Extraversion and Adaptation to Intermittent Light

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Abstract
47 non-neurotic extraverts and 47 non-neurotic introverts as determined by the Maudsley Personality Inventory were tested for local adaptation to intermittent light. The amount of adaptation was significantly greater for the introverts. This follows from McDougall's theory of cortical inhibition but is contrary to Eysenck's. However, the results would fit a combination of the two theories that takes into account moderation of the extraversion-adaptation relationship by neuroticism. According to such a theory, among neurotics cortical inhibition is greater for extraverts, and among non-neurotics it is greater for introverts. An alternative interpretation is also suggested which assumes an inverted-U relationship between adaptation and arousal.

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