In the modified gambling task, subjects selected cards from one of two decks to earn cash. The cards were pre-organized so that one deck (A) had an overall loss of $ every ten cards and the other deck (B) had an overall gain of $ every ten cards. All the cards in deck A gave a $ on every turn but were occasionally accompanied with losses, $ for example (for a net loss of $). The other deck B gave a smaller gain for each card, +$ but had smaller occasional losses. Subjects did not know the composition.
