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

Dyson, Benjamin J and Alain, Claude (2008) Is a change as good as a rest? Effects of inter-trial contingency and task on concurrent sound segregation. Brain Research, 1189. pp. 135-144. ISSN 0006-8993

[img] PDF - Published Version
Restricted to SRO admin only

Download (936kB)

Abstract

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.

Item Type: Article
Schools and Departments: School of Psychology > Psychology
Subjects: Q Science > QZ Psychology
Depositing User: Ben Dyson
Date Deposited: 14 Jan 2015 13:51
Last Modified: 08 Mar 2017 08:13
URI: http://sro.sussex.ac.uk/id/eprint/52147

View download statistics for this item

📧 Request an update