ILLUSORY UNIFICATION OF SIMULTANEOUS TEMPORAL GAPS OF GLIDE TONES THAT ARE APART FROM EACH OTHER IN FREQUENCY

  • Yoshitaka Nakajima
  • Tsuyoshi Kuroda
  • Tomoko Uehara

Abstract

When a temporal gap typically shorter than 50 ms in a frequency glide longer than 1 s isshared by a shorter glide, its perceptual presence in the longer glide can be weakened or lost.In the present study, we conducted an experiment to examine a possibility that this illusion,illusory gap unification, is caused by peripheral processes of the auditory system. A longglide of 3000 ms and two short glides of 300 ms shared an intensity dip of 40 ms in theirtemporal middles. They all ascended or descended together at a rate of 1 oct/s. The middlefrequency of the long glide component was 1000 Hz, and the short glide components were 13semitones lower and higher. Thus, the influence of peripheral interactions between thesecomponents was minimized. The illusion still took place: A majority of eight observersperceived the long glide as completely continuous and the short glides as completely orpartially discontinuous.
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