Abstract
The discriminability of short tone bursts differing in frequency was measured in terms of the sensitivity indexd’ as a function of interstimulus interval (ISI). The two stimuli presented on each trial consisted of either 6 or 30 sinusoidal cycles. When the frequency of the first stimulus varied randomly and widely from trial to trial (Experiment 1), discriminability was maximal for an ISI of about 400 msec in the 6-cycles condition and for a significantly longer ISI (of about 1 sec) in the 30-cycles condition. However, when the first stimulus had only two possible frequencies and the second stimulus was fixed (Experiment 2), the optimal ISI appeared to be about 400 msec in both conditions. A final experiment confirmed that, for tone bursts of 30 cycles, the optimal ISI was dependent on the perceptual uncertainty of the first stimulus. These results support the idea that the duration required to perceive the pitch of a sound as accurately as possible may far exceed the duration of the stimulus itself. More importantly, they indicate that the required duration is not a constant.
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Demany, L., Semal, C. The slow formation of a pitch percept beyond the ending time of a short tone burst. Perception & Psychophysics 67, 1376–1383 (2005). https://doi.org/10.3758/BF03193642
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DOI: https://doi.org/10.3758/BF03193642