Laura de Putter

Obsessions and compulsions in the lab : a meta-analysis of procedures to induce symptoms of obsessive-compulsive disorder

Efficacious induction procedures of symptoms of obsessive-compulsive disorder (OCD) are necessary in order to test central tenets of theories on OCD. However, the efficacy of the current range of induction procedures remains unclear. Therefore, this meta-analysis set out to examine the efficacy of induction procedures in participants with and without OCD symptoms. Moreover, we explored whether the efficacy varied across different moderators (i.e., induction categories, symptom dimensions of OCD, modalities of presentation, and level of individual tailoring). In total we included 4900 participants across 90 studies. The analyses showed that there was no difference in studies using subclinical and clinical participants, confirming the utility of analogue samples. Induction procedures evoked more symptoms in (sub)clinical OCD than in healthy participants, which was most evident in the contamination symptom dimension of OCD. Analysis within (sub)clinical OCD showed a large effect size of induction procedures, especially for the threat and responsibility category and when stimuli were tailored to individuals. Analysis within healthy participants showed a medium effect size of induction procedures. The magnitude of the effect in healthy individuals was stronger for mental contamination, thought-action fusion and threat inductions.

Life is… great! : emotional attention during instructed and uninstructed ambiguity resolution in relation to depressive symptoms

Attention and interpretation biases are closely involved in depression. However, it is unclear whether they reflect processing tendencies (i.e., driven by schemas) and/or ability-related processes (i.e., dependent on attentional control). This study tested depressive symptom severity, attention bias, and interpretation bias associations under both processing conditions. Fifty-two participants completed two versions of the scrambled sentences test (to measure interpretation bias) while eye movements were recorded (to measure attention bias). Participants were instructed to unscramble sentences by reporting the first sentence coming to mind (tendency version) and in a fixed, positive manner (ability version). Depressive symptom severity was correlated with attention bias under both conditions. Attention bias acted as an intervening variable in the relation between depressive symptoms and interpretation bias during ability processes. These findings suggest that attention biases reflect both processing tendencies and ability dysfunctions, with attentional control as a relevant mechanism in the interpretation of emotional material.

Examining a Novel Gamified Approach to Attentional Retraining: Effects of Single and Multiple Session Training

Negative attention biases (AB) may play a causal role in the development of emotional disorders. In order to examine this proposed causal role, researchers have developed Attention Bias Modification (ABM) paradigms to experimentally induce or reduce AB. To date, most ABM studies have been based on modified dot-probe tasks. However, this task is only moderately successful in changing patterns of AB. In two laboratory-based experiments, we explored the effects of a novel visual search ABM paradigm, called “Intrinsically-Motivating Playable Attentional Control Training”, on AB processes and mood in undergraduate participants. Motivation was fostered by active task involvement (i.e., searching for target faces while ignoring irrelevant faces) and gamification techniques. In both experiments, training performance significantly improved, but failed to transfer to attention and mood measures. Possible explanations for the failure to find transfer effects are discussed.

Can selective attention and inhibition (interactively) predict future obsessive compulsive symptoms? A prospective study

BACKGROUND AND OBJECTIVES The current study set out to investigate whether obsessive beliefs, selective attention, inhibition, and the interaction between selective attention and inhibition can prospectively predict contamination obsessive compulsive (OC) symptoms. METHODS Obsessive beliefs, inhibition, and selective attention were assessed in a student sample (n = 89) during a baseline session in the beginning of the first semester. Their predictive value was examined by assessing symptoms after an OC symptom induction in the lab and by assessing OC symptoms during a period of increased stress (the examination period) 68-80 days after baseline. RESULTS Results showed that obsessive beliefs did not consistently predict OC symptoms and there was no predictive effect of attentional bias, attentional bias variability, and inhibition in isolation. However, attentional bias variability and inhibition in the context of contamination-related stimuli interacted, in which only the combination of poor inhibition and large attentional bias variability predicted contamination OC symptoms during the examination period. LIMITATIONS Future research should investigate whether similar results are found in clinical populations, as the current sample consisted of a convenience sample of undergraduate students. CONCLUSION These results support the notion that information processing biases interact in predicting contamination OC symptoms.