Psychiatry Research
Volume 134, Issue 1 , Pages 37-42, 30 March 2005

Symptoms of schizotypy precede cannabis use

  • Jason Schiffman

      Affiliations

    • Department of Psychology, University of Hawaii at Manoa, 2430 Campus Road, 110 Gartley Hall, Honolulu, HI 96822, USA
    • Corresponding Author InformationCorresponding author. Tel.: +1 808 956 6267; fax: +1 808 956 4700.
    • ,
  • Brad Nakamura

      Affiliations

    • Department of Psychology, University of Hawaii at Manoa, 2430 Campus Road, 110 Gartley Hall, Honolulu, HI 96822, USA
    • ,
  • Mitchell Earleywine

      Affiliations

    • Department of Psychology, University of Southern California, SGM 501, Los Angeles, CA 90089-1061, USA
    • ,
  • Joseph LaBrie

      Affiliations

    • Department of Psychology, Loyola Marymount University, One LMU Drive, Los Angeles, CA 90045, USA

Received 11 March 2004; received in revised form 25 October 2004; accepted 25 January 2005.

Abstract 

The current investigation uses a large non-clinical sample of undergraduate college students (N=189) to investigate schizotypal traits among cannabis and non-cannabis users, as well as the temporal order of the onset of these traits and cannabis use. Findings suggest that regular cannabis users are significantly more prone to cognitive and perceptual distortions as well as disorganization, but not interpersonal deficits, than non-regular users and those who have never used. Additionally, the onset of schizotypal symptoms generally precedes the onset of cannabis use. The findings do not support a causal link between cannabis use and schizotypal traits.

Keywords: Schizotypal traits, Marijuana, Causality

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PII: S0165-1781(05)00028-4

doi:10.1016/j.psychres.2005.01.004

Psychiatry Research
Volume 134, Issue 1 , Pages 37-42, 30 March 2005

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