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The McGurk effect shows how vision changes speech perception. Our study suggests that perceived words, not just auditory ones, influence lexical access, relying on integrated multisensory information.

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Area of Science:

  • Cognitive Psychology
  • Auditory Perception
  • Multisensory Integration

Background:

  • The McGurk effect demonstrates visual influence on auditory speech perception.
  • Previous research suggested auditory signals alone inform lexical access before full integration.

Purpose of the Study:

  • To investigate the timing of multisensory processes in the McGurk effect.
  • To determine if perceived or auditory information drives lexical access.

Main Methods:

  • Replication of Ostrand et al. (2016) design using optimized McGurk stimuli.
  • Lexical decision task with incongruent auditory and visual speech primes.
  • Analysis of semantic priming effects.

Main Results:

  • Perceived words, not auditory, typically induced semantic priming.
  • Priming strength correlated with the magnitude of the McGurk effect.
  • Findings contrast with previous research suggesting auditory-only lexical access.

Conclusions:

  • Lexical access utilizes integrated multisensory information, reflecting perceived speech.
  • The dominant unimodal signal for lexical access depends on the final perception.