Cited by 312Memory and Neural MechanismsSpatial Cognition and NavigationNeurogenesis and neuroplasticity mechanisms

A Multiplexed, Heterogeneous, and Adaptive Code for Navigation in Medial Entorhinal Cortex

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Hardcastle, Kiah, Maheswaranathan, Niru, Ganguli, Surya, Giocomo, Lisa M.·2017·Neuron

Abstract

Medial entorhinal grid cells display strikingly symmetric spatial firing patterns. The clarity of these patterns motivated the use of specific activity pattern shapes to classify entorhinal cell types. While this approach successfully revealed cells that encode boundaries, head direction, and running speed, it left a majority of cells unclassified, and its pre-defined nature may have missed unconventional, yet important coding properties. Here, we apply an unbiased statistical approach to search for cells that encode navigationally relevant variables. This approach successfully classifies the majority of entorhinal cells and reveals unsuspected entorhinal coding principles. First, we find a high degree of mixed selectivity and heterogeneity in superficial entorhinal neurons. Second, we discover a dynamic and remarkably adaptive code for space that enables entorhinal cells to rapidly encode navigational information accurately at high running speeds. Combined, these observations advance our current understanding of the mechanistic origins and functional implications of the entorhinal code for navigation. VIDEO ABSTRACT.

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Crossref · 10.1016/j.neuron.2017.03.025

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  • Remapping comprised discrete transitions between aligned neural activity manifolds, each representing a distinct map of an unchanging virtual reality 1D environment.

    “Remapping comprised discrete transitions between aligned neural activity manifolds, which each represented a distinct map of an unchanging, virtual reality 1D environment (Figure 1C-D).”
  • Remapping was correlated with transient decreases in running speed, which could correspond to discrete changes in latent state.

    “Remapping was correlated with transient decreases in running speed (Figure 1B), which could correspond to discrete changes in latent state (such as shifts in arousal, task engagement, or other behavioral states).”
  • These task constraints are sufficient to organize randomly initialized synaptic weights into a network model that qualitatively reproduces the remapping dynamics and representational geometry observed in the entorhinal cortex.

    “Thus, these task constraints are sufficient to organize randomly initialized synaptic weights into a network model that qualitatively reproduces the remapping dynamics and representational geometry that Low et al. observed in the entorhinal cortex.26”
  • Procrustes shape analysis demonstrated that the rings were more aligned in high-dimensional activity space than expected by chance for all trained models, such that position along one ring matched position on the second ring.

    “As in Low et al., 26 we used Procrustes shape analysis to demonstrate that these rings were more aligned in high-dimensional activity space than expected by chance for all trained models, such that the position along one ring matched the position on the second ring (Figure 1J).”
  • A new analysis of experimental data from Low et al. found a similar modular structure in neural activity from a subset of sessions with more than two stable spatial maps.

    “Furthermore, we performed a new analysis of experimental data published in Low et al. 26 and found a similar modular structure in neural activity from a subset of sessions with more than two stable spatial maps.”

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Authors
Hardcastle, K., Maheswaranathan, N., Ganguli, S., & Giocomo, L. M.
Affiliations
Stanford Medicine (US)
Corresponding author
  • Hardcastle, Kiah
  • Giocomo, Lisa M.
Venue
Neuron
Publisher
Elsevier BV
Published
2017-04
Volume
94
Issue
2
Pages
375-387.e7
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2605235639
Cited by
312
References
71
Citations by year
2026: 21 · 2025: 36 · 2024: 36 · 2023: 42 · 2022: 33 · 2021: 31 · 2020: 30 · 2019: 42 · 2018: 32 · 2017: 8
FWCI
17.58
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • The New York Stem Cell Foundation
  • James S. McDonnell Foundation
  • NIMH (MH106475)
  • Klingenstein-Simons Fellowship
  • Bio-X Interdisciplinary Initiatives Program
  • Simons Foundation
  • Burroughs-Wellcome
  • Alfred P. Sloan Foundation
  • McKnight Foundation
  • Office of Naval Research (N00014-16-1-2206)
  • NSF-IGERT from the Stanford MBC Program
  • Stanford Interdisciplinary Graduate Fellowship
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Physical Sciences › Engineering › Automotive Engineering › Spatial Cognition and Navigation
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
medial entorhinal cortex, grid cells, spatial coding, mixed selectivity, neuronal heterogeneity, navigation, head direction, running speed, boundary cells, hippocampal formation
MeSH terms
Action Potentials, Animals, Female, Head, Male, Mice, Inbred C57BL, Models, Neurological, Motor Activity, Neurons, Space Perception, Theta Rhythm, Entorhinal Cortex

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