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Using McGurk effect to detect speech-perceptional abnormalities in refractory epilepsy.

Ravish R Keni1, Ashalatha Radhakrishnan1

  • 1R. Madhavan Nayar Centre for Comprehensive Epilepsy Care, Department of Neurology, Sree ChitraTirunal Institute for Medical Sciences and Technology, Kerala, India.

Epilepsy & Behavior : E&B
|November 29, 2020
PubMed
Summary

Refractory epilepsy patients show altered McGurk effect perception, with left hemispheric epilepsy patients demonstrating better perception. This finding suggests the McGurk effect can detect speech perception abnormalities in epilepsy.

Keywords:
Audiovisual integrationEpilepsyMcGurk effectSpeech perception

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Area of Science:

  • Neuroscience
  • Speech Perception
  • Epilepsy Research

Background:

  • The McGurk effect illustrates the interplay between auditory and visual input in speech perception.
  • Refractory epilepsy is associated with neuropsychological deficits impacting multimodal integration, making these patients suitable for studying the McGurk effect.

Purpose of the Study:

  • To investigate the McGurk effect in patients with medically refractory epilepsy.
  • To determine if epilepsy laterality or duration influences McGurk effect perception.
  • To explore correlations between McGurk effect perception and other cognitive functions.

Main Methods:

  • Studied 50 patients with medically refractory left or right hemispheric epilepsy.
  • Assessed McGurk effect perception, visual memory, facial emotion recognition, and lip-reading abilities.
  • Analyzed data based on clinical, radiological, and electrophysiological findings.

Main Results:

  • McGurk effect perception was significantly better in patients with left hemispheric epilepsy (71%) compared to right (29%).
  • Impaired visual memory, facial emotion recognition, and lip-reading were associated with reduced McGurk effect perception.
  • Longer epilepsy duration (≥10 years) correlated with significantly diminished McGurk effect perception.

Conclusions:

  • The McGurk effect is a valuable tool for identifying subtle speech perception abnormalities in refractory epilepsy patients.
  • Early detection using the McGurk effect may precede significant, irreversible speech and language dysfunction.
  • Findings highlight the impact of epilepsy on multimodal speech processing.