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Redundancy gains in pop-out visual search are determined by top-down task set: behavioral and electrophysiological evidence

Grubert, A. and Krummenacher, J. and Eimer, Martin (2011) Redundancy gains in pop-out visual search are determined by top-down task set: behavioral and electrophysiological evidence. Journal of Vision 11 (14), ISSN 1534-7362.

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Official URL: http://dx.doi.org/10.1167/11.14.10

Abstract

We combined behavioral and electrophysiological measures to find out whether redundancy gain effects in pop-out visual search are exclusively determined by bottom-up salience or are modulated by top-down task search goals. Search arrays contained feature singletons that could be defined in a single dimension (color or shape) or redundantly in both dimensions. In the baseline condition, both color and shape were task-relevant, and behavioral redundancy gain effects were accompanied by an earlier onset of the N2pc component for redundant as compared to single-dimension targets. This demonstrates that redundancy gains are generated at an early visual–perceptual level of processing. In the color target and shape target conditions, only one dimension was task-relevant, while the other could be ignored. In these two conditions, behavioral and electrophysiological redundancy gains were eliminated. We conclude that redundant-signals effects in pop-out visual search are not driven by bottom-up salience but are instead strongly dependent on top-down task set.

Item Type: Article
Keyword(s) / Subject(s): visual search, visual salience, top-down control, ERPs, N2pc, attention
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Psychological Sciences
Depositing User: Administrator
Date Deposited: 16 Jan 2012 13:55
Last Modified: 17 Apr 2013 12:22
URI: http://eprints.bbk.ac.uk/id/eprint/4558

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