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Consolidation time affects performance and neural activity during visual working memory

Knöchel, Christian, Oertel-Knöchel, Viola, Bittner, Robert, Stäblein, Michael, Heselhaus, Vera, Prvulovic, David, Fußer, Fabian, Karakaya, Tarik, Pantel, Johannes, Maurer, Konrad and Linden, David Edmund Johannes 2015. Consolidation time affects performance and neural activity during visual working memory. Psychiatry Research: Neuroimaging 231 (1) , pp. 33-41. 10.1016/j.pscychresns.2014.10.025

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Abstract

We tested the effects of variation of stimulus onset asynchrony (SOA) on visual working memory (WM) performance across different load levels and the underlying brain activation patterns using functional magnetic resonance imaging (fMRI) in 48 healthy participants. Participants were instructed to memorise arrays of coloured squares and had to perform a match/non-match judgement on a probe stimulus after a jittered delay. We presented visual pattern masks at four SOAs after the offset of the memory array (100 ms, 200 ms, 400 ms, and 800 ms). Memory performance decreased with increased load and shortened SOA. Brain activation data showed significant effects of load (during encoding and retrieval), SOA (retrieval) and an interaction of load by SOA (encoding), mainly in frontal and parietal areas. There was also a direct relationship between successfully stored items and activation in the right inferior parietal lobule and the left middle frontal gyrus. The neurobehavioral results suggest that the frontal regions, together with the inferior parietal lobe, are associated with successful WM performance, especially under the most challenging conditions of high load and short SOAs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Medicine
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: R Medicine > R Medicine (General)
R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Uncontrolled Keywords: Working memory; Stimulus onset asynchrony (SOA); Encoding; Memory retrieval; Functional magnetic resonance imaging (fMRI)
Publisher: Elsevier
ISSN: 0925-4927
Last Modified: 04 Jun 2017 08:15
URI: http://orca.cf.ac.uk/id/eprint/74808

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