期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 105, 期 37, 页码 14228-14233出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0802081105
关键词
focus of attention; inferior temporal cortex; working memory; medial temporal lobe; functional magnetic resonance imaging (fMRI)
资金
- National Science Foundation [0520992]
- National Institute of Mental Health [MH60655]
- National Science Foundation Graduate Research Fellowship
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [0520992] Funding Source: National Science Foundation
Behavioral research has led to the view that items in short-term memory can be parsed into two categories: a single item in the focus of attention that is available for immediate cognitive processing and a small set of other items that are in a heightened state of activation but require retrieval for further use. We examined this distinction by using an item-recognition task. The results show that the item in the focus of attention is represented by increased activation in inferior temporal representational cortices relative to other information in short-term memory. Functional connectivity analyses suggest that activation of these inferior temporal regions is maintained via frontal- and posterior-parietal contributions. By contrast, other items in short-term memory demand retrieval mechanisms that are represented by increased activation in the medial temporal lobe and left mid-ventrolateral prefrontal cortex. These results show that there are two distinctly different sorts of access to information in short-term memory, and that access by retrieval operations makes use of neural machinery similar to that used in long-term memory retrieval.
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