Hans Eysenck suggested that a person's level of introversion or extraversion relates to the level of activation in that person's brain's reticular formation.

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Hans Eysenck proposed that an individual's level of introversion or extraversion is linked to the level of activation in their brain's reticular formation, which is responsible for regulating arousal and attention in the brain. This means that extraverts are expected to require more stimulation to achieve the same level of arousal as introverts, and are more likely to engage in activities that provide that stimulation.

Hans Eysenck Suggested That a Person's Level of Introversion or Extraversion