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Is a change as good as a rest? Effects of inter-trial contingency and task on concurrent sound segregation

journal contribution
posted on 2023-06-08, 19:33 authored by Benjamin Dyson, Claude Alain
The effects of local and global context on concurrent sound segregation were examined using a mistuned harmonic paradigm. Presented with the same sounds over three conditions, participants were asked to either categorise the incoming complex according to pitch or harmonicity (active listening) or watch a muted subtitled movie of their choice (passive listening). Global context was defined according to task instruction, while local context was defined relative to the repetition or change of harmonicity across trials. An interaction between global and local context in both behavioural and event-related potential measures was found, with participants showing sensitivity to change and repetition in harmonicity when it was task-relevant, in addition to enhanced P3 amplitude for cases where a tuned stimulus changed into a mistuned stimulus over consecutive trials. The data are discussed in terms of current models of concurrent sound perception and how top–down processes might influence these mechanisms.

History

Publication status

  • Published

File Version

  • Published version

Journal

Brain Research

ISSN

0006-8993

Publisher

Elsevier

Volume

1189

Page range

135-144

Department affiliated with

  • Psychology Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2015-01-14

First Compliant Deposit (FCD) Date

2015-01-14

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