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    Dimension- and space-based intertrial effects in visual pop-out search: modulation by task demands for focal-attentional processing

    Krummenacher, J. and Muller, Hermann J. and Zehetleitner, M. and Geyer, T. (2009) Dimension- and space-based intertrial effects in visual pop-out search: modulation by task demands for focal-attentional processing. Psychological Research 73 (2), pp. 186-197. ISSN 0340-0727.

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    Abstract

    Two experiments compared reaction times (RTs) in visual search for singleton feature targets defined, variably across trials, in either the color or the orientation dimension. Experiment 1 required observers to simply discern target presence versus absence (simple-detection task); Experiment 2 required them to respond to a detection-irrelevant form attribute of the target (compound-search task). Experiment 1 revealed a marked dimensional intertrial effect of 34 ms for an target defined in a changed versus a repeated dimension, and an intertrial target distance effect, with an 4-ms increase in RTs (per unit of distance) as the separation of the current relative to the preceding target increased. Conversely, in Experiment 2, the dimension change effect was markedly reduced (11 ms), while the intertrial target distance effect was markedly increased (11 ms per unit of distance). The results suggest that dimension change/repetition effects are modulated by the amount of attentional focusing required by the task, with space-based attention altering the integration of dimension-specific feature contrast signals at the level of the overall-saliency map.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 20 Dec 2010 11:16
    Last Modified: 17 Apr 2013 12:19
    URI: http://eprints.bbk.ac.uk/id/eprint/2500

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