PMID: 9448254Mar 14, 1998Paper

Components of verbal working memory: evidence from neuroimaging

Proceedings of the National Academy of Sciences of the United States of America
E E SmithR A Koeppe

Abstract

We review research on the neural bases of verbal working memory, focusing on human neuroimaging studies. We first consider experiments that indicate that verbal working memory is composed of multiple components. One component involves the subvocal rehearsal of phonological information and is neurally implemented by left-hemisphere speech areas, including Broca's area, the premotor area, and the supplementary motor area. Other components of verbal working memory may be devoted to pure storage and to executive processing of the contents of memory. These studies rest on a subtraction logic, in which two tasks are imaged, differing only in that one task presumably has an extra process, and the difference image is taken to reflect that process. We then review studies that show that the previous results can be obtained with experimental methods other than subtraction. We focus on the method of parametric variation, in which a parameter that presumably reflects a single process is varied. In the last section, we consider the distinction between working memory tasks that require only storage of information vs. those that require that the stored items be processed in some way. These experiments provide some support for the hypothesis th...Continue Reading

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Citations

Jul 11, 2006·Psychopharmacology·Paul P AllenPhilip K McGuire
Jun 19, 2004·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·L M JonkmanH van Engeland
Mar 10, 2004·NeuroImage·Xingchang WeiLawrence P Panych
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