I was pondering the possibility of sub-axis to the MBTI cognitive functions. In particular I have wondered about the Feeling function. I have struggled with determining if my Fi or Fe is stronger because I have certain aspects of both, and lack certain aspects of both. The following is a hypothesis which shows two axis instead of one. Such things could be applied to the other functions by separating the concept of "i" and "e" into the point of reference (the vantage point from which the system is viewed) and the location of the dynamic system, which may not have to be both internal or external. This idea could possibly be applied to the other functions, but this is the only one for which I have given any thought in applying the idea. I find myself clearly in one quadrant and wonder how this applies to others. What do you think of this hypothesis and/or have you come across other attempts at a higher resolution image of cognitive functions which create clear sub-axis of some sort?
Definition of terms (the italicized portions are from dictionary.com)
Introversion = the state of being concerned primarily with one's own thoughts and feelings rather than with the external environment. The point of reference is inside self.
Extroversion = the state of being concerned primarily with things outside the self, with the external environment rather than with one's own thoughts and feelings. The point of reference is outside self.
Intrapersonal = Existing or occurring within the individual self or mind. These are the dynamics within the internal system of an individual.
Interpersonal = pertaining to the relations between persons. These are the dynamics in the external systems of people.
An internal point of reference concerned with the dynamics that occur within the self. This focus is on self-awareness.
An internal point of reference concerned with the dynamics that occur between others and self. This focus is on harmony with others.
An external point of reference concerned with the dynamics that occur within individuals outside the self. This focus is on individual empathy.
An external point of reference concerned with the dynamics that occur between individuals outside of the self. This focus is on hosting, caretaking, and maintaining the community.