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Effects of (R)-ketamine [7.5, 15, 30 mg/kg i.p., (R)-KET], (S)-ketamine [7.5, 15 mg/kg i.p., (S)-KET], and vehicle (saline, SAL) on EEG theta power (5–9 Hz) for 23 h following administration during REM sleep. White boxes indicate that the given treatment caused REM sleep suppression; to such a degree that quantitative EEG analysis could not be performed.
