ASA 125th Meeting Ottawa 1993 May

4pSP1. An exploration of phoneme structure and models of classification for place of articulation.

Xiaofeng Li

Jennifer L. Cho

Ctr. for Cognitive and Psycholinguistic Sci., Binghamton Univ., Binghamton, NY 13902-6000

Speech perception research has typically investigated phoneme categories and specified trading relation effects in terms of limits defined along single dimensions. However, phoneme categories vary along a number of significant physical dimensions, with stimuli distributed across the multidimensional perceptual space often differing in goodness of category membership. The current study used a set of synthetic CV syllables based on F2- and F3-onset frequencies to examine the internal structure of several phonetic categories within the same vowel context. Experiment 1 used a free classification task to establish the perceptual structure of categories differing in place of articulation. Experiments 2, 3, and 4, respectively, related response times of a speeded classification task with category goodness ratings and a multidimensional phonetic perceptual space based upon similarity ratings. The multidimensional space was quite distinct compared to a prior space obtained for a different vowel context. Results are discussed in terms of prototype and exemplar models of phonetic classification. [Research supported in part by grants from NSF and AFOSR to R. E. Pastore, and NIH.] [sup a)]Now at Indiana University.