Figure 4
Verbal memory consolidation. (A) Overnight memory improvement in the associated word-pair memory task (morning–evening) after a night with (STIM) and without auditory stimulation (SHAM). Dots represent the performance of single participants. (B) (Left) Detected spindles were classified based on their coupling to the positive (up-phase) or negative (down-phase) half-wave of 1 Hz waves. Depicted is the correlation between the number of consolidated word-pairs and the difference in the number of up- and down-phase coupled spindles, expressed relative to the total number of spindles detected during the entire night, separate for SHAM (top) and STIM (bottom). White dots represent electrodes with significant correlations (p < .05; cluster corrected, see methods); the black cross indicates the target electrode. (Right) Spearman’s rank correlation coefficient, averaged over significant electrodes (for STIM).
