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Auditory-visual processing represented in the human superior temporal gyrus.

R A Reale1, G A Calvert, T Thesen

  • 1Department of Neurosurgery, University of Iowa, Iowa City, IA 52242, USA. rreale@wisc.edu

Neuroscience
|January 24, 2007
PubMed
Summary
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Visual speech information significantly impacts auditory responses in the posterior lateral superior temporal gyrus (PLST). This audiovisual influence is more pronounced in the brain

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Visual Speech Processing

Background:

  • Natural communication integrates auditory and visual speech cues.
  • The posterior lateral superior temporal gyrus (PLST) is an acoustically responsive brain region.
  • Prior research suggests PLST may process audiovisual speech interactions.

Purpose of the Study:

  • To investigate if area PLST exhibits neural signals related to audiovisual speech.
  • To determine how visual speech information modulates auditory responses in PLST.

Main Methods:

  • Event-related potentials (ERPs) were recorded from PLST in epilepsy patients.
  • Cortical ERP maps were generated during auditory, visual, and bimodal speech tasks.
  • Stimuli included auditory syllables, silent visual speech, and audiovisual syllables with matched/mismatched faces.

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Main Results:

  • Auditory speech responses in PLST were significantly influenced by visual speech stimuli.
  • Visual stimuli included articulating faces and meaningless facial movements (gurning).
  • The extent of this audiovisual influence was larger in the speech-dominant hemisphere.

Conclusions:

  • Area PLST plays a role in integrating auditory and visual speech information.
  • Visual speech input modulates neural responses to auditory speech in PLST.
  • Hemispheric specialization for speech processing is evident in audiovisual integration within PLST.