Effects of time intervals and tone durations on auditory stream segregation

Author(s): Ahad, P. A., Crum, P. A. C., OReilly, J.

Journal/Book: Percept Psychophys. 2000; 62: 1710 Fortview Rd, Austin, TX 78704, USA. Psychonomic Soc Inc. 626-636.

Abstract: Adult listeners rated the difficulty of hearing a single coherent stream in a sequence of high (H) and low (L) tones that alternated in a repetitive galloping pattern (HLH-HLH-HLH...). They could hear the gallop when the sequence was perceived as a single stream, but when it segregated into two sub-streams, they heard H-H-... In one stream and L-L-... In the other. The onset-to-onset time of the tones. Their duration, the interstimulus interval (ISI) between tones of the same frequency, and the frequency separation between H and L tones were varied. Subjects' ratings on a 7-point scale showed that the well-known effect of speed's increasing stream segregation is primarily due to its effect on the ISI between tones in the same frequency region. This has implications for several theories of streaming.

Note: Article Bregman AS, McGill Univ, Dept Psychol, 1205 Dr Penfield Ave, Montreal, PQ H3A 1B1, CANADA

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