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Adaptation to different mouth shapes influences
visual perception of ambiguous lip speech.
BC Jones, DR Feinberg, PEG Bestelmeyer, LM DeBruine & AC Little (in press). Psychonomic Bulletin & Review.
We investigated the effects of adaptation to mouth shapes associated
with different spoken sounds (sustained /m/ or /u/) on visual
perception of lip speech. Participants were significantly more likely
to label ambiguous faces on an /m/ to /u/ continuum as saying /u/
following adaptation to /m/ mouth shapes than they were in a
pre-adaptation test. By contrast, participants were significantly less
likely to label the ambiguous faces as saying /u/ following adaptation
to /u/ mouth shapes than they were in a pre-adaptation test. The
magnitude of these aftereffects was equivalent when the same individual
was shown in the adaptation and test phases of the experiment and when
different individuals were presented in the adaptation and test phases.
These findings present novel evidence that adaptation to natural
variations in facial appearance influences face perception and extend
previous research on face aftereffects to visual perception of lip
speech. |
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