Carl Jung identified eight cognitive functions, grouped into four pairs. Each pair covers a different way your mind processes information or makes decisions:
Extraverted Intuition (Ne) — Sees patterns and possibilities in the external world. "What if...?"
Introverted Intuition (Ni) — Sees patterns and meanings internally. "What does this mean?"
Extraverted Sensing (Se) — Engages with the present moment through the five senses. "What's happening right now?"
Introverted Sensing (Si) — Compares present experience to past memory. "Have I felt this before?"
Extraverted Thinking (Te) — Organizes the external world logically. "What works?"
Introverted Thinking (Ti) — Analyzes internal logical consistency. "Does this make sense?"
Extraverted Feeling (Fe) — Harmonizes with others' emotions. "How does everyone feel?"
Introverted Feeling (Fi) — Aligns with personal values. "Is this authentic to me?"
Each MBTI type has a unique stack of four functions, ordered by strength. The first is your dominant function — the one you use most naturally. The fourth is your inferior function — the one you struggle with most.
Example: INFP
Dom: Fi (Introverted Feeling) → Aux: Ne (Extraverted Intuition) → Tert: Si (Introverted Sensing) → Inf: Te (Extraverted Thinking)
Example: ENFP
Dom: Ne (Extraverted Intuition) → Aux: Fi (Introverted Feeling) → Tert: Te (Extraverted Thinking) → Inf: Si (Introverted Sensing)
Notice: INFP and ENFP share the same four functions, just in a different order. This is why they can understand each other deeply, but also frustrate each other — they prioritize differently.
Knowing your cognitive functions helps you understand not just "what type you are" but "how your mind actually works." It explains why you might be great at brainstorming (Ne) but bad at following through (low Te). It explains why you feel drained after social events (if your dominant function is introverted).
It also helps you grow. The goal isn't to change your type — it's to develop your weaker functions so you become more well-rounded.
Cognitive function theory is a useful framework, but it's not science. MBTI itself lacks strong empirical support, and function theory is an interpretation built on top of it. Use it as a tool for reflection, not as a rigid label. You are not your type.