# Thread: Possible rule for determining one's MBTI Tertiary doppelganger

1. ## Possible rule for determining one's MBTI Tertiary doppelganger

I'll start with my own type, and derive the pattern from there:

Dominant - Tertiary
INTP - ISTJ
INFP - ISFJ
INTJ - INFP
INFJ - INTP
ISTP - INTJ
ISFP - INFJ
ISTJ - ISFP
ISFJ - ISTP

ENTP - ENFJ
ENFP - ENTJ
ENTJ - ESTP
ENFJ - ESFP
ESTP - ESFJ
ESFP - ESTJ
ESTJ - ENTP
ESFJ - ENFP

When deriving the tertiary MBTI from a dominant -

1. the attitude (I/E) remains the same, but is reinforced by the tertiary (tertiary users will probably score as high as 100% on the I/E scales).

2. The Dominant letter remains the same (the T in Ti, the S in Si).

3. The Auxiliary letter changes to its opposite (S to N, T to F).

4. And J/P changes to its own opposite.

2. Cool, seems like it works. I always figured there was some kind of pattern, but I could tell it wasn't a simple or obvious one. Thanks for figuring this out and sharing!

3. I've seen this in someone!!!

Really using the tertiary, scoring as EXTREMELY INTROVERTED, and appearing as their doppelganger, at least in more distant contact.

4. I've seen this too. That's god damn awesome that I'm not the only one; that means it probably has more truth to it then.

5. wait... what??

6. huh. I like that... only, without consuming the time it may take for me to change all the types, i'll try to explain my thought. I would think the doppleanger would be one with similar functions all around.... like, instead of INTP (Ti/Ne/Si/Fe) with ISTJ (si/te/fi/ne) it would more be like INTP with ISFJ- jumbled functions (Si/Fe/Ti/Ne.) Know what I mean? I've always thought of strange similarities in the people with jumbled functions- one's tertiary is another one's primary and visa versa (and other top functions are the same.) . Ugh, this is coming out so strange, I hope it makes sense.

Just one more example to make me more comfortable with this post. INFP (Fi/Ne/Si/Te) with ISTJ (Si/Te/Fi/Ne)

7. Well they're called dom-tert loops. It's not like mal invented this, this is fucking Lenore Thomson, repackaged.

8. Originally Posted by Marmie Dearest
Well they're called dom-tert loops. It's not like mal invented this, this is fucking Lenore Thomson, repackaged.
Hmm... maybe not... wasn't listening, and re read again. Was what I said more Lenore Thompson? I'm not read on her, so I wouldn't know anyway- his thing could be trying to attempt something different.

9. No he's talking about Lenore Thomson dom-tert loops. As you can see, at the top it says "Dominant-Tertiary."

Like an ISTJ in an Si-Fi loop can seem ISFP (or INFP, which is more similar to what you've said about matchy matchy functions)...but typically yeah more like an ISFP since they're presenting a Sensing function even though it's not Se. They can look like an extremely introverted ISFP.

Or an ISFP in an Fi-Ni loop can actually look similar to an INFP (though mal has INFJ listed, I would say it depends on how strong the Ni is vs. Fi).

Yes, this is absolutely pre-packaged Lenore Thomson dom-tert theory, and I do agree with her theory, and I've witnessed it in people.

It's only pre-packaged because he's making it more about letters than functions. I just wanted to make sure to point out that this is based in a more widely accepted theory since I neglected to do so before.

I sometimes forget how haphazard the knowledge is on this forum about function theory. It's one of the main things I like about Personality Nation, though I'm much more comfortable with the warm social environment here and the level of activity.

10. Originally Posted by mal12345
I'll start with my own type, and derive the pattern from there:

Dominant - Tertiary
INTP - ISTJ
INFP - ISFJ
INTJ - INFP
INFJ - INTP
ISTP - INTJ
ISFP - INFJ
ISTJ - ISFP
ISFJ - ISTP

ENTP - ENFJ
ENFP - ENTJ
ENTJ - ESTP
ENFJ - ESFP
ESTP - ESFJ
ESFP - ESTJ
ESTJ - ENTP
ESFJ - ENFP

When deriving the tertiary MBTI from a dominant -

1. the attitude (I/E) remains the same, but is reinforced by the tertiary (tertiary users will probably score as high as 100% on the I/E scales).

2. The Dominant letter remains the same (the T in Ti, the S in Si).

3. The Auxiliary letter changes to its opposite (S to N, T to F).

4. And J/P changes to its own opposite.
Wait. Wouldn't ENTP be Ne-Ti-Fe while ENFJ would be Fe-Ni-Se?

So should #3 be the Tertiary of the second is the opposite of the Primary of the first?

Cuz in the case of ENTP-ENFJ, #3 as described isn't true.

I haven't checked the others, though.

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