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    Perceptual basis of redundancy gains in visual pop-out search

    Tollner, T. and Zehetleitner, M. and Krummenacher, J. and Muller, Hermann J. (2010) Perceptual basis of redundancy gains in visual pop-out search. Journal of Cognitive Neuroscience 23 (1), pp. 137-150. ISSN 0898-929X.

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    The redundant-signals effect (RSE) refers to a speed-up of RT when the response is triggered by two, rather than just one, response-relevant target elements. Although there is agreement that in the visual modality RSEs observed with dimensionally redundant signals originating from the same location are generated by coactive processing architectures, there has been a debate as to the exact stage(s)—preattentive versus postselective—of processing at which coactivation arises. To determine the origin(s) of redundancy gains in visual pop-out search, the present study combined mental chronometry with electrophysiological markers that reflect purely preattentive perceptual (posterior-contralateral negativity [PCN]), preattentive and postselective perceptual plus response selection-related (stimulus-locked lateralized readiness potential [LRP]), or purely response production-related processes (response-locked LRP). As expected, there was an RSE on target detection RTs, with evidence for coactivation. At the electrophysiological level, this pattern was mirrored by an RSE in PCN latencies, whereas stimulus-locked LRP latencies showed no RSE over and above the PCN effect. Also, there was no RSE on the response-locked LRPs. This pattern demonstrates a major contribution of preattentive perceptual processing stages to the RSE in visual pop-out search, consistent with parallel-coactive coding of target signals in multiple visual dimensions


    Item Type: Article
    School: School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 17 Dec 2010 14:28
    Last Modified: 17 Apr 2013 12:19


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