Sleep stage II contributes to the consolidation of declarative memories

Ruch, Simon; Markes, Oliver; Duss, Simone B.; Oppliger, Daniel; Reber, Thomas P.; Koenig, Thomas; Mathis, Johannes; Roth, Corinne; Henke, Katharina (2012). Sleep stage II contributes to the consolidation of declarative memories. Neuropsychologia, 50(10), pp. 2389-2396. Oxford: Elsevier 10.1016/j.neuropsychologia.2012.06.008

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Various studies suggest that non-rapid eye movement (NREM) sleep, especially slow-wave sleep (SWS), is vital to the consolidation of declarative memories. However, sleep stage 2 (S2), which is the other NREM sleep stage besides SWS, has gained only little attention. The current study investigated whether S2 during an afternoon nap contributes to the consolidation of declarative memories. Participants learned associations between faces and cities prior to a brief nap. A cued recall test was administered before and following the nap. Spindle, delta and slow oscillation activity was recorded during S2 in the nap following learning and in a control nap. Increases in spindle activity, delta activity, and slow oscillation activity in S2 in the nap following learning compared to the control nap were associated with enhanced retention of face-city associations. Furthermore, spindles tended to occur more frequently during up-states than down-states within slow oscillations during S2 following learning versus S2 of the control nap. These findings suggest that spindles, delta waves, and slow oscillations might promote memory consolidation not only during SWS, as shown earlier, but also during S2.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology
04 Faculty of Medicine > University Psychiatric Services > University Hospital of Psychiatry and Psychotherapy > Psychiatric Neurophysiology [discontinued]
07 Faculty of Human Sciences > Institute of Psychology > Psychological and Behavioral Health
10 Strategic Research Centers > Center for Cognition, Learning and Memory (CCLM)

UniBE Contributor:

Ruch, Simon, Markes, Oliver, Duss, Simone, Reber, Thomas, König, Thomas, Mathis, Johannes, Roth Wälti, Corinne, Henke, Katharina


100 Philosophy > 150 Psychology
600 Technology > 610 Medicine & health








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Date Deposited:

04 Oct 2013 14:26

Last Modified:

05 Dec 2022 14:08

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URI: (FactScience: 215207)

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