Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.

Spatial navigation requires the processing of complex, disparate and often ambiguous sensory data. The neurocomputations underpinning this vital ability remain poorly understood. Controversy remains as to whether multimodal sensory information must be combined into a unified representation, consiste...

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Autores principales:	Allen Cheung, David Ball, Michael Milford, Gordon Wyeth, Janet Wiles
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/dc3aabc09924478eb1554f8d92f8a8b4
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spelling	oai:doaj.org-article:dc3aabc09924478eb1554f8d92f8a8b42021-11-18T05:51:05ZMaintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.1553-734X1553-735810.1371/journal.pcbi.1002651https://doaj.org/article/dc3aabc09924478eb1554f8d92f8a8b42012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22916006/?tool=EBIhttps://doaj.org/toc/1553-734Xhttps://doaj.org/toc/1553-7358Spatial navigation requires the processing of complex, disparate and often ambiguous sensory data. The neurocomputations underpinning this vital ability remain poorly understood. Controversy remains as to whether multimodal sensory information must be combined into a unified representation, consistent with Tolman's "cognitive map", or whether differential activation of independent navigation modules suffice to explain observed navigation behaviour. Here we demonstrate that key neural correlates of spatial navigation in darkness cannot be explained if the path integration system acted independently of boundary (landmark) information. In vivo recordings demonstrate that the rodent head direction (HD) system becomes unstable within three minutes without vision. In contrast, rodents maintain stable place fields and grid fields for over half an hour without vision. Using a simple HD error model, we show analytically that idiothetic path integration (iPI) alone cannot be used to maintain any stable place representation beyond two to three minutes. We then use a measure of place stability based on information theoretic principles to prove that featureless boundaries alone cannot be used to improve localization above chance level. Having shown that neither iPI nor boundaries alone are sufficient, we then address the question of whether their combination is sufficient and--we conjecture--necessary to maintain place stability for prolonged periods without vision. We addressed this question in simulations and robot experiments using a navigation model comprising of a particle filter and boundary map. The model replicates published experimental results on place field and grid field stability without vision, and makes testable predictions including place field splitting and grid field rescaling if the true arena geometry differs from the acquired boundary map. We discuss our findings in light of current theories of animal navigation and neuronal computation, and elaborate on their implications and significance for the design, analysis and interpretation of experiments.Allen CheungDavid BallMichael MilfordGordon WyethJanet WilesPublic Library of Science (PLoS)articleBiology (General)QH301-705.5ENPLoS Computational Biology, Vol 8, Iss 8, p e1002651 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5
spellingShingle	Biology (General) QH301-705.5 Allen Cheung David Ball Michael Milford Gordon Wyeth Janet Wiles Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
description	Spatial navigation requires the processing of complex, disparate and often ambiguous sensory data. The neurocomputations underpinning this vital ability remain poorly understood. Controversy remains as to whether multimodal sensory information must be combined into a unified representation, consistent with Tolman's "cognitive map", or whether differential activation of independent navigation modules suffice to explain observed navigation behaviour. Here we demonstrate that key neural correlates of spatial navigation in darkness cannot be explained if the path integration system acted independently of boundary (landmark) information. In vivo recordings demonstrate that the rodent head direction (HD) system becomes unstable within three minutes without vision. In contrast, rodents maintain stable place fields and grid fields for over half an hour without vision. Using a simple HD error model, we show analytically that idiothetic path integration (iPI) alone cannot be used to maintain any stable place representation beyond two to three minutes. We then use a measure of place stability based on information theoretic principles to prove that featureless boundaries alone cannot be used to improve localization above chance level. Having shown that neither iPI nor boundaries alone are sufficient, we then address the question of whether their combination is sufficient and--we conjecture--necessary to maintain place stability for prolonged periods without vision. We addressed this question in simulations and robot experiments using a navigation model comprising of a particle filter and boundary map. The model replicates published experimental results on place field and grid field stability without vision, and makes testable predictions including place field splitting and grid field rescaling if the true arena geometry differs from the acquired boundary map. We discuss our findings in light of current theories of animal navigation and neuronal computation, and elaborate on their implications and significance for the design, analysis and interpretation of experiments.
format	article
author	Allen Cheung David Ball Michael Milford Gordon Wyeth Janet Wiles
author_facet	Allen Cheung David Ball Michael Milford Gordon Wyeth Janet Wiles
author_sort	Allen Cheung
title	Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
title_short	Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
title_full	Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
title_fullStr	Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
title_full_unstemmed	Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
title_sort	maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/dc3aabc09924478eb1554f8d92f8a8b4
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Maintaining a cognitive map in darkness: the need to fuse boundary knowledge with path integration.

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