[A reduced version of Thinking and Perceptual Style Questionnaire (TPSQ)]

The purpose of this paper was to create a short version of the Thinking and Perceptual Style Questionnaire (TPSQ), to be used for the detection of vulnerable individuals to psychosis. A confirmatory factor analysis was conducted to examine the dimensional structure of schizotypy. The sample consisted of 1785 participants, 719 males, with a mean age of 16.9 years (SD=3.05). The results indicate that either the original or the short version (TPSQ-R) show adequate psychometric properties. Internal consistency for the subscales of the original version ranged from 0.77 to 0.88, and from 0.73 to 0.83 of the short version. The confirmatory factor analyses conducted indicated that schizotypy is organized in four factors: Anhedonia, Aberrant Beliefs, Distorted Information Processing, and Social Paranoia. Correlations between the subscales of the original and short versions were high and statistically significant. Accordingly, the TPSQ-R seems to be an instrument with psychometric guarantee for the assessment of psychosis risk in nonclinical adolescents and young adults. The TPSQ-R could be used as a screening instrument in future research, combined with laboratory tasks and new computerized adapted versions.