On Perception of Word-based Local Speech Rate in Japanese without Focusing Attention

摘要

Fundamental investigations about differential limen (DL) for word-based speech rate variations in Japanese are described. We carry out auditory tests with stimuli made by equally lengthening or shrotening a duration of a word i na sentence. We set up the experimetns to diffuse the subjects' focus of attentio. Wehn the focus is diffused, the DL value of acceleration increases in several cases. The obtained DLs are 18.9 msec/mora for acceleration and 26.5 msec/mora for deceleration.