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Previous Article | Next Article
The Journal of Neuroscience, November 15, 1998, 18(22):9429-9437
Sustained Activity in the Medial Wall during Working Memory Delays
Laurent Petit, Susan M. Courtney, Leslie G. Ungerleider, and James V. Haxby Laboratory of Brain and Cognition, National Institute of Mental Health, Bethesda, Maryland 20892-1366
We have taken advantage of the temporal resolution afforded by functional magnetic resonance imaging (fMRI) to investigate the role played by medial wall areas in humans during working memory tasks. We demarcated the medial motor areas activated during simple manual movement, namely the supplementary motor area (SMA) and the cingulate motor area (CMA), and those activated during visually guided saccadic eye movements, namely the supplementary eye field (SEF). We determined the location of sustained activity over working memory delays in the medial wall in relation to these functional landmarks during both spatial and face working memory tasks. We identified two distinct areas, namely the pre-SMA and the caudal part of the anterior cingulate cortex (caudal-AC), that showed similar sustained activity during both spatial and face working memory delays. These areas were distinct from and anterior to the SMA, CMA, and SEF. Both the pre-SMA and caudal-AC activation were identified by a contrast between sustained activity during working memory delays as compared with sustained activity during control delays in which subjects were waiting for a cue to make a simple manual motor response. Thus, the present findings suggest that sustained activity during working memory delays in both the pre-SMA and caudal-AC does not reflect simple motor preparation but rather a state of preparedness for selecting a motor response based on the information held on-line.
Key words: human; working memory; fMRI; supplementary motor area; pre-SMA; supplementary eye field; anterior cingulum
Copyright © 1998 Society for Neuroscience 0270-6474/98/18229429-09$05.00/0
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