Reward sensitivity was measured at age 16 using a computerized card playing task (Goodnight et al., 2006), as adapted from J. P. Newman, Patterson, and Kosson (1987) and Siegel (1978). In the task, participants played cards to win money (gaining 25 cents for turning over face cards but losing 25 cents when turning over number cards). Participants could stop playing at any point, up to 100 cards, and keep their winnings. The probabilities were structured to set the optimal number of cards played at 50 to maximize winnings. After playing 100 cards, however, all winnings were lost. Reward sensitivity was measured as the number of cards played.
