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A consistent map in the medial entorhinal cortex supports spatial memory.

Taylor J Malone^1,2, Nai-Wen Tien^1,3,2, Yan Ma^1,2

¹Spatial Navigation and Memory Unit, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.

Biorxiv : the Preprint Server for Biology

|November 21, 2023

Summary

This summary is machine-generated.

The medial entorhinal cortex (MEC) develops a stable cognitive map during learning, crucial for spatial memory. Disrupting this map impairs navigation, proving its necessity for effective memory-guided movement.

Keywords:

Cognitive map continuous attractor network models cue cells grid cells grid phase medial entorhinal cortex optogenetics recurrent connectivity spatial learning spatial memory synaptic plasticity

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Area of Science:

Neuroscience
Cognitive Science
Computational Neuroscience

Background:

The medial entorhinal cortex (MEC) is critical for spatial navigation and memory.
The developmental process of the MEC's cognitive map during learning is not well understood.

Approach:

Calcium imaging of MEC activity in mice learning a novel virtual environment over ten days.
Analysis of grid cell tuning consistency and phase relationships.
Measurement of c-Fos expression to assess synaptic plasticity.
Optogenetic disruption of MEC spatial map consistency.

Key Points:

MEC activity dynamics become more spatially consistent and stabilize during successful virtual environment learning.
Grid cells show enhanced spatial tuning and stable phase relationships, indicating synaptic plasticity and network mechanisms.
Successful learning is associated with specific MEC activity patterns, absent in unsuccessful learning.
Disrupting the MEC map's spatial consistency impairs memory-guided navigation.

Conclusions:

A spatially consistent MEC map develops progressively during learning.
This map is both correlated with and necessary for effective spatial memory and navigation.
Synaptic plasticity and network connectivity are key to shaping MEC grid cell activity during learning.