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El Yazaji, M., Battas, O., Agoub, M., Moussaoui, D., Gutknecht, C., Dalery, J., d’ Amato, T. and Saoud, M. (2002) Validity of the depressive dimension extracted from principal component analysis of the PANSS in drug- free patients with schizophrenia. Schizophrenia Research, 56, 121-127. doi:10.1016/S0920-9964(01)00247-X

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• TITLE: Three-Factor structure of self-report schizotypal traits in a French nonclinical sample

  AUTHORS: Jérôme Brunelin, Patrick Dumas, Mohamed Saoud, Thierry d’Amato, Emmanuel Poulet

  KEYWORDS: Schizotypy; Psychosis Proneness Scales; Schizotypal Personality Questionnaire; Three-Factor Structure; Schizophrenia

  JOURNAL NAME: Open Journal of Psychiatry, Vol.1 No.3, October 12, 2011

  ABSTRACT: Evidence suggests that the structure of psychosis-proneness in the general population may involve three distinct related dimensions. Therefore we conducted a study, using a wider range of measures, to explore the factorial structure of schizotypy assessed by a mixed self-report Schizotypal Traits Questionnaire (mSTQ) in young French healthy individuals. Raine’s Schizotypal Personality Questionnaire [SPQ] and four of the Chapman’s scales [Magical Ideation Scale-MIS; Perceptual Aberration Scale-PAS; Revised Physical Anhedonia Scale-PhA and Revised Social Anhedonia Scale-SA] were combined to form a mSTQ which was administered to 232 French undergraduate students aged from 18 to 25 years old. A Principal Component Analysis [PCA] was carried out on scores for each scale to examine the factorial structure of schizotypal traits in this sample. PCA evidenced a three-factor model of schizotypy in the sample as a whole and even in the lower score sub-sample. The three factors were “positive or cognitive-perceptual”, “negative or social-interpersonal” and “disorganization” latent. Schizotypy, as assessed by these scales, is a multidimensional construct composed by at least three dimensions in this nonclinical sample. This factorial structure is similar to those of schizophrenia symptoms which raise the hypothesis of a continuum from normality to schizophrenia via schizotypal traits