Cognitive functions refer to concepts by Carl Jung about what makes up our personality which is unique to different types of people. Faces (eytassessment.blogspot.com) "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 circumstance. [1] 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 "attitudes". He also categorizes the functions as either rational (thinking and feeling) or irrational (intuition and sensation). [2] ...