History
The model in which these four cognitive functions combine in different ways to form different people's personalities was initially conceived by Carl Jung in his pioneering work Psychological Types (1921, ISBN 0-691-09770-4). Jung also posited that the functions formed a hierarchy within a person's personality—the most important function is referred to as the "dominant", with the remaining three filling the roles as "auxiliary," "tertiary," and "inferior" functions. In addition, each mental function is seen as either introverted or extroverted (known as attitudes). This idea is interpreted in terms of whether the person finds it more rewarding when using the function in question to have an outward focus on people and things (extraversion) or an inward focus on thoughts and ideas (introversion). These models do not claim that people are only capable of applying the function in question in that attitude, but rather that operating in the opposite attitude requires the expenditure of "energy" (or rather, emotional resources, enthusiasm, and so on) whilst operating in the person's natural attitude replenishes that same energy.
Read more about this topic: Jungian Cognitive Functions
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