instruction to the subject was as follows: “This task is a gambling type task in which you will be playing with 10 and 50 cents in each trial of the task. Two boxes with the numbers 10 and 50 will appear on the screen. Button #1 corresponds to the number 10 and button #4 corresponds to the number 50. When you see the numbers, select one of them quickly by pressing the appropriate button. Following your selection, the number you choose will reappear in a red box or a green box. If the number you selected is in a green box you gained that amount of money. If it is in a red box you lost that amount. The experiment is conducted in two blocks, and you will see a message telling you whether you’re winning or losing money after each block. Please try not to blink and sit as still as possible.” At the end of the experiment, all the participants received the monetary reward of the total amount they had accrued during the gambling trials.
