Ragnar P. Ólafsson

Self reported attentional control with the Attentional Control Scale: factor structure and relationship with symptoms of anxiety and depression.

The Attentional Control Scale (ACS) is a self-report questionnaire that has been developed to measure individual differences in attentional control. Despite its fairly widespread use, little is known about the psychometric properties of the scale in adult samples. In the present study, factor structure of the ACS and its relationship with symptoms of anxiety and depression was investigated in a total sample of 728 Icelandic university students. Exploratory factor analysis in sample 1 (n=361), yielded two factors, labeled focusing and shifting. Confirmatory factor analysis in sample 2 (n=367) showed a reasonable fit of this two factor model. The two factors correlated strongly (0.73). The two subscales showed different predictive validity in a set of hierarchical regression analyses where the focusing subscale made a significant prediction of anxiety scores when depression scores were controlled for, and the shifting subscale significant prediction of depression scores when anxiety scores were controlled for. These findings are discussed in relation to previous studies on attentional and executive control in anxiety and depression.

Suppressing disgust related thoughts and performance on a subsequent behavioural avoidance task: Implications for OCD

We tested whether suppressing disgust related thoughts, compared with no suppression, differentially affected target thought frequency and emotional responses, and whether this was related to participants cognitive inhibition abilities. We also tested whether different control instructions during a thought control task would affect performance on a subsequent behavioural avoidance task involving disgust related stimuli. Sixty university students, pre-selected on their level of disgust propensity/sensitivity, were instructed to either suppress or not to suppress all target-related thoughts following viewing of a disgust-related film fragment. Thought suppression immediately reduced target thought frequency, but only for participants with good inhibitory control. Thought suppression led to sustained thought frequency and levels of disgust after suppression was lifted, whereas a significant drop was observed for these measures in the no-suppression group. Thought control instructions did not affect performance on the behavioural avoidance task at the group level. However, regression analyses showed that changes in thought frequency during thought suppression interacted with beliefs concerning importance of thoughts and thought control when predicting fear and disgust reactions during the behavioural task.

The Skin Picking Impact Scale: Factor structure, validity and development of a short version.

In the present study, we examined the psychometric properties of the Skin Picking Impact Scale (SPIS; Keuthen, Deckersbach, Wilhelm et al., 2001), a 10 item self-report questionnaire designed to assess the psychosocial impact of skin picking disorder (SPD). Participants were 650 individuals who met criteria for SPD in an online survey. Exploratory and confirmatory factor analyses demonstrated a unitary factor structure with high internal consistency (α = 0.94). Consequently, we constructed an abbreviated 4-item version that retained good internal consistency (α = 0.87) and a robust factor structure. Both the short and the full versions demonstrated discriminant and convergent/concurrent validity. In conclusion, the findings indicate that both versions are psychometrically sound measures of SPD related psychosocial impact; however, some potential limitations of the full scale are discussed.