The roles of F1, F2, and vowel environment in stop consonant pattern processing were investigated using interaural transfer and selective adaptation. Previous results indicate that different patterns may exist for processing of stops, depending upon whether the stop occurs in a front or back vowel environment [L. Garrison, J. Acoust. Soc. Am. Suppl. 1 83, S70 (1988)]. Such pattern processing may reflect differences in the placement of F2 relative to F1. This experiment systematically manipulated the relationships between formants as well as vowel environment for CV syllables. These manipulations resulted in six stimuli that were used as adaptors on a [ba]-[da] test series. One adaptor shared its vowel percept ([ba]) and three other adaptors shared vowel category (back) with the test series. Finally, two adaptors were from a front vowel category. The results will be discussed in relation to how formant relationships and vowel environment affect pattern processing of stop consonants. [Work supported by NINCDS.]
Many theories of speech perception rely on the loci of spectral peaks as at least one factor upon which pattern recognition is based. However, when a peak is lower in amplitude than its neighbors, it may not be used in phonetic recognition. In the first experiment, a [u]-[i] series was constructed by manipulating the amplitude of a spectral peak (851 Hz). Subjects readily identified an item from the series with a low-amplitude, 851-Hz spectral peak as an [i]. It would appear that this peak, at a low amplitude, is not used at a phonetic level of processing. Further experiments test the perceptual locus of the use (or nonuse) of this low-amplitude peak information. Selective adaptation experiments were run in which the adaptors, including the [i] from the first experiment, varied in spectral overlap with a [u]-[u] test series in order to determine the degree to which the low-amplitude, 851-Hz peak is utilized in processing. The results will be discussed in terms of how peaks are analyzed at different levels of processing and how this relates to various theories of speech perception. [Work supported by NIDCD DC00219.]
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