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Abstract
The aim of the study was to investigate the validity of the Rorschach Perceptual Thinking Index (PTI) to detect psychotic perceptual and thought disturbance in a sample of Slovene psychiatric inpatients. Using a sample of 275 adult psychiatric inpatients of both sexes, we examined the differences between patients with psychosis (PP) and patients with no psychotic features (NP) from various diagnostic groups on the global PTI and its subcomponent variables. PPs obtained significantly higher PTI scores, indicating more disturbed perception and more thinking disturbance, than NPs. No differences were found for diagnostic differences within the PP and NP groups. Results are in accordance with previous studies of the PTI as a valid cross-cultural index of perceptual and thinking disturbance.