scholarly journals A single- and paired-pulse TMS-EEG investigation of the N100 and long interval cortical inhibition in autism spectrum disorder

2021 ◽  
Author(s):  
Melissa Kirkovski ◽  
Aron T Hill ◽  
Nigel C Rogasch ◽  
Takashi Saeki ◽  
Bernadette M Fitzgibbon ◽  
...  
Keyword(s):  
Autism Spectrum Disorder ◽  
Intellectual Disability ◽  
Primary Motor Cortex ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Cortical Inhibition ◽  
Gamma Aminobutyric Acid ◽  
Stimulus Interval ◽  
Temporoparietal Junction ◽  
Adults With Asd

Background: There is evidence to suggest a disruption of gamma-aminobutyric acid (GABA) in autism spectrum disorder (ASD), but findings are mixed. Concurrent electroencephalography and transcranial magnetic stimulation (TMS-EEG) provides a novel method by which to probe GABA-mediated cortical inhibition. Methods: With a particular focus on GABAB-ergic mechanisms, we investigated the N100 peak of the TMS evoked potential (TEP), as well as long interval cortical inhibition (LICIEEG) in adults with ASD (n = 23; 12 female) without intellectual disability, and a neurotypical comparison group (n =22; 12 female) matched for age, sex, and IQ. Seventy-five single- (spTMS) and 75 paired- (ppTMS; 100 ms inter-stimulus-interval) pulses were applied to the right primary motor cortex (M1), right temporoparietal junction (TPJ), and right dorsolateral prefrontal cortex (DLPFC) while EEG was recorded from 20 scalp electrodes. Additionally, electromyography (EMG) was used to investigate corticospinal inhibition following ppTMS to M1 (LICIEMG). Results: There were no group differences in the N100 amplitude or latency following spTMS. LICI outcomes following ppTMS, as measured by either EEG or EMG, also did not differ between groups. These findings were further supported by Bayesian analyses, which provided weak-moderate support for the null hypothesis. Limitations: Data presented here reflect adults without intellectual disability, and the generalisability of these results is therefore limited. Conclusions: The findings of this study argue against GABAB-ergic impairment in adults with ASD without intellectual disability, at least at the cortical regions examined. Further research investigating these mechanisms in ASD at various ages, with varying degrees of symptomatology, and at different brain sites is an important factor in understating the role of GABA in the neuropathophysiology of ASD.

iPod Touch® to Increase Functional Communication of Adults With Autism Spectrum Disorder and Significant Intellectual Disability

2015 ◽  
Vol 32 (3) ◽  
pp. 209-217 ◽  
Author(s):  
Kaori Nepo ◽  
Matt Tincani ◽  
Saul Axelrod ◽  
Lois Meszaros
Keyword(s):  
Autism Spectrum Disorder ◽  
Intellectual Disability ◽  
Single Case ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Speech Communication ◽  
Functional Communication ◽  
Adults With Autism ◽  
Ipod Touch ◽  
Adults With Asd

Adults with autism spectrum disorder (ASD) and significant intellectual disability (ID) often have limited speech communication abilities. Abundant research supports use of augmentative and alternative communication (AAC) to enhance skills of children with ASD and ID, but less research has examined efficacy of AAC with non-speaking adults. In this study, three adults with ASD and significant ID were taught basic functional communication using the iPod Touch® with MyTalk Mobile® software within a single-case, multiple-probe across-subjects design. The iPod Touch® taught with most-to-least prompting increased participants’ independent manding, participants were able to discriminate between picture symbols, and participants’ manding generalized to a naturalistic setting with typically available preferred items. Implementation of AAC coincided with increases in speech for one participant. Results illustrate how an applied behavior analysis approach incorporating a speech generating device is effective in teaching communication to adults with ASD and significant ID.

scholarly journals Sensory Processing and Aggressive Behavior in Adults with Autism Spectrum Disorder

2021 ◽  
Vol 11 (1) ◽  
pp. 95
Author(s):  
Frank van den Boogert ◽  
Bram Sizoo ◽  
Pascalle Spaan ◽  
Sharon Tolstra ◽  
Yvonne H. A. Bouman ◽  
...  
Keyword(s):  
Autism Spectrum Disorder ◽  
Aggressive Behavior ◽  
Sensory Processing ◽  
Short Form ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Sensory Profile ◽  
Sensory Sensitivity ◽  
Aggression Questionnaire ◽  
Adults With Asd

Autism spectrum disorder (ASD) may be accompanied by aggressive behavior and is associated with sensory processing difficulties. The present study aims to investigate the direct association between sensory processing and aggressive behavior in adults with ASD. A total of 101 Dutch adult participants with ASD, treated in outpatient or inpatient facilities, completed the Adolescent/Adult Sensory Profile (AASP), the Reactive-Proactive Aggression Questionnaire (RPQ), and the Aggression Questionnaire—Short Form (AQ-SF). Results revealed that sensory processing difficulties are associated with more aggressive behavior (f2=0.25), more proactive (f2=0.19) and reactive aggression (f2=0.27), more physical (f2=0.08) and verbal aggression (f2=0.13), and more anger (f2=0.20) and hostility (f2=0.12). Evidence was found for an interaction of the neurological threshold and behavioral response on total aggression and hostility. Participants with higher scores in comparison to the norm group in sensory sensitivity had the highest risk of aggressive behavior. In conclusion, clinical practice may benefit from applying detailed diagnostics on sensory processing difficulties when treating aggressive behavior in adults with ASD.

scholarly journals Implicit Semantic Processing of Linguistic and Non-linguistic Stimuli in Adults with Autism Spectrum Disorder

2021 ◽  
Author(s):  
Emme O’Rourke ◽  
Emily L. Coderre
Keyword(s):  
Autism Spectrum Disorder ◽  
Language Processing ◽  
Semantic Processing ◽  
Autistic Traits ◽  
Autism Spectrum ◽  
Event Related Potential ◽  
Spectrum Disorder ◽  
Adults With Autism ◽  
Priming Task ◽  
Adults With Asd

AbstractWhile many individuals with autism spectrum disorder (ASD) experience difficulties with language processing, non-linguistic semantic processing may be intact. We examined neural responses to an implicit semantic priming task by comparing N400 responses—an event-related potential related to semantic processing—in response to semantically related or unrelated pairs of words or pictures. Adults with ASD showed larger N400 responses than typically developing adults for pictures, but no group differences occurred for words. However, we also observed complex modulations of N400 amplitude by age and by level of autistic traits. These results offer important implications for how groups are delineated and compared in autism research.

scholarly journals Burnout among direct support workers of adults with autism spectrum disorder and intellectual disability

2021 ◽  
Author(s):  
Sylvie Couderc ◽  
Florence Cousson‐Gélie ◽  
Eric Pernon ◽  
Bertrand Porro ◽  
Stéphanie Miot ◽  
...  
Keyword(s):  
Autism Spectrum Disorder ◽  
Intellectual Disability ◽  
Autism Spectrum ◽  
Spectrum Disorder ◽  
Adults With Autism ◽  
Direct Support
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