Abstract
This research investigated effects of the visually specified place of articulation on perceived voicing. It is known that the /b/–/p/ boundary along a voice-onset-time (VOT) continuum falls at a shorter VOT than the /d/–/t/ boundary. Green and Kuhl [Percept. Psychophys. 45, 34–42 (1989)] demonstrated that tokens from an auditory /ibi/–/ipi/ continuum dubbed with an /igi/ video and perceived as /idi/ and /iti/ due to the ‘‘McGurk effect’’ had a voicing boundary at a longer VOT than when presented only auditorily and perceived as /ibi/ and /ipi/. We extended this finding in two directions. First, using an auditory /bi/–/pi/ series with a video /ti/ for which the McGurk effect did not always occur, we compared visually influenced (/d,t/) and visually uninfluenced (/b,p/) responses for these audiovisually discrepant stimuli. The /d/–/t/ boundary was at a longer VOT than the /b/–/p/ boundary, affirming the boundary shift’s perceptual, not stimulus-based, origin. Second, we tested the generalizability of Green and Kuhl’s findings using auditory /di/–/ti/ tokens with /ti/ and /pi/ videos. Preliminary results suggest that boundaries for /b/–/p/ and /bd/–/pt/ percepts (with video /pi/) may occur at shorter VOTs than for /d/–/t/ percepts (with video /ti/). Thus, the visually induced voicing boundary shift apparently replicates across different stimulus configurations. [Work supported by NIH/NIDCD.]
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