One of the earliest works of C.G.Jung is Psychological Types; a book which raised great interest among the psychological community, as it demonstrated in a sensible fashion the possibility to systematise and classify a number of attributes of personality according to a logical framework.
The interest in further exploration of the structure outlined in Jung's typology by the consciousness orienting functions and other psychic components has been considerably reduced.
In later works by C.G. Jung himself and followers that appraise the psychic structure and paths of psychological change and evolution, the main focus of attention is usually directed to other notions such as archetypes, collective and individual consciousness and unconsciousness, anima/animus, persona, complexes, etc.
Thinking, Feeling, Perception and Intuition are the four functions of the ego. Thinking is opposite to Feeling, and Perception is opposite to Intuition. Thinking and Feeling are rational functions, while Perception and Intuition are non-rational functions.
The concept of ego may be regarded as "I", the center of consciousness and of the individual will. The ego orients itself inside the field of reality by means of the four functions mentioned above and according to one basic psychic disposition, introverted or extroverted. The concept of self corresponds to a deeper and more enigmatic psychic component, and it is often associated to a directing nucleus or deeper urging that instigates the ego towards growth, change and evolution. (MORE...)
