Speed awareness | Nature Reviews Neuroscience

For animals (and humans) to successfully navigate their environment, their brain must perform path integration to construct an 'internal map' of their surroundings. Over the past

half-century, several specialized populations of cells that encode the information essential to perform this task have been identified within the rodent hippocampus and entorhinal cortex. A

recent report from the Moser group now describes one of the remaining 'missing pieces' of the path integration system: a population of cells that are dedicated to signalling the speed of an

animal's movement.

To control the animals' running speed, they were placed in a bottomless 'Flintstones' car' that could be moved along the track at a constant speed

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