REM sleep enhancement of probabilistic classification learning is sensitive to subsequent interference
Murray M Barsky1, Matthew A Tucker2, Robert Stickgold1
1Center for Sleep and Cognition, Dept. of Psychiatry, Harvard Medical School, Beth Israel Deaconess Medical Center, 330 Brookline Ave/FD 861, Boston, MA 02215, USA.
Neurobiology of Learning and Memory
|March 15, 2015
Summary
A daytime nap enhances implicit learning and memory consolidation, particularly after REM sleep. However, this sleep-dependent benefit is vulnerable to interference, suggesting sleep strengthens memories that are easily disrupted.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Sleep Science
Background:
- The brain forms implicit relationships between stimuli during wakefulness.
- Sleep processes strengthen these relationships, improving subsequent waking performance.
- Prior research links improved implicit learning to REM sleep duration.
Purpose of the Study:
- To examine the impact of a REM sleep-containing nap on Weather Prediction Task (WPT) performance.
- To assess the effect of post-nap interference on memory consolidation.
- To compare nap effects with an equivalent period of wakefulness.
Main Methods:
- Participants underwent a daytime nap or quiet rest.
- Weather Prediction Task (WPT) performance was measured before and after the nap/rest.
- An interference task was introduced post-nap/rest to probe memory strength.
Main Results:
- Napping significantly improved WPT performance, correlating with REM sleep duration.
- The REM sleep-associated performance boost was eliminated by interference training.
- Performance after wakefulness remained unchanged and was unaffected by interference.
Conclusions:
- Daytime naps, especially those with REM sleep, enhance implicit probabilistic learning.
- Sleep-dependent memory consolidation is susceptible to retroactive interference.
- Sleep strengthens memories, but these strengthened memories can be fragile in the short term.
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