A study links transient activation of the brain's reward system during a novel experience to frequent reactivation of memory traces during sleep and shows that artificial activation of the reward circuit can strengthen memories.
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Ewell, L., Leutgeb, S. Replay to remember: a boost from dopamine. Nat Neurosci 17, 1629–1631 (2014). https://doi.org/10.1038/nn.3875
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DOI: https://doi.org/10.1038/nn.3875