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The redundant-signals paradigm and preattentive visual processing.

Zehetleitner, M. and Muller, Hermann J. and Krummenacher, J. (2008) The redundant-signals paradigm and preattentive visual processing. Frontiers in bioscience : a journal and virtual library 13 , pp. 5279-5293. ISSN 1093-4715.

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Physiological and cognitive models of vision agree that the pre-attentive processing of visual stimuli is organized in a parallel and segregated fashion. However, several incompatible models have been proposed for the subsequent processing stages. They differ in their assumptions about architecture (serial, parallel, or coactive/integrative), stopping-rules (self-terminating, or exhaustive), spatial specificity of saliency signal coding (signal pooling across locations, or spatially distinct processing), and dependency of target detection on the prior allocation of attention (pre-attentive, or post-selective). We review how studies employing the redundant-signals paradigm in visual pop-out search contribute to discerning between the different assumptions. We find strong support for the notion of a saliency map, into which feature contrast signals are pooled, and especially the dimension weighting account (1) receives further support: Instead of a priming mechanism that could increase weights for several dimensions independently, evidence favors a weighting mechanism that effectively limits the total weight available for allocation to the various dimensions through competitive interactions, whereby increasing the weight for one dimension goes along with decreasing the weights for other dimensions.

Item Type: Article
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Psychological Sciences
Depositing User: Administrator
Date Deposited: 17 Dec 2010 13:55
Last Modified: 17 Apr 2013 12:19

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