Figure 1.

Choice and bid tasks. The sequences of events within a trial for both choice and bid trials are shown. For choice trials, subjects saw “Choose” for 1 s. Subjects then saw two gambles, a $-bet gamble and a P-bet gamble. Subjects had unlimited time to choose one of the gambles. After submitting their response, subjects would see a check mark on the side of the chosen gamble. For bid trials, subjects saw “Bid” for 1 s. Subjects then saw one gamble, either a $-bet or a P-bet gamble, on the left side of the screen. To the right of the gamble was a “$” where subjects bids would appear. Subjects had unlimited time to submit their bids. After submitting their response, subjects would see the amount they bid.