Sleep on it, but only if it is difficult: Effects of sleep on problem solving
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Previous research has shown that performance on problem solving improves over a period of sleep, as compared with wakefulness. However, these studies have not determined whether sleep is beneficial for problem solving or whether sleep merely mitigates against interference due to an interruption to solution attempts. Sleep-dependent improvements have been described in terms of spreading activation, which raises the prediction that an effect of sleep should be greater for problems requiring a broader solution search. We presented participants with a set of remote-associate tasks that varied in difficulty as a function of the strength of the stimuli–answer associations. After a period of sleep, wake, or no delay, participants reattempted previously unsolved problems. The sleep group solved a greater number of difficult problems than did the other groups, but no difference was found for easy problems. We conclude that sleep facilitates problem solving, most likely via spreading activation, but this has its primary effect for harder problems.
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- Sleep on it, but only if it is difficult: Effects of sleep on problem solving
Memory & Cognition
Volume 41, Issue 2 , pp 159-166
- Cover Date
- Print ISSN
- Online ISSN
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- Problem solving
- Task complexity
- Author Affiliations
- 1. Centre for Research in Human Development and Learning, Department of Psychology, Lancaster University, Lancaster, LA1 4YF, UK
- 2. Department of Psychology, Fylde College, Lancaster University, Lancaster, LA1 4YF, UK