EFFECTS OF RELATIVE SOUND PRESSURE LEVELS OF CROSSING GLIDE COMPONENTS ON THE OCCURENCE OF THE GAP TRANSFER ILLUSION

  • Tuyoshi Kuroda
  • Yoshitaka Nakajima
  • Shuntaro Eguchi
  • Shimpei Tsunashima
  • Tatsuro Yasutake

Abstract

When a long ascending frequency glide with a gap in the temporal middle and a short continuous descending glide cross each other at the temporal midpoint of both glides, observers often report that the gap is perceived in the short, instead of in the long, glide (Nakajima et al., 2000). We examined the effect of the sound-pressure-level difference between crossing glides on the occurrence of this illusion, which we call the gap transfer illusion. A psychophysical experiment revealed that 1) the gap transfer illusion takes place only when the sound-pressure-level difference between the crossing glides is small, and that 2) both the long and the short glide are likely to be perceived as continuous when the short glide is sufficiently more intense than the long glide.

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