The coupling between auditory and motor cortices is rate-restricted: Evidence for an intrinsic speech-motor rhythm

M. Florencia Assaneo, David Poeppel

Research output: Contribution to journalArticle

Abstract

The relation between perception and action remains a fundamental question for neuroscience. In the context of speech, existing data suggest an interaction between auditory and speech-motor cortices, but the underlying mechanisms remain incompletely characterized. We fill a basic gap in our understanding of the sensorimotor processing of speech by examining the synchronization between auditory and speech-motor regions over different speech rates, a fundamental parameter delimiting successful perception. First, using magnetoencephalography, we measure synchronization between auditory and speech-motor regions while participants listen to syllables at various rates. We show, surprisingly, that auditory-motor synchrony is significant only over a restricted range and is enhanced at ∼4.5 Hz, a value compatible with the mean syllable rate across languages. Second, neural modeling reveals that this modulated coupling plausibly emerges as a consequence of the underlying neural architecture. The findings suggest that the temporal patterns of speech emerge as a consequence of the intrinsic rhythms of cortical areas.

Original languageEnglish (US)
Article numbereaao3842
JournalScience Advances
Volume4
Issue number2
DOIs
StatePublished - Feb 2018

ASJC Scopus subject areas

  • General

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