Subklinik ve klinik popülasyonlarda karar verme: Sürüklenme yayılım model değişkenleri obsesif kompulsif ve benzer özelliklerle nasıl ilişkilenir?

This thesis investigates how latent decision making processes are affected in subclinical and clinical samples, with the overarching aim of testing and demonstrating the clinical relevance of decision theoretic approaches. Chapter I aims to characterize latent decision processes of a non-clinical population who rank on various levels on Obsessive Compulsive (OC) scales. We predicted that those who rank higher on OC traits would be more cautious in their decisions. Indeed, we found that higher checking and rumination tendencies as well as high scores in total OC scales predicted more cautious responding. Chapter II follows up on the first study and investigates latent decision processes in drug-free pediatric OCD patients and healthy controls. Results revealed that OCD patients accumulated evidence less efficiently but exhibited only a tendency to be more cautious than healthy controls. Furthermore, OCD patients became more cautious whereas healthy controls became less cautious after errors compared to after correct responses. Chapter III gamifies and validates a new 2AFC task to overcome the typical disadvantages of traditional approaches in the study of pediatric and clinical groups and investigates how latent decision processes change for high and low scorers on perfectionism, OC and anxiety traits in this task. We found that the Hierarchical Drift Diffusion Model (Wiecki, Sofer, & Frank, 2013) provided good fits to the data and the latent variables behaved in expected directions as a function of task parameters. Moreover, evidence accumulation rates were found to be lower for participants with high anxiety, perfectionism, and obsessive-compulsive trait scores.