extroversion

n. Extroversion/introversion (or extroversion), one of the dimensions of the five factor model, contrasts active, sociable, and cheerful extroverts with reserved, solitary, and somber introverts. Extroversion is the most easily inferred of the five factors, often apparent from seeing a photograph or hearing a spoken sentence or two. Extroverts are cheerful and friendly, but introverts are not depressed and hostile; introverts simply lack positive feelings and prefer to be alone. Extroverts prefer enterprising vocations and have higher lifetime earnings than introverts. There is a growing body of evidence that Europeans and their descendants are, on average, higher in extroversion than Asians and Africans.

一 RRM