onset. The OS would not appear if the subject did not respond/select within the specified time (1000 ms), and the next trial would commence. While the occurrence of loss (in red) or gain (in green) in the OS was maintained at equal probability (50%), the order of appearance was pseudo-randomized. Each subject had the identical presentation (i.e. there was no counter-balancing of trials). The subjects were not made aware of the probability of loss/gain or sequence of the task prior to the experiment. There were a total of 172 trials and the inter-trial interval was 3000 ms throughout the experiment. The task was presented in two blocks with each block (86 trials) lasting for 4 minutes; the procedure was identical in both blocks. At the end of each block, the status of overall ‘loss’ or ‘gain’ for the entire block was displayed on the monitor screen. The next block was started by the operator when the subject was ready. The 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
