In this video, I’m going to discuss how you can find your cognitive function stack using the 4-letter code. The Myers-Briggs system has two key components: The dichotomies and the cognitive functions.

The dichotomies refer to the four psychological preferences within MBTI. Although we can all feel and think, sense and intuit, we are going to have a greater preference for one of the other. The four dichotomy of preferences include introversion (I) vs extroversion (E), intuition (N) vs sensing (S), thinking (T) vs feeling (F), and judging (J) vs perceiving (P).

In addition, there are eight cognitive functions: Introverted Intuition (Ni) vs Extroverted Intuition (Ne); Introverted Sensing (Si) vs Extroverted Sensing (Se); Introverted Thinking (Ti) vs Extroverted Thinking (Te); and Introverted Feeling (Fi) vs Extroverted Feeling (Fe).

However, what some people don’t realize is that the order of the four letters corresponds to the order of your cognitive functions. Thus, the four letters act as a formula. Just by looking at the four letters alone, you can determine the order of the four cognitive functions for any of the 16 types.

## How to Find Cognitive Functions for Each Type (MBTI)

Here are Some Basic Rules:

- First, introverts are always going to have an introverted dominant function, whereas extroverts are always going to have an extroverted dominant function.
- Second, the last letter (P or J) will tell you which of the middle letters is extroverted. Those two rules will help you determine the first two functions. If it is a J, it will “Join” to the next letter. If it is a P, it will pass the letter beside it. If you have a “P” at the end of your 4-letter code, your judging function (thinking or feeling) is going to be introverted, and your perceiving function (intuition or sensing) is going to be extroverted. If you have a “J” at the end of your 4-letter MBTI code, your perception (N or S) is going to be introverted, and your judging (T or F) is going to be extroverted.
- Next, your third function (tertiary) is easy to figure out—it will be the polar opposite of your secondary (auxiliary) function. Example: if the secondary function is Extroverted Intuition (Ne), then your third function will be the opposite: Introverted Sensing (Se). Sensing is the opposite of intuition in the dichotomies.
- Finally, your fourth function is also easy to determine—It’s the polar opposite of your dominant function.

The two middle letters indicate the two main functions (dominant and auxiliary) that each type uses. You just have to figure out which one is introverted and which one is extroverted, and you tell that by looking at the last letter and first letter.

Let’s put this together and determine the functions for a few types. First up, let’s do INTJ (since that’s my type).

The first letter is an “I,” so I know that it is going to be an introverted dominant function, whatever that function may be. Now, let’s look at the last letter to see which of the two middle letters is going to be the extroverted function. Remember the shortcut to remember how this works: ” J” will “join” to the letter next to it and extrovert that judging function (T or F), whereas a “P” will “pass” the letter next to it and extrovert the perceiving (N or S) function.

The last letter for INTJ is “J,” which will “join” to the letter before it (T). Therefore, “T” is the extroverted function for the INTJ, which is abbreviated as (Te). Since the dominant function is introverted for the INTJ, we know that the extroverted function will be the secondary function. Therefore, Extroverted Thinking is the secondary (auxiliary) function. We’ll go ahead and put that below.

In addition, since we know that the “T” is extroverted, that means that the remaining middle letter (“N”) is going to be the introverted function. We can add that one in as well, because it will be the dominant function. Always remember that the two middle letters will be the dominant and secondary functions.

- Introverted Intuition (Ni)
- Extroverted Thinking (Te)

After you have those two, you’re home free. All you have to do is put the polar opposite of the 2nd function as the 3rd function, which in this case, is going to be Introverted Feeling (Fi). Why? Feeling is the opposite of Thinking, and introversion is the opposite of extroversion. Finally, you put the polar opposite of the first function (dominant) as the fourth (inferior) function, which will be Extroverted Sensing (Se).

Thus, the final order for the INTJ’s cognitive function stack will be as follows:

- Introverted Intuition (Ni)
- Extroverted Thinking (Te)
- Introverted Feeling (Fi)
- Extroverted Sensing (Se)

As a quick note, the old MBTI system used to suggest that the auxiliary, tertiary, and inferior function were in the opposite attitude of the dominant function. For example, if a dominant function was introverted, all other functions would be extroverted. Thus, the old functional stack for INTJs used to be listed as this in the MBTI Manual:

- Introverted Intuition (Ni)
- Extroverted Thinking (Te)
- Extroverted Feeling (Fe)
- Extroverted Sensing (Se)

However, many personality theorists disagree with this, and they feel that Jung was really teaching that the tertiary function would be in the same attitude as the dominant function. That’s why most websites list the INTJ’s functional stack as Ni–Te–Fi–Se.

Let’s do another example to make your you’ve got this down.

For the ENTP, we first notice that the first letter is an E. Hence, it’s going to be a dominant extroverted function. To determine which function is extroverted, we look to the last letter, which will tell us the middle letter to be extroverted. The last letter for the ENTP is “P.” P’s pass the letter beside it (T), so that means that the “N” is the function that’s extroverted.

Therefore, Extroverted Intuition (Ne) is the ENTP’s dominant function. Next, we know that the other middle letter will be the secondary function. Since ENTPs have a dominant extroverted function, the secondary function is introverted. Thus, Introverted Thinking (Ti) is their second function.

Put the opposite of the second function for the third, which will be Extroverted Feeling (Fe). Finally, put the opposite of the dominant function as the last function, which will be Introverted Sensing (Si). Thus, the ENTP’s functional stack is as follows: Ne–Ti–Fe–Si.

This can seem confusing at first. Hopefully the video will be more clear. Once you’ve got this down, you can easily do it in your head. You’ll know how to think up the functional stack for any of the 16 personality types.