Parameters of spectral/temporal fusion in speech perception.
| Number | 490 |
|---|---|
| Year | 1984 |
| Drawer | 8 |
| Entry Date | 11/19/1999 |
| Authors | Repp, B. H. & Bentin, S. |
| Contact | |
| Publication | Perception & Psychophysics, 36, 523-530. |
| url | http://www.haskins.yale.edu/Reprints/HL0490.pdf |
| Abstract | When the distinctive formant transition of a synthetic syllable is presented to one ear while the remainder (the "base") is presented to the opposite ear, listeners report hearing the original syllable in the ear receiving the base--a phenomenon called spectral/temporal fusion by J. E. Cutting (see PA, Vol 56:2174). In the present 2 studies, 19 undergraduates were used to examine some of the factors that may limit the occurrence of fusion in this special situation. It was found that the mere onset (i.e., the 1st pitch pulse, 10 msec in duration) of an isolated, contralateral 3rd formant (F3) transition was sufficient to cue the /da/ga/ distinction in this way. The relative onset times of isolated F3 and base were also varied, and 3 types of F3 segments (50-msec time-varying, 50-msec constant, and 10-msec onset) were compared under both dichotic and diotic presentation. Time-varying F3 segments were superior to constant ones, especially when they lagged behind the base. Diotic performance exceeded dichotic performance, but only when F3 preceded the base, suggesting that upward spread of masking occurred in diotic presentation when F3 coincided with energy in the lower formants. Interestingly, Ss' tolerance of temporal asynchrony (roughly +-50 msec) was about the same in dichotic and diotic conditions, suggesting that the temporal integration mechanism that combines phonetic information from the isolated F3 segment and the base operates similarly in both conditions. |
| Notes |
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