Eysenck theorized that introverts had greater cortical arousal than extraverts, particularly in the

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Eysenck believed that introverts have a higher level of cortical arousal than extraverts, particularly in the reticular activating system (RAS), a network of neurons responsible for regulating arousal and attention. The RAS is located in the brainstem and is responsible for regulating sleep-wake cycles, alertness, and attention. Introverts are thought to have a more active RAS than extraverts, which may contribute to their tendency to be more introspective and reflective.

Eysenck Theorized That Introverts Had Greater Cortical Arousal Than Extraverts