Eysenck suggested that differences in the ratio of introversion to extraversion may be caused by

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Eysenck proposed that introverts have a higher level of arousal in their ascending reticular activating system (ARAS) than extraverts. This means that they have a lower threshold for sensory stimulation, causing them to become overwhelmed by external stimuli more easily than extraverts. Therefore, introverts seek out quiet and solitary environments to reduce their arousal levels. Extraverts, on the other hand, have a lower level of arousal in their ARAS and therefore require more stimulation to feel alert and engaged.

Eysenck Suggested That Differences in the Ratio of Introversion to Extraversion