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| Research article summary (published 27 Feb 2003): |
Roles of dynamic linkage of stable attractors across cortical networks in recalling long-term memory.
Full Abstract
We propose a neural network model for a category-association task. By simulating the model, neuronal relevance of cortical interactions to recalling long-term memory was investigated. The model consists of the left and right hemispheres, each of which has IT (inferotemporal cortex) and PC (prefrontal cortex) networks. Information about visual features and their categories were encoded into point attractors of the IT and PC networks, respectively. In the task, the IT network of the right hemisphere was stimulated with a cue feature. After a delay period, the IT network of the left hemisphere was simultaneously stimulated with the choice feature and an irrelevant feature. The cue and choice features belong to the same category, while the irrelevant feature belongs to another category. To complete the task, the IT network must select the point attractor corresponding to the choice feature. We demonstrate that the top-down pathway (PC-to-IT) triggers the retrieval of long-term memory of the choice feature from the IT, and the bottom-up pathway (IT-to-PC) contributes to the maintenance of the retrieved memory during the delay period. The key mechanism for the retrieval and maintenance of that memory is the dynamic linkage of attractors across separate cortical networks. We show that a single hemisphere is sufficient for the memory retrieval, but it is advantageous to use the two hemispheres because the retrieved memory is thereby retained with greater reliability until the brain chooses the choice feature.
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Author information
Author/s: Hoshino, Osamu (O); Zheng, MeiHong (M); Kuroiwa, Kazuharu (K);
Affiliation: Department of Human Welfare Engineering, Oita University, 700 Dannoharu, Japan. hoshino(-atsign-)cc.oita-u.ac.jp
Journal and publication information
Publication Type: Journal Article
Journal: Biological cybernetics (Biol Cybern), published in Germany. (Language: eng)
Reference: 2003-Mar; vol 88 (issue 3) : pp 163-76
Dates: Created 2003/03/20; Completed 2003/05/30; Revised 2006/11/15;
PMID: 12647224, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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