The activity structure of the brain's grid cells can be visualized as the surface of a doughnut. (IMAGE)
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“What we found was that the joint activity of the grid cell network resided on and moved along the surface of a torus, a doughnut. For the awake rat, the activity moved across the doughnut in synchrony with the animal’s movement in the room. At any given time, researchers could describe the rat’s network activity by coordinates on that doughnut.
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Helmet and the Kavli Institute for Systems Neuroscience
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