Browsing by Author "Guliyev, EI"

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    Validation of the Turkish version of the self-evaluation of negative symptoms scale (SNS)
    Polat, I; Guliyev, EI; Elmas, S; Karakas, S; Aydemir, Ö; Üçok, A
    Objectives The Self-Evaluation of Negative Symptoms Scale (SNS) is a self-report scale that evaluates a patient's subjective experience on all five domains of the negative symptoms. This study aimed to present the adaptation and validation study of the Turkish version of SNS(SNS-TR). Methods Seventy-five patients and 50 controls were recruited for this study. After the approval of the translation, participants were asked to fill out SNS-TR by themselves. They were interviewed with the Brief Negative Symptoms Scale (BNSS), Positive and Negative Syndrome Scale (PANSS), and Calgary Depression Scale for Schizophrenia (CDSS). Results SNS-TR showed good internal consistency in the reliability analysis with Cronbach's alpha= 0.873. Subscale-total score correlation coefficients were significant (p < 0.01). In the validity analyses, the total and subscale scores of SNS-TR showed positive correlations with the total and subscales of BNSS, with only one exception of BNSS lack of distress subscales. The total score of SNS-TR demonstrated a significant correlation with PANSS-total, PANSS-negative subscale, PANSS-general subscale, and CDSS scores. Confirmatory factor analysis showed acceptable values for the five-factor structure, similar to the original version. Conclusion To conclude, our study indicates that SNS-TR is an easily applicable self-evaluation tool with good psychometric properties for assessing negative symptoms.
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    Reliability and validity study of the Turkish form of the Temporal Experience of Pleasure Scale (TEPS-TR)
    Guliyev, EI; Akdas, N; Keles, M; Soylu, I; Aydemir, O
    Objective: Anhedonia, characterized by a diminished capacity to experience pleasure, is a transdiagnostic concept observed across various neuropsychiatric conditions. It can be categorized into two domains based on the timing of pleasurable events: in-the-moment (consummatory) pleasure and anticipatory pleasure. The Temporal Experience of Pleasure Scale (TEPS) assesses these temporal aspects of pleasure. Having received a global response, it has been translated into many languages. This study aims to adapt and validate the TEPS for Turkish use (TEPS-TR). Method: Data were collected from 222 university students using convenience sampling, following ethical approval. The translated TEPS underwent reliability and validity analyses to assess its applicability and consistency. A set of measures assessing different aspects of anhedonia and apathy was co-administered to evaluate the scale's concurrent validity. Results: The Cronbach's alpha coefficient for the 15-item TEPS-TR was 0.823 for the full scale, 0.767 for the anticipatory subscale, and 0.746 for the consummatory subscale. Principal component analyses yielded three factors, explaining 48.87% of the variance. Confirmatory factor analysis, performed to evaluate the construct validity of the TEPS-TR, indicated an acceptable fit. The total and subscale scores of the TEPS-TR significantly correlated to varying degrees with all scales included in the analysis, except for Conclusion: The findings indicate that the TEPS-TR exhibits good reliability and validity in assessing anhedonia. However, further exploration into the distinct elements of anticipatory and consummatory pleasure within clinical populations is needed.