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Usually when people say personalities share no functions together (such as INTPs and INTJs), they mean that each personality emphasizes different functions. As an example, an INTJ emphasizes Te whereas an INTP emphasizes Ti, an INTJ emphasizes Ni whereas an INTP emphasizes Ne, an INTJ emphasizes Fi whereas an INTP emphasizes Fe, and so on. When it comes down to it, we all use all 8 functions. Personality type tells us where we start and what we tend to be more conscious of. To illustrate:

INTJ

Function 1: Introverted Intuition (Ni)

Function 2: Extraverted Thinking (Te)

Function 3: Introverted Feeling (Fi)

Function 4: Extraverted Sensing (Se)

So far, nothing in common with INTPs first four functions...but there's more!

Function 5: Extraverted Intuition (Ne)

Function 6: Introverted Thinking (Ti)

Function 7: Extraverted Feeling (Fe)

Function 8: Introverted Sensing (Si)

INTP

Function 1: Introverted Thinking (Ti)

功能2:外向的直觉(Ne)

Function 3: Introverted Sensing (Si)

Function 4: Extraverted Feeling (Fe)

So far nothing in common with INTJs first four functions...but there's more!

Function 5: Extraverted Thinking (Te)

Function 6: Introverted Intuition (Ni)

Function 7: Extraverted Sensing (Se)

Function 8: Introverted Feeling (Fi)

它可以得到a bit murky when describing how each type utilizes functions 5-8 which is why most personality type models avoid them. Generally speaking, each type is more conscious of functions 1-4 although functions 3 and 4 are experienced as antagonistic while using 1 and 2 feels like a home base, or wheelhouse.