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Related Concept Videos

Autism Spectrum Disorder01:19

Autism Spectrum Disorder

Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Related Experiment Video

Updated: Jul 14, 2026

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder
08:17

A Semantic Priming Event-related Potential (ERP) Task to Study Lexico-semantic and Visuo-semantic Processing in Autism Spectrum Disorder

Published on: April 12, 2018

Abnormal EEG lateralization in boys with autism.

Tatiana A Stroganova1, Gudrun Nygren, Marina M Tsetlin

  • 1Moscow University of Psychology and Education, 103051 Moscow, Russia, and Department of Child & Adolescent Psychiatry, Sahlgrenska University Hospital, Gothenburg, Sweden.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|June 22, 2007
PubMed
Summary

Boys with autism show abnormal brain electrical activity patterns, specifically in functional brain lateralization. This EEG study reveals atypical asymmetry, suggesting differences in how brain regions generate electrical rhythms.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Biomedical Engineering

Background:

  • Autism Spectrum Disorder (ASD) is a neurodevelopmental condition characterized by social communication deficits and restricted, repetitive behaviors.
  • Understanding the neurobiological underpinnings of autism is crucial for developing effective interventions.
  • Previous research suggests atypical brain development and function in individuals with autism.

Purpose of the Study:

  • To investigate functional brain abnormalities in young boys with autism using electroencephalography (EEG).
  • To analyze EEG spectral power and interhemispheric asymmetry during a controlled visual attention task.
  • To identify differences in brain electrical activity and lateralization between boys with autism and typically developing boys.

Main Methods:

  • EEG was recorded from two independent samples of boys with autism (BWA) and age-matched typically developing boys (TDB).
  • Participants were aged 3-8 years and engaged in a task requiring sustained visual attention and behavioral stillness.
  • Analysis focused on EEG spectral power (SP) and interhemispheric asymmetry in delta, theta, and alpha frequency bands.

Main Results:

  • Boys with autism exhibited non-homogeneous patterns in theta and alpha spectral power.
  • Atypical leftward broadband EEG asymmetry was observed in boys with autism, particularly in mid-temporal regions.
  • The typical leftward asymmetry of the mu rhythm was absent in boys with autism, while prefrontal delta power was higher.

Conclusions:

  • Abnormal broadband EEG asymmetry in autism may indicate reduced capacity of the right temporal cortex to generate EEG rhythms.
  • The absence of normal mu rhythm asymmetry suggests regionally specific abnormalities in EEG lateralization in autism.
  • The findings provide evidence for abnormal functional brain lateralization in autism.