Abstract
Phoneme boundary shifts are well documented in the speech perception literature. Signal detection theory (SDT) models of speech perception allow for two possible explanations for these. Boundary shifts may be due to criterion shifts at a decision level or to changes in the underlying representations of stimuli. SDT methods can be applied to both identification and fixed-level discrimination data. While not providing a definitive explanation of a phoneme boundary shift, the results of such analyses can constrain explanations. In the present investigation, SDT analyses were applied to both identification and fixed-level discrimination results in which phoneme boundary shifts were observed. These data come from two sets of studies: (1) a ‘‘rate normalization’’ experiment, in which the duration of syllables affected voicing judgments, and (2) a trading relations study, in which the medial fricative/affricate boundary was influenced by both the silent duration before the fricative noise and fricative rise time. Implications for existing explanations of both of these phoneme boundary shifts are discussed. [Work supported by NIH.]
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