For Eysenck,the important difference between extraverts and introverts is that:

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Eysenck believed that extraverts have a lower level of cortical arousal than introverts, which causes them to seek out more stimulation and arousal to feel comfortable and alert. In contrast, introverts have a higher level of cortical arousal, causing them to prefer less stimulating environments to avoid overstimulation. Therefore, the main difference between extraverts and introverts is that extraverts desire more arousal, while introverts try to avoid it.

For Eysenck,the Important Difference Between Extraverts and Introverts Is That