Relationship between relative SWA and prosocial preferences for Sleep Cycle 1 (A), Sleep Cycle 2 (B), Sleep Cycle 3 (C), and Sleep Cycle 4 (D). The left panels show statistical topographical distributions of correlation coefficients between relative SWA and prosocial preferences. The blue areas indicate negative correlations; the red areas indicate positive correlations. The white dots indicate electrodes with significant correlations (p < 0.05) in the cluster of six electrodes identified in the main analysis (Fig. 3B). The right panels show scatterplots of the positive correlations between mean relative SWA in the significant cluster over the right TPJ and prosocial preferences (including regression line and confidence intervals 95%).