Clone-structured graph representations enable flexible learning and vicarious evaluation of cognitive maps.
Clone-structured graph representations enable flexible learning and vicarious evaluation of cognitive maps.
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DOI:
10.1038/s41467-021-22559-5
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发表时间:
2021-04-22
影响因子:
16.6
通讯作者:
Lázaro-Gredilla M
中科院分区:
文献类型:
--
作者:
George D;Rikhye RV;Gothoskar N;Guntupalli JS;Dedieu A;Lázaro-Gredilla M
Cognitive maps are mental representations of spatial and conceptual relationships in an environment, and are critical for flexible behavior. To form these abstract maps, the hippocampus has to learn to separate or merge aliased observations appropriately in different contexts in a manner that enables generalization and efficient planning. Here we propose a specific higher-order graph structure, clone-structured cognitive graph (CSCG), which forms clones of an observation for different contexts as a representation that addresses these problems. CSCGs can be learned efficiently using a probabilistic sequence model that is inherently robust to uncertainty. We show that CSCGs can explain a variety of cognitive map phenomena such as discovering spatial relations from aliased sensations, transitive inference between disjoint episodes, and formation of transferable schemas. Learning different clones for different contexts explains the emergence of splitter cells observed in maze navigation and event-specific responses in lap-running experiments. Moreover, learning and inference dynamics of CSCGs offer a coherent explanation for disparate place cell remapping phenomena. By lifting aliased observations into a hidden space, CSCGs reveal latent modularity useful for hierarchical abstraction and planning. Altogether, CSCG provides a simple unifying framework for understanding hippocampal function, and could be a pathway for forming relational abstractions in artificial intelligence. Higher-order sequence learning using a structured graph representation - clone-structured cognitive graphs (CSCG) – can explain how the hippocampus learns cognitive maps. CSCG provides novel explanations for transferable schemas and transitive inference in the hippocampus, and for how place cells, splitter cells, lap-cells and a variety of phenomena emerge from the same set of fundamental principles.
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DOI:
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发表时间:
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影响因子:
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影响因子:
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DOI:
10.1126/science.aan8869
发表时间:
2017-10-27
期刊:
Science (New York, N.Y.)
影响因子:
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