Drug addiction in its relation to extraversion, ambiversion and introversion

Abstract

162 morphine addicts were used in the study, with body-type differentiation according to Kretschmer used as the criteria of introversion, ambiversion and extraversion. The pyknic and athletic types include 29% each and only 4% fall in the asthenic type. A Wertheimer index was also used and showed that 40% of the group fell in the pyknic type and 50% in the athletic type. A discussion is given of Wilson's study on 216 morphine addicts with the Bernreuter and the Neymann-Kohlstedt tests, in which morphine users are found to be relatively stable emotionally. The author concludes that the average morphine addict within the scope of the study falls into the pyknoid type, disproving McDougall's hypothesis of close affinity between the use of alkaloid drugs and introversion. (PsycInfo Database Record (c) 2025 APA, all rights reserved)