Article abstract


Nature Neuroscience 10, 1206 - 1213 (2007)
Published online: 12 August 2007 | doi:10.1038/nn1959

Daytime sleep condenses the time course of motor memory consolidation

Maria Korman1, Julien Doyon2, Julia Doljansky3, Julie Carrier2, Yaron Dagan3 & Avi Karni1


Two behavioral phenomena characterize human motor memory consolidation: diminishing susceptibility to interference by a subsequent experience and the emergence of delayed, offline gains in performance. A recent model proposes that the sleep-independent reduction in interference is followed by the sleep-dependent expression of offline gains. Here, using the finger-opposition sequence–learning task, we show that an interference experienced at 2 h, but not 8 h, following the initial training prevented the expression of delayed gains at 24 h post-training. However, a 90-min nap, immediately post-training, markedly reduced the susceptibility to interference, with robust delayed gains expressed overnight, despite interference at 2 h post-training. With no interference, a nap resulted in much earlier expression of delayed gains, within 8 h post-training. These results suggest that the evolution of robustness to interference and the evolution of delayed gains can coincide immediately post-training and that both effects reflect sleep-sensitive processes.

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  1. Brain-Behavior Research Center, University of Haifa, Mount Carmel, Haifa 31905, Israel.
  2. Department of Psychology, University of Montreal, P.O. Box 6128, Montreal, Quebec H3C 3J7, Canada.
  3. Chronobiology & Sleep Laboratory, Sheba Medical Center, Sheba St., Tel Aviv 52662, Israel.

Correspondence to: Maria Korman1 e-mail: mariakorman@yahoo.com

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