Neural correlates of shape–color binding in visual working memory

Parra, Mario A, Della Sala, Sergio, Logie, Robert H and Morcom, Alexa M (2014) Neural correlates of shape–color binding in visual working memory. Neuropsychologia, 52. pp. 27-36. ISSN 0028-3932

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Abstract

The present study addressed an outstanding issue regarding feature binding in working memory (WM): Whether this function engages specific resources relative to those required to process individual features. We investigated the brain regions supporting the encoding and maintenance of features and bindings in a change detection task, in which 22 healthy young volunteers remembered visual arrays of abstract shapes, colors or shape-color bindings while undergoing fMRI. After an unfilled delay they saw a second array and judged whether the features or combination of features presented across the two arrays were the same or different. Temporary retention of feature bindings was found to involve additional cortical regions compared with retaining single features, regardless of whether the number of objects or the number of features differed between feature-only and binding conditions. This binding-specific activation was not consistent with the involvement of a general purpose executive resource. Regions within the parietal, temporal and occipital cortex, but not within the prefrontal cortex or the medial temporal lobe, appear to support the integrated object binding function investigated in this study. Our findings suggest that both individual features and their binding within integrated objects are used to represent complex objects in WM.

Item Type: Article
Keywords: Working memory binding; feature integration; conjunctive representations; unitization; fMRI
Schools and Departments: School of Psychology > Psychology
Depositing User: Sanjeedah Choudhury
Date Deposited: 26 Mar 2019 11:49
Last Modified: 01 Jul 2019 17:45
URI: http://sro.sussex.ac.uk/id/eprint/82806

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