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Impaired filtering of irrelevant information in dysphoria: an ERP study

Owens, Max J. and Koster, E.H.W. and Derakhshan, Nazanin (2011) Impaired filtering of irrelevant information in dysphoria: an ERP study. Social cognitive and affective neuroscience 7 (7), pp. 752-763. ISSN 1749-5024.

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Official URL: http://dx.doi.org/10.1093/scan/nsr050

Abstract

Behavioural findings have led to proposals that difficulties in attention and concentration in depression may have their roots in fundamental inhibitory impairments for irrelevant information. These impairments may be associated with reduced capacity to actively maintain relevant information to facilitate goal-directed behaviour. In light of mixed data from behavioural studies, the current study using direct neural measurement, examines whether dysphoric individuals show poor filtering of irrelevant information and reduced working memory (WM) capacity for relevant information. Consistent with previous research, a sustained event-related potential (ERP) asymmetry, termed contra-lateral delay activity (CDA), was observed to be sensitive to WM capacity and the efficient filtering of irrelevant information from visual WM. We found a strong positive correlation between the efficiency of filtering irrelevant items and visual WM capacity. Specifically, dysphoric participants were poor at filtering irrelevant information, and showed reduced WM capacity relative to high capacity non-dysphoric participants. Results support the hypothesis that impaired inhibition is a central feature of dysphoria and are discussed within the framework of cognitive and neurophysiological models of depression.

Item Type: Article
Keyword(s) / Subject(s): attentional control, depression, inhibition, working memory capacity, contra-lateral delay activity, filtering efficiency
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Psychological Sciences
Depositing User: Administrator
Date Deposited: 14 Nov 2011 12:33
Last Modified: 17 Apr 2013 12:21
URI: http://eprints.bbk.ac.uk/id/eprint/4347

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