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Abstract:
Abstract: When the auditory syllable /pa/ is dubbed onto the
visual presentation of /ka/ articulation, subjects typically hear
/ta/ or /ka/. This "McGurk effect" demonstrates that seeing speech
may modify speech perception. We studied in 20 subjects if similar
modifications are observed even when subjects silently articulate
the syllable /ka/ when /pa/ is presented with earphones. Four
conditions were compared. 1) The McGurk condition with auditory
/pa/ dubbed onto visual /ka/, 2) Articulation condition, where
subjects silently articulated /ka/ when /pa/ was presented via
earphones, 3) Mirror condition, where subjects saw their own
articulation of /ka/ in a mirror when /pa/ was presented via
earphones, 4) Auditory control condition, where subjects saw /pa/
syllable on a computer screen and had to recognize an auditory
syllable immediately afterwards. Auditory stimuli were imbedded in
noise (signal-to-noise ratio 0 dB). In McGurk condition, only 6% of
the auditory /pa/ syllables were correctly identified.
Interestingly, the results in Mirror condition did nor differ
significantly from McGurk condition. A similar modification, albeit
smaller, was also obtained in the Articulation condition, where the
proportion of correctly identified /pa/ syllables was 32%,
significantly (18%, p < 0.01) less that in Auditory control
condition. The present results demonstrate, for the first time,
that 1) own articulation influences speech perception and that 2) a
strong McGurk effect can be produced when the subject sees his/her
own articulation in a mirror.
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