Effects of phase-locked acoustic stimulation during a nap on EEG spectra and declarative memory consolidation

• Participants were studied during an afternoon nap under two conditions: STIM and SHAM.• In the STIM condition, acoustic stimulation was applied in Stage 2 and 3 sleep.• Stimulation was phase-locked to the up-phase of slow wave activity.• Acoustic stimulation increased slow wave, theta and fast spindle activity.• Concurrently, memory improvement in the form of reduced forgetting was demonstrated.

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