There are 8 Jungian Cognitive Functions that make up Myers Briggs personalities. We have broken each down in depth: Introverted Functions Introverted Feeling (Fi) Introverted Thinking (Ti) Introverted Intuition (Ni) Introverted Sensing (Si) Extraverted Functions Extraverted Feeling (Fe) Extraverted Thinking (Te) Extraverted Intuition (Ne) Extraverted Sensing (Se)