Contribution decisions, beliefs, and correlations with relative SWA. A, Contribution decisions and participants' beliefs about the average contribution of the other participants. Contribution decision (left) and the belief about others’ contribution (right) are depicted for each participant. Contribution decisions and corresponding beliefs per participants are joined by a line. B, Topographical distribution of r-coefficients between relative SWA and contribution decisions and (C) participants' beliefs. The blue areas indicate negative correlations; the red areas indicate positive correlations. The white dots indicate electrodes with uncorrected significant correlations (p < 0.05). The black dots indicate the position of the 59 electrodes.