working memory between adolescents and adults with ASD and intellectual disability when compared with individuals without ASD matched with IQ [4]. In an attempt to understand the interdependence of working memory with language, some studies separate the assessment of this cognitive ability between visual or spatial working memory and verbal working memory. A very interesting research that tries to understand the relation of working memory and language ability was Hill’s paper in 2015 [5]. The working memory was evaluated and compared in 5- to 8-year-old children with ASD and DLD. In this study, children with ASD were separated into two groups: children with and without language impairment. Children with proper language had better performances than children with language impairment. In addition, children with ASD and impaired language performed similarly to children with DLD in most verbal working memory tasks, but none of these groups differed in visual working memory tasks, suggesting their interdependence. This also happens with inhibition control.
\nThe findings of inhibitory control studies in children with ASD are diverse. Some indicate significant losses, while others find no differences compared to ADHD and DT. A widely used test to verify this ability is Stroop, which requires a refined language skill. Corbett and his collaborators [6] performed several inhibitory control tests, with and without the need for verbal expressive language. In the test, requiring verbal ability, children with ASD and ADHD had worse performances than TD children. In the test where the verbal expressive ability was not required—children should heard or saw a certain number to answer or not—children with ASD performed worse than children with DT and ADHD. However, it is important to note that, even in the test of visual working memory, which supposed to not requiring expressive language, the task required a linguistic ability.
\nAnd the same pattern happens in researches that attempt to assess cognitive flexibility [7] using tasks that require some level of language, comprehensive or expressive.
\nThe fact that neuropsychological assessments are intended to assess language and are not sensitive to these skills has been a frequent problem in most proposed assessments. In general, these assessments are made by psychologists who don’t have deep knowledge to determine language failures or even to distinguish or define the language structures required for that. Many misjudge language only as an expressive or verbal act, which is conceptually wrong, or disregard the cultural component of language, or even fail to evaluate language ability alone, often considering the cognitive strategies used by the child as language ability or otherwise. And as noted above, this knowledge is essential to clarify a possible causal relationship or to shed light on the possible association between cognitive and language areas, not only in children with ASD.
\nFor children with typical development, learning to speak can naturally come out observing and participating in moments and situations of communication with their parents and their community.
\nIn contrast, the act of learning to read and write is a complex task, composed of multiple interdependent processes, including understanding how the visual symbols correspond to spoken language [8].
\nThere is a range of articles that discuss the importance and interdependence of good oral language development for the success of written code acquisition, since writing is considered a representation of language.
\nThe literature of clinical neuropsychology reports that an assessment of cognitive strengths and weaknesses is useful for children with any developmental or learning disorder [9]. Considering the heterogeneity of the clinical settings of children with ASD, assessing and understanding the child’s individual strengths and weaknesses help better focus school plans and medical treatment and understand the possible areas of difficulty [9, 10].
\nWesterveld et al. [11] argue that learning to read is just another challenge for children with ASD. In their study, they found that approximately 30–60% of these children present some difficulty to develop literacy. It is important to highlight that even higher functioning children are also part of the statistics.
\nJones et al. [12] described that the cognitive heterogeneity of children with ASD is an element that makes it difficult to characterize the academic difficulties of this population. In addition, they report that cognitive abilities may not be congruent with their writing operations.
\nIn their paper, Fletcher and Miciak [9] argue the fact that some children have deficits in cognitive tests may not necessarily indicate causal direction in a child’s learning difficulties. A cognitive deficit does not indicate “why” a child has a learning problem.
\nAnother possible justification found in the literature for this variation in the development of reading and writing in children with ASD is the individual differences in language skills in the areas of phonology, semantics, and syntax [11, 12].
\nDavidson and Weismer [10] describe that reading disabilities can be classified based on problems that arise in decoding or comprehension abilities. It’s important to know the history of reading instruction for children with exceptional educational needs to consider what is known about reading abilities in individuals with ASD [13].
\nGabig [14] in her study with children with ASD, who reduced performance in areas such as vocabulary, may have negative influences on skills such as phonological processing. In addition, she found that some abilities related to decoding ability appear to be relatively intact.
\nRichardson and Heikki [8] discuss that the reasons for the phonological deficit in autism are still not clear but certainly interfere in the quality of mental representations and in the quality of the lexical, creating a poor link between the phonological awareness and reading skills.
\nOther authors question whether insufficient performance in reading skills are from specific verbal material defects or the consequence of perceptual, temporal, or long-term memory failure problems [15].
