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Auditory Temporal Discrimination from the Perspective of Gap

In: Timing & Time Perception
Authors:
Shuji Mori Department of Informatics, Faculty of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

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Hyunsoo Cho Department of Informatics, Faculty of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

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Willy Wong Edward S. Rogers Department of Electrical and Computer Engineering, and Institute of Biomedical Engineering, University of Toronto, 10 King’s College Rd, Toronto, ON, M5S3G4, Canada

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Abstract

Gap detection refers to the perceptual ability to detect brief silences in auditory stimuli. This study investigates temporal discrimination in relation to the perception and processing of gaps. Experiments were conducted to measure gap discrimination thresholds using markers of different frequencies. The results reveal that the threshold for gap discrimination varies depending on the frequency separation between the leading and trailing markers. Notably, when the markers have identical frequencies, the threshold increases monotonically up to the study limit of 100 ms, with a slope that deviates from Weber’s law. To better comprehend these findings, a previously proposed neural model of gap detection was expanded to account for discrimination. This model shows good compatibility with the experimental results and is able to unify gap detection with temporal discrimination. The model also provides a possible mechanism for the pacemaker in the internal clock hypothesis.

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