Electroencephalogram coherence in children with and without autism spectrum disorders: decreased interhemispheric connectivity in autism.
Kids with autism show weaker between-hemisphere alpha links at rest and during social clips, a pattern that holds across EEG and MEG studies.
01Research in Context
What this study did
Researchers placed EEG caps on kids with and without autism. They recorded brain waves while the kids rested and while they watched short social videos.
The team then measured how well the left and right sides of the brain talked to each other. They focused on the alpha rhythm, the calm wave that shows when regions sync up.
What they found
Children with autism had weaker alpha-band links between the two sides of the brain. The gap showed up in both rest and video conditions.
The weaker links appeared in frontal and side-parietal areas, places we use for attention and social cues.
How this fits with other research
Léveillé et al. (2010) seems to disagree. They saw higher visual-cortex wiring in adults with autism during REM sleep. The key difference: they studied sleeping adults, while M et al. looked at awake children. Age and state change the picture.
Mamashli et al. (2021) backs the weak-link story. Using MEG, they found reduced connectivity when kids with autism viewed upside-down faces. Both papers tie weaker long-range links to social tasks.
Li et al. (2025) adds detail. Their fMRI scan found low connectivity in the right social-visual pathway and linked it to social symptom severity, echoing the EEG severity pattern seen here.
Why it matters
EEG coherence is quick, cheap, and portable. If a child's left-right alpha link is weak, you have an objective marker that aligns with social symptoms. Track it before and after intervention to see if your program is nudging the brain toward typical sync. Share the graph with parents; it turns an invisible difference into a clear picture they can understand.
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02At a glance
03Original abstract
Electroencephalogram coherence was measured in children with autism spectrum disorders (ASD) and control children at baseline and while watching videos of a familiar and unfamiliar person reading a story. Coherence was measured between the left and right hemispheres of the frontal, parietal, and temporal-parietal lobes (interhemispheric) and between the frontal and parietal lobes in each hemisphere (intrahemispheric). A data-reduction technique was employed to identify the frequency (alpha) that yielded significant differences in video conditions. Children with ASD displayed reduced coherence at the alpha frequency between the left and right temporal-parietal lobes in all conditions and reduced coherence at the alpha frequency between left and right frontal lobes during baseline. No group differences in intrahemispheric coherence at the alpha frequency emerged at the chosen statistical threshold. Results suggest decreased interhemispheric connectivity in frontal and temporal-parietal regions in children with ASD compared to controls.
Autism research : official journal of the International Society for Autism Research, 2014 · doi:10.1002/aur.1367