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Related Experiment Video

Updated: May 19, 2026

Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex

Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex

Published on: March 28, 2012

Grid alignment in entorhinal cortex.

Bailu Si¹, Emilio Kropff, Alessandro Treves

¹Sector of Cognitive Neuroscience, International School for Advanced Studies, via Bonomea 265, 34136 Trieste, Italy. bailusi@sissa.it

Biological Cybernetics

|August 16, 2012

Summary

This summary is machine-generated.

Grid alignment in the medial entorhinal cortex (mEC) arises from network interactions and behavioral influences. Spontaneous pattern formation creates aligned, context-invariant spatial representations, with ellipse shape influenced by movement speed anisotropy.

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Last Updated: May 19, 2026

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Area of Science:

Neuroscience
Computational Neuroscience
Spatial Navigation

Background:

Medial entorhinal cortex (mEC) neurons exhibit grid-like spatial firing patterns crucial for navigation.
Recent studies suggest these grid patterns are often elliptical and their axes align, with ellipses orienting along preferred directions.

Purpose of the Study:

To investigate if grid alignment and ellipse orientation are linked phenomena.
To determine if grid alignment arises from single-unit mechanisms or network interactions.
To model the spontaneous emergence of conjunctive grid-by-head-direction cells in rodent mEC.

Main Methods:

Refinement of a single-unit adaptation model for grid formation.
Simulation of spontaneous emergence of conjunctive grid-by-head-direction cells in mEC layers III, V, and VI.
Inclusion of head-direction (HD) modulation and analysis of behavioral anisotropy (running direction and speed) in simulated exploration.

Main Results:

Tight grid alignment is achievable through recurrent collateral interactions, contingent on head-direction modulation.
Competitive learning and spatial inputs lead to pre-aligned grid fields with random spatial phases.
Behavioral anisotropy, particularly speed anisotropy, distorts grid fields into ellipsoids, with the long axis aligning with the fast direction; speed anisotropy alone causes loose grid alignment.

Conclusions:

Grid alignment and ellipse orientation are influenced by network interactions and behavioral factors.
Spontaneous pattern formation can generate aligned, context-invariant spatial representations (grid fields) in the mEC.
Network interactions, specifically collateral interactions, are essential for coherent, context-invariant grid field expression across environments.