Questionnaires
Four questionnaires were used to measure participants’ underlying psychopathological traits. Depression levels were assessed with the second edition of Beck’s Depression Inventory (BDI-II; Beck et al., 1961). BDI-II contains 21 items, each corresponds to a symptom of depression and measured in a four-point-scale (0-3). Anxiety levels were measured with State-Trait Anxiety Inventory (STAI; Spielberger, 1970) which contains 20 items measuring state anxiety (STAI-S) and 20 items measuring trait anxiety (STAI-T). The items are measured in a four-point scale (1 = Not at all/ Almost never , 4 = Very much so/Almost always ). Intolerance of uncertainty was measured with the Intolerance of Uncertainty Scale (IUS; Buhr & Dugas, 2002) which is a 27-item scale that measures the dispositional tendency to find uncertain situations aversive and anxiety provoking (Morriss et al., 2016). IUS’ items are measured in a 5-point scale ranging from 1 = not at all characteristic of me – 5 = entirely characteristic of me . Social anxiety levels were measured with Liebowitz Social Anxiety Scale (LSAS; Liebowitz, 1987) which includes 24 items, each assessing both fear or anxiety and avoidance behaviors. The items are measured in a 4-point scale ranging from 0 = non/never to 4 = severe/usually .