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Auditory cortex encodes lipreading information through spatially distributed activity.

Ganesan Karthik1, Cody Zhewei Cao1, Michael I Demidenko1

  • 1Department of Psychology, University of Michigan, Ann Arbor, MI 48109, USA.

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|August 17, 2024
PubMed
Summary
This summary is machine-generated.

Visual speech, or lipreading, is processed in the auditory system, enhancing speech perception. This study shows the auditory cortex decodes silent lipreading, suggesting predictive coding for improved understanding.

Keywords:
ECoGaudiovisualiEEGmultisensorysEEGspeech

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Speech Processing

Background:

  • Visual speech (lipreading) enhances auditory speech perception.
  • The neural representation of visual speech within the auditory system remains unclear.
  • Existing models suggest visual speech modulates auditory representations, but direct evidence is lacking.

Purpose of the Study:

  • To investigate if the auditory system encodes visual speech information.
  • To test the hypothesis that visual speech modulates neural representations in the auditory cortex.
  • To understand the temporal dynamics of visual speech processing in the auditory system.

Main Methods:

  • Acquired functional magnetic resonance imaging (fMRI) data from healthy adults.
  • Obtained intracranial recordings from epilepsy patients.
  • Utilized linear classifiers to decode silently lipread words from auditory cortex activity patterns.

Main Results:

  • Linear classifiers successfully decoded silently lipread words using auditory cortex activity.
  • Intracranial recordings showed lipread words were classified earlier than heard words.
  • This suggests a predictive role for visual speech in auditory processing.

Conclusions:

  • The auditory system actively encodes visual speech information.
  • Visual speech input is integrated with auditory input, potentially through predictive coding mechanisms.
  • This integration enhances speech perception accuracy by refining neural representations.