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. 2011 Mar 30;186(1):46-52.
doi: 10.1016/j.psychres.2010.07.035.

Cannabis users differ from non-users on measures of personality and schizotypy

Daniel J Fridberg  1 , Jennifer M Vollmer, Brian F O'Donnell, Patrick D Skosnik
Affiliations

Cannabis users differ from non-users on measures of personality and schizotypy

Daniel J Fridberg et al. Psychiatry Res. .

Abstract

Accumulating evidence indicates that cannabis use may be a risk factor for schizophrenia (SZ), and chronic cannabis users score higher than non-users on measures of schizotypal personality traits. The purpose of the present study was to investigate the relations between normal personality, schizotypy, and cannabis use. Sixty-two chronic cannabis users and 45 cannabis-naïve controls completed a measure of normal personality, the NEO-Five Factor Inventory (NEO-FFI), and two measures of schizotypy, the schizotypal personality questionnaire (SPQ) and perceptual aberration scale (PAS). Substance use was assessed using the SCID I alcohol/drug module and a locally developed drug use questionnaire. On the NEO-FFI, users scored higher than controls on openness, but lower on agreeableness and conscientiousness, and endorsed greater schizotypy on the SPQ and PAS. Higher neuroticism predicted greater schizotypy in both groups, and, higher Extraversion predicted lower negative-syndrome schizotypy among users. Finally, duration of cannabis use was positively correlated with scores on the SPQ and PAS among users, suggesting a relation between overall cannabis use chronicity and schizotypy. These data show that cannabis users differ from non-users on dimensions of normal personality and schizotypy, and provide further evidence that cannabis use is associated with increased levels of psychosis-related personality traits.

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Figures

Figure 1
Figure 1
Mean (±SEM) scores of the control and cannabis groups for each of the five NEO-FFI personality dimensions.
Figure 2
Figure 2
Total years of cannabis use (x-axis) versus total SPQ score (y-axis) for the cannabis group.
See this image and copyright information in PMC

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