Current earnings were displayed numerically on the screen, centered just below the middle two balloons. There were four blocks, each containing approximately 30 trials (1-3 extra win trials were added to two blocks to provide variable winnings from block to block). A coin jar was presented after each block, into which coins (dimes) appeared, one by one, each followed by a coin sound. The coin jar was introduced using three practice trials at the outset of the game. A total of 120 trials (60 per condition) were administered for the purpose of computing ERPs. Three additional trials were added such that the total winnings were $6.30 for each participant. Participants received this payment as part of a larger compensation ($60), for a study on stress and decision-making.
