Participants
Sixty-four undergraduate students took part in the study in exchange for course credits. All participants were recruited three-weeks before they began their final examination period and they were then randomly allocated to start the active OCAT or the control sham-training group in the same time period (i.e., within the same week). A simple randomization procedure, where all participants had the same probability of being allocated to the active OCAT or the control sham-training group, was carried out. This procedure was performed through a macro excel file which automatically assign the participants to one of the two experimental conditions. Nine participants of the active OCAT group and 5 of the control sham-training group were excluded from the analysis due to dropout and/or technical issues. Additionally, 2 participants were identified as outliers, defined as having scores ± 2.5 SD on the baseline assessment of the main outcome (i.e., attentional bias index), and were excluded (see Additional file General procedure