The role of the pulvinar in distractor processing and visual search

Authors

  • Hendrick Strumpf,

    1. Leibniz Institute for Neurobiology, Magdeburg, Germany
    2. Department of Neurology, University of Magdeburg, Magdeburg, Germany
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  • George R. Mangun,

    1. Department of Psychology, Center for Mind and Brain, University of California, Davis, CA
    2. Department of Neurology, Center for Mind and Brain, University of California, Davis, CA
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  • Carsten N. Boehler,

    1. Leibniz Institute for Neurobiology, Magdeburg, Germany
    2. Department of Neurology, University of Magdeburg, Magdeburg, Germany
    3. Department of Experimental Psychology, Ghent University, 9000 Ghent, Belgium
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  • Christian Stoppel,

    1. Leibniz Institute for Neurobiology, Magdeburg, Germany
    2. Department of Neurology, University of Magdeburg, Magdeburg, Germany
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  • Mircea A. Schoenfeld,

    1. Leibniz Institute for Neurobiology, Magdeburg, Germany
    2. Department of Neurology, University of Magdeburg, Magdeburg, Germany
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  • Hans-Jochen Heinze,

    1. Leibniz Institute for Neurobiology, Magdeburg, Germany
    2. Department of Neurology, University of Magdeburg, Magdeburg, Germany
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  • Jens-Max Hopf

    Corresponding author
    1. Leibniz Institute for Neurobiology, Magdeburg, Germany
    2. Department of Neurology, University of Magdeburg, Magdeburg, Germany
    • Leibniz Institute for Neurobiology and Otto-von-Guericke-University of Magdeburg, Leipziger Strasse 44, 39120 Magdeburg, Germany
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Abstract

The pulvinar nuclei of the thalamus are hypothesized to coordinate attentional selection in the visual cortex. Different models have, however, been proposed for the precise role of the pulvinar in attention. One proposal is that the pulvinar mediates shifts of spatial attention; a different proposal is that it serves the filtering of distractor information. At present, the relation between these possible operations and their relative importance in the pulvinar remains unresolved. We address this issue by contrasting these proposals in two fMRI experiments. We used a visual search paradigm that permitted us to dissociate neural activity reflecting shifts of attention from activity underlying distractor filtering. We find that distractor filtering, but not the operation of shifting attention, is associated with strong activity enhancements in dorsal and ventral regions of the pulvinar as well as in early visual cortex areas including the primary visual cortex. Our observations indicate that distractor filtering is the preponderant attentional operation subserved by the pulvinar, presumably mediated by a modulation of processing in visual areas where spatial resolution is sufficiently high to separate target from distractor input. Hum Brain Mapp, 2013. © 2012 Wiley Periodicals, Inc.

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