Sequence disambiguation and pattern completion by cooperation between autoassociative and heteroassociative memories of functionally divided hippocampal CA3

Authors:
Toshikazu Samura;Motonobu Hattori;Shun Ishizaki
Affiliations:
Graduate School of Media and Governance, Keio University, 5322 Endo, Fujisawa-shi, Kanagawa 252-8520, Japan;Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu-shi, Yamanashi 400-8511, Japan;Graduate School of Media and Governance, Keio University, 5322 Endo, Fujisawa-shi, Kanagawa 252-8520, Japan
Venue:
Neurocomputing
Year:
2008

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Abstract

The hippocampus memorizes event sequences and some events are shared by a few sequences. When a sequence is retrieved from the linked sequences, ambiguity of sequences becomes a serious problem because the shared events have some possible ways to retrieve other events. We have focused on location dependency elucidated from the hippocampus and suggested that CA3 is functionally divided into autoassociative and heteroassociative memories. Computer simulation results show that the functionally divided CA3 concurrently enables both sequence disambiguation and pattern completion. Consequently, it demonstrates that cooperation between both memories of CA3 brings out the abilities of sequence disambiguation and pattern completion in the hippocampus.