Figure 1
From: Sex difference in the weighting of expected uncertainty under chronic stress
Illustration of the RL-based decision-making task. Each trial consisted of four stages, STIMULUS, DECISION, CONFIRMATION, and FEEDBACK. Two fractal stimuli each with a number in their center were shown to participants (STIMULUS phase). Participants were told that the fractal stimulus indicated reward probability which they had to learn through trial-and-error experience and that the number shown in the center represented the reward magnitude which they would receive once the stimulus was rewarded. Participants had three seconds to indicate their choice by pressing one of two arrow keys and were instructed to respond as soon as possible once they had made the decision (DECISION phase). The chosen stimulus was immediately highlighted by a gray frame (CONFIRMATION phase). Later, the rewarded stimulus was revealed in the center (FEEDBACK phase). ITI, inter-trial interval.
