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Sleep facilitates memory consolidation. A widely held model assumes that this is because newly encoded memories undergo covert reactivation during sleep. We cued new memories in humans during sleep by presenting an odor that had been presented as context during prior learning, and so showed that reactivation indeed causes memory consolidation during sleep. Re-exposure to the odor during slow-wave sleep (SWS) improved the retention of hippocampus-dependent declarative memories but not of hippocampus-independent procedural memories. Odor re-exposure was ineffective during rapid eye movement sleep or wakefulness or when the odor had been omitted during prior learning. Concurring with these findings, functional magnetic resonance imaging revealed significant hippocampal activation in response to odor re-exposure during SWS.
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Rasch et al. (Thu,) studied this question.
synapsesocial.com/papers/6a1a36d5c57ffb28463c1505 — DOI: https://doi.org/10.1126/science.1138581
Björn Rasch
University of Fribourg
Christian Büchel
University of Vermont
Steffen Gais
University of Tübingen
Science
Universität Hamburg
University Medical Center Hamburg-Eppendorf
University of Lübeck
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