Stream biasing by different induction sequences: Evaluating stream capture as an account of the segregation-promoting effects of constant-frequency inducers

Rajasingam, Saima L., Summers, Robert J. and Roberts, Brian (2018). Stream biasing by different induction sequences: Evaluating stream capture as an account of the segregation-promoting effects of constant-frequency inducers. Journal of the Acoustical Society of America, 144 (6), pp. 3409-3420.

Abstract

Stream segregation for a test sequence comprising high-frequency (H) and low-frequency (L) pure tones, presented in a galloping rhythm, is much greater when preceded by a constant-frequency induction sequence matching one subset than by an inducer configured like the test sequence; this difference persists for several seconds. It has been proposed that constant-frequency inducers promote stream segregation by capturing the matching subset of test-sequence tones into an on-going, pre-established stream. This explanation was evaluated using 2-s induction sequences followed by longer test sequences (12–20 s). Listeners reported the number of streams heard throughout the test sequence. Experiment 1 used LHL– sequences and one or other subset of inducer tones was attenuated (0–24 dB in 6-dB steps, and 1). Greater attenuation usually caused a progressive increase in segregation, towards that following the constant-frequency inducer. Experiment 2 used HLH– sequences and the L inducer tones were raised or lowered in frequency relative to their test-sequence counterparts (DfI¼ 0, 0.5, 1.0, or 1.5 DfT). Either change greatly increased segregation. These results are concordant with the notion of attention switching to new sounds but contradict the stream-capture hypothesis, unless a “proto-object” corresponding to the continuing subset is assumed to form during the induction sequence.

Publication DOI: https://doi.org/10.1121/1.5082300
Dataset DOI: https://doi.org/10.17036/researchdata.aston.ac.uk.00000390
Divisions: Life & Health Sciences > Psychology
Life & Health Sciences
Additional Information: © 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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Related URLs: http://asa.scit ... .1121/1.5082300 (Publisher URL)
Published Online Date: 2018-12-20
Authors: Rajasingam, Saima L.
Summers, Robert J. ( 0000-0003-4857-7354)
Roberts, Brian ( 0000-0002-4232-9459)

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