Learning by observation requires an early sleep window

Y.D. van der Werf, E. Van der Helm, M.M. Schoonheim, A. Ridderikhoff, E.J.W. van Someren

    Research output: Contribution to JournalArticleAcademicpeer-review


    Numerous studies have shown that sleep enhances memory for motor skills learned through practice. Motor skills can, however, also be learned through observation, a process possibly involving the mirror neuron system. We investigated whether motor skill enhancement through prior observation requires sleep to follow the observation, either immediately or after a delay, to consolidate the procedural memory. Sequence-specific fingertapping performance was tested in 64 healthy subjects in a balanced design. Electromyography verified absence of overt or subliminal hand muscle activations during observation. The results show that immediate sleep is necessary for the enhancement of a motor skill through prior observation. Immediate sleep improved the speed of subsequent performance by 22 ± 11% (mean ± SEM) (P = 0.04) and reduced the error rate by 42 ± 19% (P = 0.02). In contrast, no performance gains occurred if sleep was initiated more than 12 h after observation. A second study on 64 subjects ruled out explicit familiarity with the sequence or the spatiotemporal rhythm of the sequence to underlie performance improvements. The sleepdependent observational motor learning enhancement is at least similar to that previously reported for implicit and declarative memory. The apparent prerequisite of observing real movements indicates that subjects transfer experience obtained through observation of movements to subsequent self-initiated movements, in the absence of practice. Moreover, the consolidation of this transfer requires an early sleep window. These findings could improve learning new motor skills in athletes and children, but also in patients having to remaster skills following stroke or injury.
    Original languageEnglish
    Pages (from-to)18926-18930
    JournalProceedings of the National Academy of Sciences of the United States of America
    Issue number45
    Publication statusPublished - 2009

    Bibliographical note

    J English Article Van der Werf, YD, Royal Netherlands Acad Arts & Sci, Netherlands Inst Neurosci, Dept Sleep & Cognit, Meibergdreef 47, NL-1105 BA Amsterdam, Netherlands y.van.der.werf@nin.knaw.nl 25 0 NATL ACAD SCIENCES WASHINGTON 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA PROC NAT ACAD SCI USA NOV 10 Discipline: Multidisciplinary Sciences 517SJ


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