\nOverall, studies indicate that although the ability to recognize written words may be similar to that of typically developing learners, children with ASD tend to have deficits in integrating information. That is, they have difficulty retrieving and integrating meanings necessary for reading comprehension, including the ability to create connections between content read with prior knowledge and the ability to make inferences [16].
\nThe literature describes that most children with autism show average ability to recognize words while reading and to accurately spell words for age and grade level. In contrast, what the literature cannot yet explain is whether phonological awareness accompanies the good performance of phonetic decoding presented by children with autism [14].
\nThere are several studies that speculate if children with ASD would perform poorer when decoding pseudowords than when reading sight words because of a rote memorization of the visual shape of words. Most of their results indicated that children with autism do not show preference for the visual recognition of sight words over the decoding of pseudowords. It suggests that ASD children are capable of using visual and phonological recognition process to identify written words. Thus, studies lead us to believe that children with autism can benefit from other access channels to achieve good reading and writing performance.
\nHyperlexia is frequently one condition presented by children with ASD. It is characterized by a child’s precocious ability to read (far above what would be expected at their age). As with all individuals, children with hyperlexia have a wide range of skills and deficits. The high abilities to decode do not exclude the possibility that children may have a cognitive, language learning and/or social disorder.
\nWhat experts argue is that content that can be “formally” taught can be more easily learned by children with ASD. Already “intuitive” content such as phonological awareness skills would be less understood by this population.
\nCorso et al. [17] tested the correlation between reading tasks and different neuropsychological functions. They concluded that the strongest significant correlations occurred during executive functions tasks.
\nPellicano [18] pointed out that there are no studies that explicitly investigate the nature of executive functions in autism, arguing that there are only researches with the fractionation of these functions, that is, as if just one of these components can be specifically affected in autism.
\nIt is also often possible to find studies that compare the performance of children with ASD in theory of mind abilities (ToM). Some studies report that children with executive function deficits but with intact theory of mind abilities are hardly found.
\nSince the use of theory of mind abilities is essential to the mental and behavioral functioning, understanding the nature of these skills cannot be discarded during the assessment of reading and writing skills [19].
\nOne of the reasons why individuals with ASD may have difficulties in representing situations involving theory of mind may be explained by the fact that they have difficulty integrating clues that are relevant to the context and self-representation.
\nThis would be a justification for the text comprehension difficulties so often observed in this population, especially the difficulties related to understanding pragmatic and nonliteral aspects of language.
\nDeficits in the functioning of EF and literacy may differ between disturbances. Assessing them and identifying their deficits can provide information on which systems may be impaired and, most importantly, what can be done to stimulate them.
\nThe intervention approach may consider all areas of oral or written language where the children have deficits. It’s important to associate information about the student’s facilitating routes, whether auditory, visual, or motor. This way, the therapist should investigate whether the influence of several processing modalities obtain a more comprehensive understanding of the child’s potential perceptual abilities.
\nBosseler and Massaro [20] describe that technology is also being used in educational settings as an effective method of getting children engaged.
\nSome authors argue that if we guarantee the use of materials that address the different routes, learning can occur simply due to multiple exposures without necessarily having feedback and formal interference from the therapist. Although Bosseler and Massaro observed that children profited from seeing and hearing, spoken language can better guide language learning than modality alone.
\nWhat we should expect is that stimulated content must be learned operatively, processed, stored, and related to a set of experience to apply functionality and use it in a meaningful way.
\nCurrently, there are already some available therapeutic methods that can be developed by parents at home. However, there are not yet numerous clinical articles that allow a more accurate interpretation of the results. Thus, there are limitations in measuring the effectiveness of these approaches in treating autistic children, especially in the long-term.
\nThere are authors who emphasize how important it is to encourage these types of family-based therapeutic approaches as key interveners; however, understand that caregiver training should be done very carefully so that such interventions are not inadequately developed and reinforce difficulties and changes in child development.
\nAs we have seen, environmental support plays an essential role in the child’s learning process. The findings suggest that children with autism spectrum disorders (ASD) have some disadvantage in the learning process due to their inherent social disability to ASD characteristics.
\nThe literature describes that parental support and engagement in intervention processes with children with ASD positively influence the outcomes of these processes. Therefore, the intervention process should encompass all the possibilities and resources of oral and written language stimulation, associated with the information and collaboration presented by the caregivers.
\nThe learning disabilities of children with autism exist, and our ultimate goal for these children is to create a connection between learning and functionality.
\nIntechOpen Compacts provide a mid-length publishing format which bridges the gap between journal articles, book chapters and monographs, and cover content across all scientific disciplines. Compacts are the preferred publishing option for brief research reports on new topics, in-depth case studies, dissertations, or essays exploring new ideas, issues or broader topics on the research subject.
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