Figure 2.

High compulsives sample more information when no external costs apply. a High compulsive subjects gather more information before making a decision in the fixed condition, where sampling came at no external costs. b This increased information gathering led to higher winnings in the fixed condition, with no difference evident in the decreasing condition. c Subjects did not differ in their choice consistency, i.e., whether they picked the colour that was more plentiful at the time of choice. Computational modelling revealed that performance high compulsive subjects was more similar to an optimal agent (green diamonds) in the fixed condition, whereas in the decreasing condition, the low compulsive subjects were slightly more optimal in turns of draws and points won. **p < .01, *p < .05