Psychosocial deficits across autism and schizotypal spectra are interactively modulated by excitatory and inhibitory neurotransmission.

Researchers scanned the brains of typical college students. They measured two brain chemicals: glutamate and GABA. They also gave each student short quizzes about autistic and schizotypal traits.

The team focused on the right superior temporal cortex. This spot helps us read faces and voices. They wanted to know if chemical levels there line up with social skill scores.

Students with high glutamate plus low GABA scored worst on social items. The same combo also linked to more schizotypal, or odd-interpersonal, traits.

Neither chemical alone told the story. Only the pair predicted poorer social skills.

The result sounds opposite to Maier et al. (2022), who saw higher GABA in autistic adults. The key difference is brain real estate: Simon checked the left dlPFC, while C et al. looked at the superior temporal lobe. Different zip codes, different rules.

Carvalho Pereira et al. (2018) and Sapey-Triomphe et al. (2019) both found lower regional GABA tied to poorer communication or tactile issues. C et al. extends those links by showing the glutamate side of the seesaw matters too.

Dolezal et al. (2010) first showed autistic and schizotypal traits can sit on opposite cognitive poles. C et al. adds brain chemistry evidence that both spectra share one imbalance marker.

You can’t scan every client, but you can watch for social struggles that feel “stuck.” When standard social stories or video modeling move slowly, remember the excitatory-inhibitory mix might be part of the picture. Pair your ABA drills with strategies that calm sensory input—noise reduction, clear visuals, predictable schedules—to nudge the balance toward learning. Track small social wins; they may mirror the chemical shift we can’t see.