Abstract
Recent experiments have provided evidence for an auditory locus of selective adaptation effects. The present experiment further tests this theory. A [pa]-[ka] series was constructed. The burst frication from the [ka] syllable was added to the vowels [u] and [i]. Subjects identified these syllables as [tu] and [pi]. These three syllables contained physically identical bursts but were identified by subjects as stops with three different places of articulation. The [pa], [ka], [tu], and [pi] syllables were used as adaptors on the [pa]-[ka] test series. The [ka], [tu], and [pi] syllables, which contained identical bursts, produced similar boundary shifts. The spectrally different [pa], although sharing its initial phoneme with [pi], produced an opposite shift. These results support an auditory locus for adaptation with little or no phonetic or linguistic influence. In a pairedcomparison procedure, [pa], [ka], [pi], and [tu] were used as exemplars. Both the [pa] and [pi] syllables produced fewer [p] responses to an ambiguous test item, whereas [ka] had the opposite effect of producing more [p] responses. The phonetic quality of the exemplar appears to have been the primary determinant of its effects in the paired-comparison procedure. Together, these results support a two-stage model of speech perception, in which neither of these stages are vowel contingent.
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The research reported here was supported by National Institute of Neurological, Communicative Disorders and Stroke Grant NS19653-01 to the State University of New York at Buffalo. The adaptation experiment reported here was part of an undergraduate honors project submitted by the first author to the Psychology Department, State University of New York at Buffalo.
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Garrison, L.F., Sawusch, J.R. Adaptation of place perception for stops: Effects of spectral match between adaptor and test series. Perception & Psychophysics 40, 419–430 (1986). https://doi.org/10.3758/BF03208202
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DOI: https://doi.org/10.3758/BF03208202