Overview

• Scientists identified a brain circuit linking the motor and auditory cortices that helps differentiate self-generated speech from external sounds.
• The corollary discharge signal originates in the motor cortex's precentral gyrus and travels to the auditory cortex's superior temporal gyrus within milliseconds.
• Disruptions in this circuit are linked to auditory hallucinations in schizophrenia and may also contribute to stuttering.
• The findings were based on over 3,200 brain activity recordings from epilepsy patients undergoing surgery who participated in speech experiments.
• Researchers plan to explore noninvasive diagnostic methods for schizophrenia and further study the circuit's role in auditory hallucinations.