Rats 'dream' paths to a brighter future

When rats rest, their brains simulate journeys to a desired future such as a tasty treat. Researchers monitored brain activity in rats, first as the animals viewed food in a location they could not reach, then as they rested in a separate chamber, and finally as they were allowed to walk to the food. The activity of specialized brain cells involved in navigation suggested that during the rest the rats simulated walking to and from food that they had been unable to reach.

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