Abstract
In the McGurk effect, visual information for articulation affects auditory judgments of speech syllables. Recently, questions have arisen concerning whether this effect is perceptual or post‐perceptual in nature [L. Rosenblum, J. Acoust. Soc. Am. Suppl. 1 84, S159 (1988)]. One way of exploring this issue is to determine the degree to which a visually influenced syllable sounds like its auditory‐alone counterpart. The hypothesis was made that, if the McGurk effect is truly perceptual in nature, then observers should have difficulty discriminating the sound of a visually influenced syllable from an audio‐alone syllable. Two experiments were conducted that implemented an AXB matching procedure to determine if a visually influenced /va/ (audio /ba/; video /va/) and an audio‐visual consistent /va/ (audio /va/; video /va/) sounded equally like an audio‐alone /va/, as is predicted by the above hypothesis. The results of the first experiment indicate that observers are more likely to match the audio /va/ to the audio‐visual consistent /va/ than to the visually influenced /va/. However, the results of the second experiment suggest that this matching might be based simply on similarities in acoustic characteristics and not on differential phonetic categorizations of the stimuli.
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