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Implicit Memory and REM Sleep:
A Pilot Study
C cile Colin, R.A., Jos Morais, Ph.D., and Myriam Kerkhofs, Ph.D.
This study examined implicit and explicit memory for words presented during Rapid Eye
Movement (REM) sleep. Ten subjects were presented two lists of twenty words: one list
just before they fell asleep and the other during the second and the third periods of REM
sleep. The next morning, they were given an implicit memory task (word stem
completion) and an explicit memory task (recognition). While they were carrying out
these tests, their electrodermal activity was recorded. The implicit task showed no
learning effect for either list of words, whereas the explicit task showed a learning effect
only for the list presented before sleeping. Moreover, the recording of the skin
conductance variations gave no significant results. Thus, no evidence of implicit memory
during REM sleep was observed. (Sleep and Hypnosis 1999;1:82-87)
| Keywords: REM sleep, implicit memory, learning, cognition |
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