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Updated: Aug 4, 2025

A Two-interval Forced-choice Task for Multisensory Comparisons
Published on: November 9, 2018
Perceptual simultaneity range for two dichotically presented pure tones with frequency separation below 0.5 Bark
Satoshi Okazaki1, Makoto Ichikawa2, Minoru Tsuzaki3
1Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan.
Abstract:
The perceptual simultaneity range for two diotically presented tones increases with decreasing frequency separation of the two tones from approximately 0.5 Bark. As the present study of two frequency regions shows, this effect is not observed when the two tones are not presented to the same ear, i.e., presented dichotically. Since the increase in simultaneity is only observed when the tones are presented to the same ear, it is possible that it reflects the time-frequency uncertainty within a cochlear filter.
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