Eysenck's biological theory is based on the assumption that there is an optimal level of biological arousal in the brain and that individuals who are quiet, reserved, and introverted are chronically overaroused.

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Eysenck's biological theory of personality suggests that introverts have higher levels of cortical arousal, leading them to seek lower levels of stimulation to maintain an optimal level of arousal, whereas extroverts, with lower baseline arousal, seek higher levels of stimulation.

Eysenck's Biological Theory Is Based on the Assumption That There