Components of verbal working memory: Evidence from neuroimaging

Proceedings of the National Academy of Sciences of the United States of America - Tập 95 Số 3 - Trang 876-882 - 1998
Edward E. Smith1, John Jonides1, Christy Marshuetz1, Robert A. Koeppe1
1Department of Psychology, and Division of Nuclear Medicine, University of Michigan, Ann Arbor, MI 48109-1109

Tóm tắt

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 that, when a task requires processing the contents of working memory, the dorsolateral prefrontal cortex is disproportionately activated.

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Thông tin xuất bản

Proceedings of the National Academy of Sciences of the United States of America

Tập 95 Số 3

876-882

Thông tin tác giả