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    Differential brain mechanisms for processing distracting information in task-relevant and-irrelevant dimensions in visual search

    Wei, P. and Yu, H. and Muller, Hermann and Pollmann, S. and Zhou, X. (2018) Differential brain mechanisms for processing distracting information in task-relevant and-irrelevant dimensions in visual search. Human Brain Mapping 40 (1), pp. 110-124. ISSN 1065-9471.

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    Wei_Differential brain mechanisms for processing distracting information in task relevant and irrelevant dimensions in visual search.pdf - Author's Accepted Manuscript
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    Abstract

    A crucial function of our goal-directed behavior is to select task-relevant targets among distractor stimuli, some of which may share properties with the target and thus compete for attentional selection. Here, by applying functional magnetic resonance imaging (fMRI) to a visual search task in which a target was embedded in an array of distractors that were homogeneous or heterogeneous along the task-relevant (orientation or form) and/or task-irrelevant (color) dimensions, we demonstrate that for both (orientation) feature search and (form) conjunction search, the fusiform gyrus is involved in processing the task-irrelevant color information, while the bilateral frontal eye fields (FEF), the cortex along the left intraparietal sulcus (IPS), and the left junction of intraparietal and transverse occipital sulci (IPTO) are involved in processing task-relevant distracting information, especially for target-absent trials. Moreover, in conjunction (but not in feature) search, activity in these frontoparietal regions is affected by stimulus heterogeneity along the task-irrelevant dimension: heterogeneity of the task-irrelevant information increases the activity in these regions only when the task-relevant information is homogeneous, not when it is heterogeneous. These findings suggest that differential neural mechanisms are involved in processing task-relevant and task- irrelevant dimensions of the searched-for objects. In addition, they show that the top-down task set plays a dominant role in determining whether or not task-irrelevant information can affect the processing of the task-relevant dimension in the frontoparietal regions.

    Metadata

    Item Type: Article
    Additional Information: This is the peer reviewed version of the article, which has been published in final form at the link above. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
    Keyword(s) / Subject(s): conjunction search, feature search, fMRI, task‐irrelevant, task‐relevant, visual search
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Hermann Muller
    Date Deposited: 22 May 2019 15:39
    Last Modified: 22 May 2019 15:39
    URI: http://eprints.bbk.ac.uk/id/eprint/27065

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