Abstract
The hypothesized identity of the dimensions of extraversion-introversion and strength of the nervous system [NS] was tested on 4 groups of 9 [human] subjects [Ss] (neurotic extraverts, stable extraverts, neurotic introverts and stable introverts). Strength of the Ss NS was estimated using the EEG variant of extinction with reinforcement. Introverted Ss had weak NS, according to the EEG index, while extraverted Ss had strong NS, thus confirming the hypothesis. The dimension of strength of the NS was unrelated to differences in neuroticism. Eysenck''s theory relating differences in extraversion-introversion to differences in cortical arousal was supported.

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