What is it about?
Place cells in the hippocampus are important in both navigation and memory. Recording from thousands of neurons as mice ran around looking for cookie crumbles, we found that neighboring place cells are no more alike than distant ones, revealing that their activity is not clustered or locally organized in space.
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Why is it important?
In many parts of the brain, such as sensory or motor areas, neurons are organized in maps where nearby cells have similar functions. Some earlier studies suggested that a similar small-scale organization might exist in the hippocampus. However, our results show no evidence of such clustering, even at very fine spatial scales. Instead, place cells appear to be distributed more randomly. This kind of organization may actually be beneficial: the hippocampus can store a larger number of memories and locations more efficiently.
Perspectives
This work allowed us to revisit a decades-long debate about how the hippocampus organizes information for navigation and memory. By using modern high-resolution imaging, we were able to record from thousands of neurons simultaneously, providing both the scale and detail needed to address this question more definitively. An added benefit is that this approach generates large, high-quality datasets, which we hope will be useful for others studying how the brain represents space and memory.
Torstein Slettmoen
Kavli Institue for Systems Neuroscience, NTNU
Read the Original
This page is a summary of: Place cells in CA1 lack topographical organization of firing locations, Proceedings of the National Academy of Sciences, February 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2528601123.
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