PMID-16474382[0] Reverse replay of behavioral sequences in hippocampal place cells during the awake state.
- wow: they show compressed reverse replay of firing sequences of hippocampal place cells during movement. While the rat is awake, too!
- recorded up to 128 cells from the rat hippocampus; 4 animals.
- the replay occurred while the rat was stopped, and lasted a few hundred milliseconds (~300).
- phenomena appears to be very common, at least for the rats on the novel tracks.
- replay events were coincident with ripples in the hippocampal EEG, which also occurs during sleep.
- however, during slow-wave sleep, the replay was forward.
- they offer a reasonable hypothesis for the reverse replay's function: it is used to propagate value information from the rewarded lcoation backwards along incoming (behavioral) trajectories.
- quote "awake replay represents efficient use of hard-won experience."
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