Where is the geometry of the environment represented in the brain? The entorhinal cortex, where neurons fire repeatedly when an animal's position coincides with the vertices of a grid of triangles, looks like a good bet.
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Buzsáki, G. Neurons and navigation. Nature 436, 781–782 (2005). https://doi.org/10.1038/436781a
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DOI: https://doi.org/10.1038/436781a
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