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Tijdschrift voor Psychiatrie 32 (1990) 3

New research

The dimensional nature of psychosis

R.J. van den Bosch, F. Luteyn

Psychoticism is the dimensional alternative to the categorical concept of psychosis. In this study we examined this psychoticism dimension and its validity. Psychotic and nonpsychotic patients received various self-rating scales measuring psychoticism, extraversion and neuroticism, a structured interview, and were rated on a scale for psychotic(-like) experiences. Scores on the self-rating scales were factor analyzed. Psychoticism emerged as a clear factor. It correlated significantly with symptom scores and the various diagnostic groups were significantly different only on this factor. The other factors were extraversion, neuroticism and impulsivity-rigidity. These factors are less important in describing psychotic disorders, but nevertheless they tap clinically relevant aspects.