University of California, Berkeley
A classic finding about hippocampal place cells is that they take part in reactivation events after experience, in which the structure of their ensemble co-activity patterns is recapitulated on a compressed timescale. This was interpreted as a mechanism for hippocampally dependent memory consolidation. In the twenty five years since, a large body of work has extended and in some cases challenged these findings, necessitating revision of the original hypothesis. Here I will review some of this work, and additionally present new, unpublished findings. Particularly, I will focus on awake hippocampal replay that occurs during spatial memory tasks, with new evidence for roles for replay in learning and decision-making in complex tasks.
 Foster, D.J. (2017) Replay comes of age. Annu Rev Neurosci. 40:581-602.
 Davoudi, H., Foster, D.J. (2019) Acute silencing of hippocampal CA3 reveals a necessary role in place field responses. Nature Neuroscience, 22(3):337-342.