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Related Experiment Videos

Seeing speech: visual information from lip movements modifies activity in the human auditory cortex.

M Sams1, R Aulanko, M Hämäläinen

  • 1Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.

Neuroscience Letters
|June 10, 1991
PubMed
Summary

This study investigated how the brain integrates heard and seen speech. Visual information from lip movements influences auditory processing in the supratemporal auditory cortex.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Speech Processing

Background:

  • The integration of auditory and visual speech information is crucial for speech comprehension.
  • Understanding the neural basis of this integration, particularly the role of the auditory cortex, remains an active area of research.

Purpose of the Study:

  • To determine the cortical area where heard and seen speech are integrated.
  • To investigate the influence of visual articulatory information on auditory cortical responses.

Main Methods:

  • Neuromagnetic responses were recorded over the left hemisphere.
  • Subjects listened to auditory syllables while viewing a face articulating either matching or mismatching syllables.
  • Event-related magnetic fields were analyzed to identify neural correlates of speech integration.

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Main Results:

  • Infrequent auditory-visual mismatches elicited specific neuromagnetic responses.
  • These responses were localized to the supratemporal auditory cortex.
  • The findings indicate that visual speech information impacts auditory processing within the auditory cortex.

Conclusions:

  • The supratemporal auditory cortex is involved in integrating heard and seen speech.
  • Visual information from articulatory movements has a direct entry point into the auditory cortex.
  • This study provides evidence for early visual influence on auditory speech processing.