Abstract
Auditory feedback of one's own speech is used to monitor and adaptively control fluent speech production. A new study in PLOS Biology using electrocorticography (ECoG) in listeners whose speech was artificially delayed identifies regions involved in monitoring speech production.
Highlights
In the second pattern that was mainly located in the precentral gyrus (PreCG) indicating motor function, neural responses started before speech onset, and their amplitude was only affected by delayed feedback during reading sentences
Further investigation of the Delayed auditory feedback (DAF) effect was performed using regions of interest analysis at superior temporal gyrus (STG), supramarginal gyrus (SMG), ventral precentral gyrus, dorsal precentral gyrus, postcentral gyrus (PostCGA),Uan:dPinlefaersieonroftreothnatatPl goysrtCusG(hIFasGb)e.eSnTdGef,inSMedGas,paonsdtcentralgyrusinth PostCG are in sensory; vPreCG and dPreCG are in motor; and inferior frontal gyrus (IFG) is in frontal areas
After controlling for articulation duration, the response enhancement by DAF disappeared in PostCG and vPreCG, indicating that their responses were motor in nature
Summary
The importance of auditory feedback on speech production has been supported by many studies using altered auditory feedback. Previous neuroimaging studies using functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) found that signals in the posterior superior temporal gyrus (pSTG: auditory region) are correlated with DAF and are sensitive to the length of delayed feedback [2,3]. The behavioral results confirmed that articulation duration increased with delayed feedback and that the elongation effect was greater when people spoke sentences rather than isolated words.
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