Third International Conference on Spoken Language Processing (ICSLP 94)
To specify the location of perceptually dominant markers for temporal structures of speech, the acceptability or detectability of the modification of segmental duration is measured. The modification is carried out in a complementary way, i.e., two successive segments are lengthened or shortened, and have the same absolute duration and opposite directions of change. The first experiment using 15 four-mora word stimuli shows that a vowel (V) duration and its adjacent consonant (C) duration can perceptually compensate each other. This compensation is found to not depend on the temporal order of target pairs (C-to-V or V-to-C), but rather on the loudness difference between V and C; the acceptability decreases when the loudness difference between V and C becomes high. This suggests that perceptually dominant markers locate around major loudness jumps; this finding is supported by the second experiment using non-speech stimuli replicating the loudness contours of speech stimuli. The detectability of temporal displacement is higher at large loudness jumps than at small loudness jumps.
Bibliographic reference. Kato, Hiroaki / Tsuzaki, Minoru / Sagisaka, Yoshinori (1994): "Acceptability of temporal modification in consonant and vowel onsets", In ICSLP-1994, 1979-1983.