Jungian cognitive functions

Cognitive functions, also referred to as psychological functions, as described by Carl Jung in his book Psychological Types, are particular mental processes within a person's psyche that are present regardless of common circumstances. This is a concept that serves as one of the foundations for his theory on personality type. In his book, he noted four main psychological functions: thinking, feeling, sensation, and intuition. He introduced them with having either an internally focused (introverted) or externally focused (extraverted) tendency which he called "attitude". He also categorizes the functions as either rational (thinking and feeling) or irrational (intuition and sensation).