According to Eysenck's "typological postulate," the nervous systems of are dominated by inhibition while the nervous systems of are dominated by excitation:

Extroverts, introverts

Explanation:

Eysenck explains personality as

a relatively enduring organization of a person's character, temperament, intellect, and physique, which is the determinant factor to his/her unique adjustment to the environment.

Aaccording to Eysenck's inhibition theory, individual differences exhibited in introverts and extraverts have their origins in the

cerebral cortex.

Eysenck argues that the brains of of introverts reacts more strongly and rapidly to stimuli than the brains of extraverts. He maintains that are more susceptible to reactive inhibition than introverts.

it would be heredity