Fig. 1.

Lottery choice task. On each trial, two gambles were presented with the same probabilities of winning a high or low outcome. However, gambles differed on the variance in low and high outcome. That is, on riskier gambles (right gamble) the difference between the high and low outcome was larger ($3.85 - $0.10) than on the safer gambles (left gamble, $2.00 - $1.60). Outcomes and probabilities were presented in corresponding colors (purple and orange). The decision phase was followed by a fixation screen after which the outcome on the chosen gamble was shown. Trials ended with a jittered inter-trial interval (ITI).