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Visual influences on speech perception processes


An experiment is reported, the results of which confirm and extend an earlier observation that visual information for the speaker’s lip movements profoundly modifies the auditorv perception of natural speech by normally hearing subjects. The effect is most pronounced when there is auditory information for a bilabial utterance combined with visual information for a nonlabial utterance. However, the effect is also obtained with the reverse combination, although to a lesser extent. These findings are considered for their relevance to auditory theories of speech perception.


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Correspondence to Harry McGurk.

Additional information

This research was supported by a grant from the U.K. Leverhulme Trust Fund to author McGurk.

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Macdonald, J., McGurk, H. Visual influences on speech perception processes. Perception & Psychophysics 24, 253–257 (1978).

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  • Auditory Stimulus
  • Speech Perception
  • Auditory Information
  • Dichotic Listening
  • Stop Consonant