Figure 1

Stimulus and results from the behavioral (Mouselab) experiment. (a) A numerical example (in JPY) of the two choice options (left) and “Mouselab” interface (middle) displayed to participants. Numerical outcome information, initially hidden behind boxes labeled L, M, or H (low, medium, or high), was displayed only when the participant held the pointer over a box. A choice was confirmed by clicking the check mark to the left of the option within the 30 seconds of the trial. Column order was counterbalanced every 6 trials (LMH or HML). Row order of the two options was randomized across participants and choice pairs in each task. (b) Maximin weights α, estimated from participants’ choices in the Self and Other conditions. The asterisks indicate that both were significantly different from zero (***P < 0.001). (c) Temporal changes in the average percentages of L, M, or H views during the decision time used by each participant in each trial, divided into quartiles. (d) Significant correlation between participants’ self-reported empathic-concern scores and the difference between the maximin weights (α) in the Other and Self conditions. (e) Significant correlation between participants’ self-reported empathic-concern scores and the difference between the percentages of the low (“L”) box view in the Other and Self conditions.