Researcher:
Erhan, Ceyla

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PhD Student

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Ceyla

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Erhan

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Erhan, Ceyla

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20172

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    Obsessive compulsive features predict cautious decision strategies
    (Sage Publications Ltd, 2017) N/A; Department of Psychology; Erhan, Ceyla; Balcı, Fuat; PhD Student; Faculty Member; Department of Psychology; Graduate School of Social Sciences and Humanities; College of Social Sciences and Humanities; N/A; 51269
    Introduction: Obsessive compulsive disorder (OCD) is occasionally characterized by decision-making deficits. Compared to the isolated analysis of the choice and response times, characterizing decision outputs at the level of latent processes can be a more powerful approach in revealing differences, even in subclinical cases. We hypothesized that participants with higher obsessive compulsive (OC) features would set their decision thresholds higher and thus make more cautious decisions. Method: We used a perceptual two-alternative forced-choice (2AFC) task (dot motion discrimination) to test this hypothesis in a non-clinical sample (N = 74). We fitted the data with the diffusion model and evaluated the optimality of decision outputs. We also conducted exploratory analyses to reveal which subscales best predicted the differences at the level of latent decision processes. Results: Higher OC total scores in Maudsley and Padua scales significantly predicted higher threshold settings (cautiousness). The follow-up exploratory analyses with subscale scores showed that checking and rumination tendencies predicted higher threshold settings whereas washing tendency predicted faster non-decision times. Conclusions: Our primary results showed that participants with higher degrees of OC features exhibit more cautious decision making. Our exploratory analyses also revealed distinctions based on different types of OC features in both controlled (cautiousness in decision making) and automatic (faster non-decision times) elements of the decision process.
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    PublicationOpen Access
    Disrupted latent decision processes in medication-free pediatric OCD patients
    (Elsevier, 2017) Bulut, Gresa Carkaxhiu; Gökçe, Sebla; Özbaş, Duru; Dursun, Onur Burak; Yazgan, Yankı; Department of Psychology; Balcı, Fuat; Türkakın, Esin; Erhan, Ceyla; Faculty Member; Department of Psychology; Graduate School of Social Sciences and Humanities; 51269; N/A; N/A
    Background: Decision-making in Obsessive Compulsive Disorder has typically been investigated in the adult population. Computational approaches have recently started to get integrated into these studies. However, decision-making research in pediatric OCD populations is scarce. Methods: We investigated latent decision processes in 21 medication-free pediatric OCD patients and 23 healthy control participants. We hypothesized that OCD patients would be more cautious and less efficient in evidence accumulation than controls in a two alternative forced choice (2AFC) task. Results: Pediatric OCD patients were less efficient than controls in accumulating perceptual evidence and showed a tendency to be more cautious. In comparison to post-correct decisions, OCD patients increased decision thresholds after erroneous decisions, whereas healthy controls decreased decision thresholds. These changes were coupled with weaker evidence accumulation after errors in both groups. Limitations: The small sample size limited the power of the study. Conclusions: Our results demonstrate poorer decision-making performance in pediatric OCD patients at the level of latent processes, specifically in terms of evidence accumulation.