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Electroencephalography Measurements in Awake Marmosets Listening to Conspecific Vocalizations
07:52

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Published on: July 26, 2024

Human auditory cortical activation during self-vocalization.

Jeremy D W Greenlee1, Adam W Jackson, Fangxiang Chen

  • 1Department of Neurosurgery, University of Iowa, Iowa City, Iowa, United States of America. jeremy-greenlee@uiowa.edu

Plos One
|March 11, 2011
PubMed
Summary
This summary is machine-generated.

Vocalization suppresses or enhances auditory cortex activity in specific brain regions. These findings support models where efference copies modulate speech-sound processing during vocal control.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Speech Processing

Background:

  • Auditory feedback is crucial for adjusting vocalizations during speech.
  • Brain systems mediating vocalization-auditory feedback integration are complex.
  • Previous research utilized diverse experimental strategies to investigate these systems.

Purpose of the Study:

  • To investigate how vocalization alters speech-sound processing in the auditory cortex.
  • To record brain activity directly during vocalization and auditory stimulation in humans.

Main Methods:

  • Direct recording of evoked responses using intracranial electrodes in neurosurgery patients.
  • Stimulation with vocalization and playback stimuli.
  • Analysis of averaged evoked potentials and high gamma power changes.

Main Results:

  • Vocalization-induced suppressive effects were localized to circumscribed areas of the auditory cortex.
  • Cortical responses were enhanced at other sites during vocalization.
  • Enhanced activity was reflected in high gamma power, not averaged evoked potentials.

Conclusions:

  • Findings support forward models of vocal control.
  • Efference copies of premotor cortex activity modulate specific sub-regions of the auditory cortex.
  • Vocalization dynamically alters auditory cortex processing in a region-specific manner.