Fig. S2.

Social contagion of risk-preference in an independent behavioral experiment. (A) Change of an example participant’s risk-preference toward the observees’. The format is the same for Fig. 2A. Twelve healthy participants (six female participants; age range, 18–43 y; mean $\pm$ SD, 27.42 $\pm$ 7.48) took part in the behavioral experiment. The experimental procedure was the same as the main experiment, but the participants were not scanned. (B) Degree of social contagion (mean $\pm$ SEM across participants; n = 12). The format is the same for Fig. 2B. **P < 0.01. (C) Degree of social contagion plotted separately for the risk-averse and -seeking observees (mean $\pm$ SEM across participants). The format is the same for Fig. 2C. *P < 0.05.