Eysenck proposed that the extraversion/introversion dimension of personality is related to activation in the brain. Relative to their optimal level of arousal, extraverts tend to be chronically , which is related to activity in the .

a. over-aroused; reticular activating system.

b. under-aroused; reticular activating system.

c. over-aroused; frontal lobes.

d. under-aroused; frontal lobes.

b. under-aroused; reticular activating system

Explanation:

Hans Jurgen Eysenck was a German-British psychologist and was famous for his works on intelligence and personality. He proposed that the extraversion/introversion dimension of personality is related to activation in the brain.

He explained that relative to their optimal level of arousal, extraverts tend to be chronically under-aroused, which is related to activity in the reticular activating system.

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