Figure 10
Rated Pain Intensity.
Mean pain intensity ratings across participants on a 10-point visual analogue scale (VAS) for the Non-Social condition (all participants, N = 50, gray squares) the Social-Chance condition (all participants, N = 50, red circles) and the Social-Intentioned condition (split into dictators, indicated by yellow diamonds and receivers, indicated by blue triangles, N = 25 in each group). Data are modelled as a concave psychophysical function of number of shocks (dashed and dotted lines, see Supporting Results). Error bars represent one standard error above and below the mean. In the Social-Intentioned condition, when dictators behaved altruistically, allocating only 6 out a possible 24 shocks to the receiver, this significantly reduced pain perception relative to the other two conditions.
