The tendency to hear a sequence of alternating low (L) and high (H) frequency tones as two streams can be increased by a preceding induction sequence, even one composed only of same-frequency tones. Four experiments used such an induction sequence (10 identical L tones) to promote segregation in a shorter test sequence comprising L and H tones. Previous studies have shown that the build-up of stream segregation is usually reduced greatly when a sudden change in acoustic properties distinguishes all of the induction tones from their test-sequence counterparts. Experiment 1 showed that a single deviant tone, created by altering the final inducer (in frequency, level, duration, or replacement with silence) reduced reported segregation, often substantially. Experiment 2 partially replicated this finding, using changes in temporal discrimination as a measure of streaming. Experiments 3 and 4 varied the size of a frequency change applied to the deviant tone; the extent of resetting varied with size only gradually. The results suggest that resetting begins to occur once the change is large enough to be noticeable. Since the prior inducers always remained unaltered in the deviant-tone conditions, it is proposed that a single change actively resets the build-up evoked by the induction sequence.
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November 2010
November 24 2010
Build-up of the tendency to segregate auditory streams: Resetting effects evoked by a single deviant tone
Nicholas R. Haywood;
Nicholas R. Haywood
a)
Psychology, School of Life and Health Sciences,
Aston University
, Birmingham B4 7ET, United Kingdom
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Brian Roberts
Brian Roberts
Psychology, School of Life and Health Sciences,
Aston University
, Birmingham B4 7ET, United Kingdom
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a)
Author to whom correspondence should be addressed. Present address: Faculty of Medicine, School of Audiology and Speech Sciences, University of British Columbia, 2177 Wesbrook Mall, Vancouver, British Columbia V6T 1Z3, Canada. Electronic mail: nhaywood@audiospeech.ubc.ca
J. Acoust. Soc. Am. 128, 3019–3031 (2010)
Article history
Received:
February 11 2010
Accepted:
August 23 2010
Citation
Nicholas R. Haywood, Brian Roberts; Build-up of the tendency to segregate auditory streams: Resetting effects evoked by a single deviant tone. J. Acoust. Soc. Am. 1 November 2010; 128 (5): 3019–3031. https://doi.org/10.1121/1.3488675
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