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Most folks have only ever taken online tests, which are crap, and based on random interpretations of the actual MBTI. Even the official test that you pay to get done, in person, from the MBTI folks, is pretty inaccurate. So almost no one is typed accurately.
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I'm not sure what you mean. The categories of the MBTI are very useful, but only if you actually are using them, and not looking at some random "fake news" silliness. I suggest the original book Gifts Differing, if you really want to learn about it.
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The polarities boil down to risk-aversion/input-needs focus vs. novelty-seeking/output-needs in 4 basic evolutionary brain regions: motor cortex, limbic system, neocortex, and prefrontal cortex. Which are, respectively, physical, emotional, intellectual, and philosophical.
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If this was in Jung's original design (the brain thing) then that's news to me, do you have a link to his writing on that? Did they even know about brain regions like that at the time?
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This isn't Jung. This is specifically the MBTI, which was an update of Jung's stuff. And I've updated the MBTI to include modern neurology, psychology, and developmental theories from everyone I could find. (Ken Wilbur, Spiral Dynamics, Maslow, Elizabet Satouris, me, etc.)
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