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Speech target modulates speaking induced suppression in auditory cortex.

Maria I Ventura1, Srikantan S Nagarajan, John F Houde

  • 1Department of Otolaryngology, University of California, San Francisco, San Francisco, CA, USA. maria.ventura@radiology.ucsf.edu

BMC Neuroscience
|June 16, 2009
PubMed
Summary
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Speaking-induced suppression (SIS) in the auditory cortex decreases as speech becomes faster and more complex. This finding supports models of auditory feedback processing during speech production.

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Motor Control

Background:

  • Previous magnetoencephalography (MEG) studies show speaking-induced suppression (SIS) in the auditory cortex.
  • SIS is characterized by a reduced M100 response to self-produced speech compared to heard speech playback.

Purpose of the Study:

  • To investigate how utterance rapidity and complexity affect speaking-induced suppression (SIS).
  • To further understand auditory feedback processing and speech motor control.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure M100 responses during vocalization tasks.
  • Subjects performed simple and complex speech tasks at varying rapidities.

Main Results:

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  • The greatest SIS was observed during simple speech tasks.
  • SIS significantly decreased as utterances became more rapid and complex (p = 0.0003).

    • Conclusions:

    • Findings support a model where auditory feedback is compared to an efference-copy prediction.
    • Results offer insights into speech motor output control and the auditory cortex's role in processing auditory feedback.