The effect of marker frequency disparity on the discrimination of gap duration in monkeys

Journal/Book: Perception. 1999; 28: 207 Brondesbury Park, London NW2 5Jn, England. Pion Ltd. 437-444.

Abstract: Duration-discrimination thresholds of the silent interval (gap) between two successive tones (markers) were measured in four Japanese monkeys. The task was serial discrimination, and monkeys were required to release the lever when the gap duration decreased from 200 ms. Monkeys successfully acquired the task, and gap thresholds of monkeys were revealed to be larger than previous data with human subjects. Gap thresholds were not affected by marker frequency when the two markers were identical in frequency though the thresholds increased when large frequency differences existed between markers. The effect of marker frequency disparity on gap thresholds in monkeys is discussed in terms of the difficulty in integrating information from discrete frequency channels.

Note: Article Izumi A, Kyoto Univ, Inst Primate Res, Dept Behav & Brain Sci, Inuyama, Aichi 4848506, JAPAN

Keyword(s): AUDITORY STREAM SEGREGATION; STARLINGS STURNUS-VULGARIS; SHORT-TERM-MEMORY; JAPANESE MACAQUES; PERCEPTUAL ORGANIZATION; MACACA-FUSCATA; VARYING SIGNAL; VOCAL EXCHANGE; CEBUS-APELLA; COO CALLS

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