Sometimes I like disassembling things to see how they work from the inside. The subject for today is MBTI code. Let's hope I will be able to put it together again at the end of this post 
At the heart of MBTI lies a theory of cognitive processes by Swiss psychiatrist Carl Jung. He was one of the founding fathers of the modern psychology and was mostly interested in how a healthy human mind works. After observing his patients and himself (he had some interesting hallucinating experiences at one point in his life) he came to a conclusion that there are several common trends in how people perceive information: either sensory or intuitive. The first is working with facts and direct input from one's five senses. The second (although sounds a bit mystical) can be described as perceiving in patterns. There was also a difference in how people process information (called judging function): using feelings or thinking. Ethics, emotions and morals against rational thought.
And so we have two central components of MBTI code: perceiving S/N and judging F/T. One can deduce the two middle letters of his or her code from this information. There are 4 possible combinations and most people on this forum have NF preference.
Next Jung drew a distinction that each function can be in one of the two attitudes: either extroverted or introverted. So a number of variables doubles: Si/Se, Ni/Ne, Fi/Fe, Ti/Te. One of them is dominant in a personality. It is here that we can deduce the first letter of MBTI code for it coincides with attitude of the dominant function. For INFJ it's Ni - that's why we have "I".
But it's not that easy to discover which of the two favorite functions is dominant: a person can be sure of NF preference and his/her introversion but still would not know if that's Fi or Ni responsible.
For that we have the final letter of the code which is often misinterpreted. As there are 8 cognitive functions (actually 4 with two different attitudes each) - there can be 16 possible pair combinations of them in a code. But only 8 are used by Jung for he concluded that perceiving and judging functions must be in opposite attitudes in a psyche. That means we cannot have Si and Ti as one's favorites - it can only be Se Ti or Si Te. Additionally extroverted function dominates over introverted during interactions. Thus a person who passively collects the information from the outside (introverted perceiving function) and then announces the decision (extroverted judging function) is called a judging type - marked by J in the code. In contrast a person who actively collects information (extroverted perceiving function) but would rather keep conclusions for themselves (introverted judging function) is called a perceiving type - marked by P in the code. That also means that Ni, Si, Te and Fe are only available exclusively to J types, while the rest belong to P.
Ironically for INFJs our dominant function is a perceiving one but we are called judging because of Fe. INFPs are dominant judging but are called perceiving because of Ne.
I hope that clears some misconceptions that J stands for Jedi (sorry Van) or for being organized.
The rest of the story introduces dichotomies in S<->N and F<->T scale. They must be of different attitudes for not to confront with each other. Having a preference for Ni means that a person can also use some of Se abilities and vice versa. That's why INFJs have access to Ti and Se which are favorites for ISTP. And that's why we love Slant so much even if we don't want to...
At the heart of MBTI lies a theory of cognitive processes by Swiss psychiatrist Carl Jung. He was one of the founding fathers of the modern psychology and was mostly interested in how a healthy human mind works. After observing his patients and himself (he had some interesting hallucinating experiences at one point in his life) he came to a conclusion that there are several common trends in how people perceive information: either sensory or intuitive. The first is working with facts and direct input from one's five senses. The second (although sounds a bit mystical) can be described as perceiving in patterns. There was also a difference in how people process information (called judging function): using feelings or thinking. Ethics, emotions and morals against rational thought.
And so we have two central components of MBTI code: perceiving S/N and judging F/T. One can deduce the two middle letters of his or her code from this information. There are 4 possible combinations and most people on this forum have NF preference.
Next Jung drew a distinction that each function can be in one of the two attitudes: either extroverted or introverted. So a number of variables doubles: Si/Se, Ni/Ne, Fi/Fe, Ti/Te. One of them is dominant in a personality. It is here that we can deduce the first letter of MBTI code for it coincides with attitude of the dominant function. For INFJ it's Ni - that's why we have "I".
But it's not that easy to discover which of the two favorite functions is dominant: a person can be sure of NF preference and his/her introversion but still would not know if that's Fi or Ni responsible.
For that we have the final letter of the code which is often misinterpreted. As there are 8 cognitive functions (actually 4 with two different attitudes each) - there can be 16 possible pair combinations of them in a code. But only 8 are used by Jung for he concluded that perceiving and judging functions must be in opposite attitudes in a psyche. That means we cannot have Si and Ti as one's favorites - it can only be Se Ti or Si Te. Additionally extroverted function dominates over introverted during interactions. Thus a person who passively collects the information from the outside (introverted perceiving function) and then announces the decision (extroverted judging function) is called a judging type - marked by J in the code. In contrast a person who actively collects information (extroverted perceiving function) but would rather keep conclusions for themselves (introverted judging function) is called a perceiving type - marked by P in the code. That also means that Ni, Si, Te and Fe are only available exclusively to J types, while the rest belong to P.
Ironically for INFJs our dominant function is a perceiving one but we are called judging because of Fe. INFPs are dominant judging but are called perceiving because of Ne.
I hope that clears some misconceptions that J stands for Jedi (sorry Van) or for being organized.
The rest of the story introduces dichotomies in S<->N and F<->T scale. They must be of different attitudes for not to confront with each other. Having a preference for Ni means that a person can also use some of Se abilities and vice versa. That's why INFJs have access to Ti and Se which are favorites for ISTP. And that's why we love Slant so much even if we don't want to...
