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Girardeau et al. show that coordinated reactivations of functionally connected neurons between the hippocampus and the basolateral amygdala occur during sharp wave–ripples of sleep following training on an aversive spatial task. These findings suggest a mechanism by which emotional memories are consolidated during sleep.
Many spatial correlates have been identified that form the neural basis for navigation. Two studies have now uncovered a new cell type: bidirectional cells, which fire when the head is pointing in one of two opposing directions.