Reduced interhemispheric connectivity in childhood autism detected by electroencephalographic photic driving coherence.

Worsham et al. (2015) used a flashing light to test brain links in autistic boys. They placed EEG caps on the kids and watched how the left and right sides of the brain talked during the light show.

The team compared the boys to same-age kids without autism. All children could speak in sentences.

Autistic boys had fewer strong links between the two sides of the brain. The gap showed up most in the fast beta waves.

The light test gave a clear, number-based marker of atypical wiring.

de Jonge et al. (2025) widens the picture. Their huge LEAP study shows that EEG network gaps in autism shift with age. Teens have weaker long-range alpha links, while adults show looser local clustering. Worsham et al. (2015) now looks like the childhood slice of this life-span map.

Marcell et al. (1988) once saw no hemispheric shape differences on CT scans. The new EEG result does not clash; the 1988 study tested adult brains for structural size, while V et al. tested child brains for real-time connection strength.

Dudley et al. (2019) also found odd cerebellar links in autistic kids, but used fMRI during rest. Both papers agree that brain wires can be mis-timed, even when tasks differ.

You now have a quick, low-cost lab test that flags weak cross-brain talk in verbal autistic children. Add a two-minute photic-driving check to your EEG screen or reassessment packet. If coherence scores fall short, you can target joint-attention or turn-taking drills that force both hemispheres to sync, then retest to see if neural links—and social performance—tighten.