# Between res cogitans and res extensa: depression in neurosurgery, a pilot study - URL: https://alisanburak.com/en/wcp-2026-posterler/ev0355 - Language: en - Last updated: not specified - Page title: Between res cogitans and res extensa: depression in neurosurgery, a pilot study | WCP 2026 Summary > The design of a pilot study aimed at systematically assessing depressive symptoms in neurosurgical patients is presented, with the goal of testing the feasibil… This page was translated automatically from Turkish. [Read the original](https://alisanburak.com/wcp-2026-posterler/ev0355) This page is an AI-assisted Turkish summary of the study presented at the 26th World Congress of Psychiatry. The study belongs to the presenting authors; please refer to the original source when citing it. EV0355 E-PosterConsultation-Liaison PsychiatryPilot study (study design abstract) # Between res cogitans and res extensa: depression in neurosurgery, a pilot study BETWEEN RES COGITANS AND RES EXTENSA: DEPRESSION IN NEUROSURGERY Presenter: Manola P. Schlemper Country: Switzerland The design of a pilot study aimed at systematically assessing depressive symptoms in neurosurgical patients is presented, with the goal of testing the feasibility of the methodology before the main study. The pilot project aims to examine the relationship between patients' emotional state and somatic pathology, particularly in the context of neurosurgical conditions, and to better understand the influence of emotional factors on the clinical course and treatment process. According to the literature cited in the poster, the prevalence of depressive symptoms among neurosurgical patients is substantially higher than in the general population; a recent meta-analysis reported a preoperative prevalence of depression of approximately 15.3% and a postoperative prevalence of 11.5% among patients undergoing lumbar fusion. A prospective study of 232 patients found a higher preoperative prevalence of 34%, which declined to 13% at three months and remained at 15% one year after surgery, indicating partial postoperative improvement. In the proposed study, the mental state of neurosurgical patients will be assessed using the Beck Depression Inventory (BDI), a 21-item instrument with an average completion time of approximately 10 minutes. The purpose of the pilot phase is to test the feasibility and consistency of the study design, verify the applicability and comprehensibility of the psychological assessment instruments in the target population, and identify difficulties relating to administration, time requirements, and participant acceptability. It will also help organize participant recruitment, data collection, and data protection procedures; establish specific protocols for situations such as high scores on the Beck Depression Inventory; provide preliminary data for estimating sample size and selecting statistical analyses; and reduce methodological and ethical risks before the expanded study. The poster presents no results or numerical findings from the pilot study's own sample; the reported rates are drawn from the literature. [View the original poster](https://cslide.ctimeetingtech.com/wcp26/attendee/eposter/file/487) How to cite this study APA 7: Schlemper, M. P., Tanner, P., & Saceleanu, V. (2026, September 23-26). Between res cogitans and res extensa: depression in neurosurgery [E-poster]. 26th WPA World Congress of Psychiatry (WCP 2026), Stockholm, Sweden. https://cslide.ctimeetingtech.com/wcp26/attendee/eposter/file/487 Vancouver: Schlemper MP, Tanner P, Saceleanu V. Between res cogitans and res extensa: depression in neurosurgery [e-poster]. 26th WPA World Congress of Psychiatry (WCP 2026); 2026 Sep 23-26; Stockholm, Sweden. 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