How many streams? (Michael Norris )

Subject: How many streams?
From:    Michael Norris  <michaeln(at)CSEE.UQ.EDU.AU>
Date:    Thu, 9 Sep 1999 11:14:15 +1000

Dear List, The gradual build and decay of auditory streaming has been measured, and the persistence of stream biasing is reported to be about 4 seconds [1][2][3], but once streams have formed, what happens when a tone sequence in a different frequency range is added to the pattern? If you take four tones, A,B,C,D in two clusters, separated by say, 3, 7 and 3 semitones (similar to stimuli used in [1]) 0s 4s 8s 12s A/B - _ - _ - _ - _ - _ - _ - _ - _ - _ - _ C/D - _ - _ - _ - _ - _ - _ - (numbers of tones not to scale in this diagram; labels 1, 2, &c are 4sec apart) 0s: A and B form one stream 4s: A and B split into two streams 8s: Now what? - Are there one, two, or three streams? Does the whole system reset and form a single stream, or do C and D form one stream while A and B rejoin to form another, or do A and B remain segregated while C and D begin fused. 12: Now do we have two streams or four? Can the presence of C and D prevent A and B from segregating? any leads/references appreciated, thanks, Michael Norris michaeln(at) ----------------------- /\/\/\/- ------------------------------------- [1] A.S. Bregman (1978) "Auditory streaming is cumulative" Journal of Experimental Psychology: Human Perception and Performance 4:3,380-387 [2] M.W. Beauvois and R. Meddis (1997) "Time decay of auditory stream biasing" Perception and Psychophysics 59:1,81-86 [3] W.L. Rogers and A.S. Bregman (1998) "Cumulation of the tendency to segregate auditory streams: Resetting by changes in location and loudness" Perception and Psychophysics 60:7,1216-1227

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