This paper describes a number of studies which were undertaken in order to test Eysenck's theory that the introversion‐extraversion factor is a significant source of variance in (1) authoritarian or ‘tough‐minded’ attitudes, (2) religiosity, and (3) anti‐social behaviour. There was no support for the hypothesized positive correlation between extraversion and tough‐minded or authoritarian attitudes. Introversion‐extraversion was a significant source of variance in subjects' religious behaviour but the direction of the relationship varied with religious background (Protestant and Jewish) and sex. Finally, the predicted positive correlation between extraversion and anti‐social behaviour was confirmed in a group of male students, but not in a comparable female group. This finding was interpreted in terms of a sex‐role identification theory of anti‐social behaviour.
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Aron Wolfe Siegman (1963) studied this question.