JUDGMENT OF PERCEPTUAL SYNCHRONY BETWEEN TWO PULSES AND ITS RELATION TO THE COCHLEAR DELAYS

  • Eriko Aiba
  • Minoru Tsuzaki
  • Satomi Tanaka
  • Masashi Unoki

Abstract

This study investigates whether the delay caused in the course of wave propagation along the basilar membrane of the cochlea (the cochlear delay) significantly affects the perceptual judgment of the synchronization of two sounds. An experiment was conducted to detect asynchrony using two types of short chirp against a pulse. A compensatory delay chirp was designed for the peaks of the basilar membrane motion to be aligned. An enhanced delay chirp had an enhanced delay pattern that follows the assumed cochlear delay. The pulse had a cosine phase relation, and as a result, it had an intrinsic cochlear delay at the auditory peripheral. The result suggests that the auditory system tends to be more “tolerant†when the lower components arrive after the higher components, as happens for a pulse.

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