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(a): Time sequence of stimuli in each trial of the decision task. Positions of 1 (distrust) and 3 (trust) for decision choices were counterbalanced between participants. Loss feedback was 0, and 20 was gain feedback. ISI = interstimulus interval; ITI = intertrial interval. (b): The photos of trustees differed regarding the emotional type (i.e., happy, angry, or neutral) and gender (i.e., female or male).
