http://video.ted.com/assets/player/swf/EmbedPlayer.swf

- rats’ brains, and presumably ours, tessellate the plane surface we walk on with multiple overlapping triangular grids
*(is there a mathematical reason triangles are optimal? euler characteristic, perhaps?)*
- “path” neurons in the hippocampus fire as we cross these grids to reconstruct our previous paths
- “boundary” neurons in the hippocampus fire as we approach the boundaries of a space
*(what about agoramaniacs? or ancient people who hunted buffalo on the plain?)*

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Tags: 2-D, brain, discrete, discrete differential geometryd, echolocation, geometry, location, memory, Neil Burgess, neuroscience, place, psychology, sense, senses, space, tessellation, triangle, triangles, triangulation of the plane

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