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Robust spatial memory maps encoded by networks with transient connections

Journal Article · · PLoS Computational Biology (Online)
 [1];  [2];  [3]
  1. Rice Univ., Houston, TX (United States). Dept. of Computational and Applied Mathematics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Berkeley Inst. for Data Science
  3. Univ. of Texas McGovern Medical School, Houston, TX (United States)
The spiking activity of principal cells in mammalian hippocampus encodes an internalized neuronal representation of the ambient space-a cognitive map. Once learned, such a map enables the animal to navigate a given environment for a long period. However, the neuronal substrate that produces this map is transient: the synaptic connections in the hippocampus and in the downstream neuronal networks never cease to form and to deteriorate at a rapid rate. How can the brain maintain a robust, reliable representation of space using a network that constantly changes its architecture? We address this question using a computational framework that allows evaluating the effect produced by the decaying connections between simulated hippocampal neurons on the properties of the cognitive map. Using novel Algebraic Topology techniques, we demonstrate that emergence of stable cognitive maps produced by networks with transient architectures is a generic phenomenon. The model also points out that deterioration of the cognitive map caused by weakening or lost connections between neurons may be compensated by simulating the neuronal activity. Lastly, the model explicates the importance of the complementary learning systems for processing spatial information at different levels of spatiotemporal granularity.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1560557
Journal Information:
PLoS Computational Biology (Online), Journal Name: PLoS Computational Biology (Online) Journal Issue: 9 Vol. 14; ISSN 1553-7358
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Replays of spatial memories suppress topological fluctuations in cognitive map journal January 2019
Spatiotemporal Persistent Homology for Dynamic Metric Spaces journal February 2020
The importance of forgetting: Limiting memory improves recovery of topological characteristics from neural data journal September 2018
Replays of spatial memories suppress topological fluctuations in cognitive map preprint January 2018
Spatio-temporal Persistent Homology for Dynamic Metric Spaces text January 2018

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