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Related Experiment Videos

Modulation of the auditory cortex during speech: an MEG study.

John F Houde1, Srikantan S Nagarajan, Kensuke Sekihara

  • 1Center for Integrative Neuroscience, University of California, San Francisco 94143, USA. houde@phy.ucsf.edu

Journal of Cognitive Neuroscience
|December 24, 2002
PubMed
Summary

The auditory cortex response to speech is weaker during self-production than playback. This suggests the brain adjusts auditory sensitivity based on expected speech feedback.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Production and Perception

Background:

  • Behavioral and brain imaging studies show speech perception and production interact.
  • Understanding this interaction is key to understanding auditory processing.

Purpose of the Study:

  • To investigate auditory cortical responses during self-produced speech with altered feedback.
  • To compare brain responses to self-produced versus externally presented speech.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity from both hemispheres.
  • Subjects spoke while hearing controlled acoustic versions of their speech feedback.
  • Responses were compared to tape playback of their own speech and to auditory stimuli like tones and noise.

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Main Results:

  • Auditory cortical responses were weaker for self-produced speech compared to tape playback.
  • Responses to tones were also attenuated during speech production.
  • Responses to gated noise stimuli showed no difference between conditions.

Conclusions:

  • The auditory cortex attenuates its sensitivity during speech production.
  • Auditory cortex activity is modulated by the expectation of acoustic feedback.
  • These findings provide insights into the neural mechanisms of speech processing.