Journal
ELIFE
Volume 9, Issue -, Pages -Publisher
eLIFE SCIENCES PUBL LTD
DOI: 10.7554/eLife.63550
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Categories
Funding
- NIH [F32AG067640, R01MH052090, R01MH095297, DP2MH122399, MH120073]
- Office of Naval Research [ONR MURI N00014-19-12571, MURI N00014-16-1-2832]
- One Mind Institute
- McKnight Foundation
- Mount Sinai Health System
- Brain Research Foundation
- Brain and Behavior Research Foundation
- Esther A. and Joseph Klingenstein Fund
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While memories are often thought of as flashbacks to a previous experience, they do not simply conserve veridical representations of the past but must continually integrate new information to ensure survival in dynamic environments. Therefore, 'drift' in neural firing patterns, typically construed as disruptive 'instability' or an undesirable consequence of noise, may actually be useful for updating memories. In our view, continual modifications in memory representations reconcile classical theories of stable memory traces with neural drift. Here we review how memory representations are updated through dynamic recruitment of neuronal ensembles on the basis of excitability and functional connectivity at the time of learning. Overall, we emphasize the importance of considering memories not as static entities, but instead as flexible network states that reactivate and evolve across time and experience.
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