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Related Experiment Video

Updated: May 15, 2026

Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging

Probing the Brain in Autism Using fMRI and Diffusion Tensor Imaging

Published on: September 12, 2011

Task-related functional connectivity in autism spectrum conditions: an EEG study using wavelet transform coherence.

Ana Catarino¹, Alexandre Andrade, Owen Churches

¹Cambridge Intellectual and Developmental Disabilities Research Group, Department of Psychiatry, University of Cambridge, Douglas House, 18b Trumpington Road, Cambridge, CB2 8AH, UK. am.catarino@gmail.com.

Molecular Autism

|January 15, 2013

Summary

Individuals with Autism Spectrum Conditions (ASC) show reduced interhemispheric coherence, impacting brain connectivity during visual tasks. This suggests potential differences in how people with ASC differentiate tasks compared to controls.

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

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

Area of Science:

Neuroscience
Developmental Psychology
Biomedical Engineering

Background:

Autism Spectrum Conditions (ASC) are neurodevelopmental disorders marked by diverse lifelong symptoms.
Abnormal neural connectivity is a proposed model for ASC, supported by findings of decreased interhemispheric coherence.
This study investigates reduced interhemispheric coherence in ASC and its relation to task performance.

Purpose of the Study:

To test the hypothesis of reduced interhemispheric coherence in individuals with ASC.
To examine how task performance affects interhemispheric coherence in ASC.
To explore the neural connectivity differences in ASC using electroencephalography.

Main Methods:

Analyzed electroencephalography (EEG) data from 15 individuals with ASC and 15 controls.
Employed Wavelet Transform Coherence (WTC) to measure interhemispheric coherence.
Assessed coherence during face and chair matching tasks across EEG frequencies (5-40 Hz) within 400 ms post-stimulus.

Main Results:

Reduced interhemispheric coherence was observed in the ASC group compared to controls across both tasks and electrode pairs.
Group differences in coherence emerged around 150 ms post-stimulus, primarily at frequencies below 13 Hz.
Controls showed task-specific coherence differences, while ASC group showed minimal differences, suggesting impaired task differentiation.

Conclusions:

Interhemispheric coherence is reduced in ASC in a time- and frequency-specific manner during visual processing of social and inanimate stimuli.
This reduction in coherence is widespread across the brain, supporting abnormal neural connectivity models in ASC.
WTC is a valuable tool for analyzing time-frequency dynamics of interhemispheric EEG coherence in ASC, highlighting potential task differentiation impairments.