Variable Perception of White Noise in Ambiguous Phonetic Contexts: The Case of /p/ and /f/ |
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Authors: | Valeriy Shafiro Lawrence J Raphael |
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Institution: | (1) Department of Communication Disorders & Sciences, Rush University Medical Center, 203 Senn, 1653 W. Congress Parkway, Chicago, IL 60612, USA;(2) Department of Communication Sciences and Disorders, Adelphi University, 1 South Avenue, Garden City, NY 11530, USA |
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Abstract: | The roles of spectro-temporal coherence, lexical status, and word position in the perception of speech in acoustic signals
containing a mixture of speech and nonspeech sounds were investigated. Stimuli consisted of nine (non)words in which either
white noise was inserted only into the silent interval preceding and/or following the onset of vocalic transitions ambiguous
between /p/ and /f/, or in which white noise overlaid the entire utterance. Ten listeners perceived 85% /f/s when noise was
inserted only into the silent interval signaling a stop closure, 47% /f/s when noise overlaid the entire (non)words, and 1%
in the control condition that contained no noise. Effects of spectro-temporal coherence seemed to have dominated perceptual
outcomes, although the lexical status and position of the critical phoneme also appeared to affect responses. The results
are explained more adequately by the theory of Auditory Scene Analysis than by the Motor Theory of Speech Perception. |
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Keywords: | Speech perception Acoustic cues Phonetic vs auditory processing |
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