Segmental Influences on the Perception of High Pitch Accent Scaling in American English.

Abstract

Researchers investigating a broad array of questions in spoken language prosody routinely base their arguments on measurements taken from the F0 contours of representative speech samples. These analyses, however, frequently involve abstracting F0 contours away from the segmental strings that bear them, potentially overlooking in the process the role played by segmental qualities such as sonority or periodicity in the realization of F0 patterns by speakers and their interpretation by listeners. This paper reports the results of two experiments investigating how perception of F0 contours is affected by the segmental string over which those contours are realized. The first focuses on gaps in F0 contours created by voiceless obstruents such as stops and fricatives, while the second investigates F0 intervals spanning lower-sonority voiced segments, such as nasals and voiced fricatives. While these two scenarios might at first seem unrelated, we argue that listeners treat both with a single mechanism in perception, namely, by reducing (potentially to zero) the amount of weight accorded to those portions of the contour for determination of the speaker's intended F0 scaling level. We present an account of both effects within a unified model of F0 scaling perception called TCoG-F, with discussion of its implications for phonetic and phonological intonation research going forward.