Figure 1

Experimental design. Each trial included a decision phase (6s), a response period and the feedback presentation (5s). In the decision phase, participants saw a burning house, the risk of house collapsing (10–70%), the number of victims (1 or 4), and the probability of the victims escaping without help (10–70%). In the response phase the participant decided between the options of rescue or no rescue. In the case of rescue, his/her own life was also in danger, but the probability to saving the victim(s) if the house did not collapse increased to a fixed value of 80%. The feedback was given showing as outcomes of what happened to the house, the victims and the firefighter character.