The role of pitch and timing cues in the perception of phrasal grouping in Seoul Korean.

This paper reports two experiments in which listeners detected prosodic group boundaries in Seoul Korean speech, investigating how pitch and timing cues collaborate or compete with each other. Two types of timing cues, compensatory lengthening and group-final lengthening, were employed. The results show that both pitch and timing have demarcative functions which are exploited by listeners. However, listeners relied more on timing than pitch and this may be because in the experiments the pitch contour variations were limited to a small number of phonological categories, whereas temporal variations were more gradient. In addition, group-final lengthening was a more robust cue to the prosodic boundary than compensatory lengthening, and the integration of pitch and timing cues seems to be context-dependent. The results highlight the significance of local information in the universal grouping process and that the precise nature of the cues affect the way they integrate in perception.