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Updated: Feb 5, 2026

Preparation of Parasagittal Slices for the Investigation of Dorsal-ventral Organization of the Rodent Medial Entorhinal Cortex
Published on: March 28, 2012
Stability of medial entorhinal cortex representations over time
Geoffrey W Diehl1, Olivia J Hon1, Stefan Leutgeb1,2
1Neurobiology Section and Center for Neural Circuits and Behavior, Division of Biological Sciences, University of California, La Jolla, California.
Medial entorhinal cortex (mEC) neurons show environment-dependent spatial map precision. Most mEC cells maintain stable firing patterns over time, but some layer III non-grid cells exhibit time-varying activity.
Area of Science:
- Neuroscience
- Systems Neuroscience
- Cognitive Neuroscience
Background:
- The medial entorhinal cortex (mEC) contains distinct cell types crucial for spatial memory and experience encoding.
- Previous research indicates mEC neurons represent different facets of experiences, but their dynamic properties remain incompletely understood.
Purpose of the Study:
- To investigate how environmental scale affects spatial representations in superficial mEC layers.
- To determine the temporal stability of spatial firing patterns in different mEC cell populations over extended periods.
Main Methods:
- Electrophysiological recordings from mEC neurons in rats foraging in environments of varying sizes (small vs. large).
- Analysis of spatial firing patterns and their stability across multiple recording sessions separated by minutes to hours (up to 6 hours).
Main Results:
- Spatial map precision for both grid and non-grid cells was higher in smaller environments.
- Within-session stability was greater for grid cells compared to non-grid cells.
- Most mEC cell populations, including grid cells, exhibited stable spatial firing patterns across sessions up to 6 hours apart.
- A subset (~15%) of layer III non-grid cells displayed significant time-dependent changes in firing patterns over 6 hours.
Conclusions:
- mEC grid cells and time-invariant non-grid cells likely contribute to stabilizing hippocampal spatial maps.
- Time-varying mEC non-grid cells may offer complementary temporal information, potentially supporting flexible navigation and memory.
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