outcome events for loss/red and gain/green trials (OS) are equal (i.e., 50% loss and 50% gain trials regardless of the amount within each outcome), and the order of trial sequence is predetermined, pseudo-randomized, and identical for all participants. However, the participants are not aware of the probability or sequence of the trials. Although the loss and gain events are predetermined, the final outcome trials varied across the participants as they are free to choose either of the amounts in each trial.
