title: A nap to recap or how reward regulates hippocampal-prefrontal memory networks during daytime sleep in humans.
abstract: Sleep plays a crucial role in the consolidation of newly acquired memories. Yet, how our brain selects the noteworthy information that will be consolidated during sleep remains largely unknown. Here we show that post-learning sleep favors the selectivity of long-term consolidation: when tested three months after initial encoding, the most important (i.e., rewarded, strongly encoded) memories are better retained, and also remembered with higher subjective confidence. Our brain imaging data reveals that the functional interplay between dopaminergic reward regions, the prefrontal cortex and the hippocampus contributes to the integration of rewarded associative memories. We further show that sleep spindles strengthen memory representations based on reward values, suggesting a privileged replay of information yielding positive outcomes. These findings demonstrate that post-learning sleep determines the neural fate of motivationally-relevant memories and promotes a value-based stratification of long-term memory stores.
authors.affiliation: Department of Neuroscience, Faculty of Medicine, University of Geneva, Geneva, Switzerland.|Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland.|Geneva Neuroscience Center, University of Geneva, Geneva, Switzerland.
authors.forename: Kinga
authors.identifier: http://orcid.org/0000-0002-3428-8474
authors.initials: K
authors.lastname: Igloi
authors.affiliation: Department of Neuroscience, Faculty of Medicine, University of Geneva, Geneva, Switzerland.
authors.forename: Giulia
authors.initials: G
authors.lastname: Gaggioni
authors.affiliation: Department of Neuroscience, Faculty of Medicine, University of Geneva, Geneva, Switzerland.|Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland.|Geneva Neuroscience Center, University of Geneva, Geneva, Switzerland.
authors.forename: Virginie
authors.initials: V
authors.lastname: Sterpenich
authors.affiliation: Department of Neuroscience, Faculty of Medicine, University of Geneva, Geneva, Switzerland.|Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland.|Geneva Neuroscience Center, University of Geneva, Geneva, Switzerland.
authors.forename: Sophie
authors.initials: S
authors.lastname: Schwartz
mesh_terms: D000328:Adult; D005260:Female; D006624:Hippocampus / Q000502:physiology*; D006801:Humans; D007858:Learning; D008297:Male; D008568:Memory; D009415:Nerve Net / Q000502:physiology*; D017397:Prefrontal Cortex / Q000502:physiology*; D012201:Reward; D012890:Sleep; D055815:Young Adult
keywords: fMRI; hippocampus; human; memory consolidation; neural replay; neuroscience; reward; sleep spindles