Journal
COGNITIVE BRAIN RESEARCH
Volume 20, Issue 2, Pages 194-205Publisher
ELSEVIER
DOI: 10.1016/j.cogbrainres.2004.02.008
Keywords
attention-based rehearsal; spatial working memory; fMRI
Funding
- NIA NIH HHS [AG13483] Funding Source: Medline
- NIMH NIH HHS [R01 MH064498-01A2, MH064498] Funding Source: Medline
- NINDS NIH HHS [NS01762] Funding Source: Medline
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Rehearsal in human spatial working memory is accomplished, in part, via covert shifts of spatial selective attention to memorized locations (attention-based rehearsal). We addressed two outstanding questions about attention-based rehearsal: the topography of the attention-based rehearsal effect, and the mechanism by which it operates. Using event-related AM and a procedure that randomized the presentation of trials with delay epochs that were either filled with a flickering checkerboard or unfilled, we localized the effect to extrastriate areas 18 and 19, and confirmed its absence in striate cortex. Delay-epoch activity in these extrastriate regions, as well as in superior parietal lobule and intraparietal sulcus, was also lateralized on unfilled trials, suggesting that attention-based rehearsal produces a baseline shift in areas representing the to-be-remembered location in space. No frontal regions (including frontal eye fields) demonstrated lateralized activity consistent with a role in attention-based rehearsal. (C) 2004 Elsevier B.V. All rights reserved.
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