[Effects of (--)delta-9-trans-tetrahydrocannabinol (delta-9-THC) on tests of psychoticism. A study of Eysenck's drug postulate on the effects of hallucinogens in relation to psychoticism (author's transl)].

In a double-blind study on 36 volunteers the effects of 250 mug/kg (--)delta-9-trans-tetrahydrocannabinol p.o. on objective and performance tests measuring psychoticism according to Eysenck were assessed. The hypothesis was tested that subjects treated with delta-9-THC differ from those receiving placebo in the same way as endogenous psychotics differ from normals. Confirmation was obtained in only 5 out of 19 variables. Four of these 5 variables may be considered as tests of concentration.