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    Visual working memory load disrupts template-guided attentional selection during visual search

    Berggren, Nick and Eimer, Martin (2018) Visual working memory load disrupts template-guided attentional selection during visual search. Journal of Cognitive Neuroscience 110 (2), pp. 357-371. ISSN 0898-929X. (In Press)

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    Abstract

    Mental representations of target features (attentional templates) control the selection of candidate target objects in visual search. The question where templates are maintained remains controversial. We employed the N2pc component as an electrophysiological marker of template-guided target selection to investigate whether and under which conditions templates are held in visual working memory (vWM). In two experiments, participants memorized one or four shapes (low versus high vWM load) before either being tested on their memory or performing a visual search task. When targets were defined by one of two possible colours (e.g., red or green), target N2pcs were delayed with high vWM load. This suggests that the maintenance of multiple shapes in vWM interfered with the activation of colour-specific search templates, supporting the hypothesis that these templates are held in vWM. This was the case despite participants always searching for the same two target colours. In contrast, the speed of target selection in a task where a single target colour remained relevant throughout was unaffected by concurrent load, indicating that a constant search template for a single feature may be maintained outside vWM in a different store. Additionally, early visual N1 components to search and memory test displays were attenuated under high load, suggesting a competition between external and internal attention. The size of this attenuation predicted individual vWM performance. These results provide new electrophysiological evidence for impairment of top-down attentional control mechanisms by high vWM load, demonstrating that vWM is involved in the guidance of attentional target selection during search.

    Metadata

    Item Type: Article
    School: School of Science > Psychological Sciences
    Depositing User: Martin Eimer
    Date Deposited: 12 Jul 2018 15:56
    Last Modified: 09 Feb 2021 16:26
    URI: https://eprints.bbk.ac.uk/id/eprint/23116

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