Final answer:
Carl Jung divided behavior into the attitudes of extroversion and introversion, which are core to his analytical psychology and have greatly influenced modern personality psychology.
Step-by-step explanation:
Carl Jung divided behavior into a pair of attitudes known as extroversion and introversion. Jung's concept posits that extroverts are energized by social interaction and outward activities, deriving their energy from being around others. In contrast, introverts may be quiet and reserved or sociable, yet they derive their energy from their inner psychic activity. Jung highlighted that a balance between these two attitudes is conducive to achieving self-realization, a core aspect of his theory of analytical psychology. Moreover, Jung's notion of extroversion and introversion has tremendously influenced personality psychology, as these ideas are incorporated into most personality models today, including the Myers-Briggs Type Indicator (MBTI).