–Effect of stimulation on memory consolidation. A, Overall effect of stimulation on PAL performance change after nap was not found to be statistically significant. Paired t(6) < 0.77, P > 0.23, one-tailed. Error bars indicate standard error of the mean. Scatterplots correlating change in baseline spectral power due to stimulation with change in PAL performance due to stimulation for B, Slow; C, Delta; and D, Alpha frequency bands.