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    The gradual emergence of spatially selective target processing in visual search: from feature-specific to object-based attentional control

    Eimer, Martin and Grubert, Anna (2014) The gradual emergence of spatially selective target processing in visual search: from feature-specific to object-based attentional control. Journal of Experimental Psychology: Human Perception and Performance 40 (5), pp. 1819-1831. ISSN 0096-1523.

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    Abstract

    To dissociate feature-based and object-based stages in the control of spatial attention during visual search, we employed the N2pc component as an electrophysiological marker of attentional object selection. Participants searched for a target object that was defined by a conjunction of color and shape. Some search displays contained the target or a nontarget object that matched either the target color or its shape among 3 nonmatching distractors. In other displays, the target and a partially target-matching nontarget object appeared together. N2pc results demonstrated that the initial stage of attentional object selection is controlled by local feature-specific signals. Attention is allocated in parallel and independently to objects with target-matching features during this early stage, irrespective of whether another target-matching object is simultaneously present elsewhere. From around 250 ms poststimulus, information is integrated across feature dimensions, and spatially selective attentional processing becomes object-based. These findings demonstrate that feature-based and object-based stages of attentional selectivity in visual search can be dissociated in real time. (PsycINFO Database Record (c) 2014 APA, all rights reserved)

    Metadata

    Item Type: Article
    Additional Information: This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.
    Keyword(s) / Subject(s): selective attention, top-down control, visual search, event-related brain potentials, feature-based attention, object-based attention
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Administrator
    Date Deposited: 30 Sep 2014 13:42
    Last Modified: 11 Oct 2016 12:00
    URI: http://eprints.bbk.ac.uk/id/eprint/10637

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