In autism, caregiver-noted inappropriate speech tracks how the brain responds to a magnetic pulse.

Scientists want to know if brain stimulation can help explain real-world behaviors in autism. In this study, researchers tested an approach using magnetic pulses on the brain, called continuous theta-burst stimulation. They applied this stimulation to the brain area that controls movement. Then, they checked brain responses by measuring muscle electrical signals, known as motor evoked potentials, several times over an hour. This showed how the brain's excitability changed over time. The researchers compared these brain signals to reports from caregivers about each person's everyday actions. They found that participants with higher scores for inappropriate speech showed steadily increasing brain responses after stimulation. In particular, traits like talking excessively and talking loudly to oneself stood out most. Other traits, like cognitive ability and movement difficulties, did not show this pattern. The results suggest this specific speech behavior links to how movement areas in the brain react to stimulation.

Why it matters

If the link holds, a caregiver questionnaire could one day help predict how an autistic person's brain reacts to magnetic stimulation, informing personalized treatments. It also suggests that a visible everyday behavior might reflect a measurable change in brain plasticity, opening a window into autism's biology—but the effect is tentative and needs replication.

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