Spontaneous recovery and sleep.

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Abstract
Investigated the hypothesis, suggested by B. R. Ekstrand (see record), that spontaneous recovery observed following sleep is related to REM or Stage-4 sleep. 5 groups of 20 undergraduates learned 2 paired-associate lists (A-B, A-C) and were tested for A-B recall either immediately, 20 min., or 7 hr. after A-C learning. The 7-hr groups slept in the laboratory during the retention interval while EEG, electrooculogram, and EMG recordings were made. 1 group was deprived of REM sleep, 1 was deprived of Stage-4 sleep, and the 3rd was a pseudodeprivation control. Results indicate no difference among any of the 5 conditions. The 2 control conditions produced results suggesting spontaneous recovery over 20 min. Findings suggest that the recovery found by Ekstrand probably had occurred before his Ss actually fell asleep. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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