Eysenck argued that extraverts and introverts differ only in their behavior and not in their physiological makeup.

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Eysenck believed that extraverts and introverts have different levels of arousal in their nervous system, with extraverts needing more stimulation to reach an optimal level of arousal and introverts being easily overstimulated. He also believed that this difference had a biological basis.

Eysenck Argued That Extraverts and Introverts Differ Only in Their