However, researchers have found that, by 2nd or 3rd grade, extroversion is only half as important.
This terminology, Introversion and extroversion, is bound up with my way of regarding mental phenomena as forms of energy.
The introversion type only knows the thought principle, and the extroversion type only that of feeling.
extroversion ex·tro·ver·sion or ex·tra·ver·sion (ěk'strə-vûr'zhən)
A turning inside out, as of an organ or a part.
Interest in one's environment or in others as opposed to or to the exclusion of oneself.