Abstract
A manual response, defined by switch closure, was rewarded with $.25 if it occurred within 15 sec. after the onset of a correct or if it failed to occur in the presence of an incorrect tone. Failure to respond to the correct tone occasioned the onset of a loud bell which awakened. S. Tones of equal loudness were randomly presented only during sleep. The criteria of sleep were: EEG [electroencephalogram] activity, vasomotor and EEG unresponsiveness to peripheral shock. Of the 5 Ss used 3 showed gradual acquisition of the discrimination during sleep and 2 discriminated within the 1st 10 trials.

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