Psychological correlates of handedness and corpus callosum asymmetry in autism: the left hemisphere dysfunction theory revisited.

Matson et al. (2013) looked at handedness and brain shape in teens with autism. They used MRI to measure the corpus callosum, the bridge between the two sides of the brain.

They asked: does being more right-side dominant link to worse or better skills in autism? They scored symptom severity and IQ to find out.

Rightward brain bias helped thinking in some callosum areas but hurt in others. There was no clear link between hand use and autism traits.

The results were mixed, so the old idea that the left side is simply broken in autism is too simple.

Richmond (1983) first said autistic kids show left-side weakness on neuropsych tests. L et al. add brain pictures and handedness, showing the story is patchy, not one-sided.

Jouravlev et al. (2020) found less left-side language action in autistic adults. That seems to clash with L et al., but Olessia used speech tasks while L et al. looked at structure and hand skill. Different tools, different answers.

Ghaziuddin et al. (1996) saw hand choice was less steady in autistic children. L et al. echo this by finding no group hand difference, backing the idea that hand use alone does not flag autism.

Stop blaming every autism challenge on left-brain failure. Right-side areas can help or hurt depending on the task. When you test a client, pick tools that tap both sides and watch mixed profiles, not just one weak hemisphere.