Looking at the Wikisocion page for dual-type theory, one is cannot help but notice how very many things can be defined as "extroverted sensing" or "introverted intuition", because the elements assist in the processing of countless phenomena. Even considering the elements as master-slave pairs, the scope of variations within each of the 64 pairings is broad.
In recent years the study of the brain has made significant strides. The mental function of rhythmic timing, for example, has been correlated to a part of the brainstem. In supersocionics terms, this is Ni master with Ne slave: the information stream being processed is an ordered pattern of momentary happenings. If one were to respond to the timing itself with say, physical activity, then slave Se would be involved more than Ne: the one is a reaction or impulse to the flow of moments, completely impromptueven though it is expected; the other is the planned execution of an activity specific to its point in the sequence and contingent on the activities which preceded it and those which are planned to follow it. The point is that the various master-slave element pairings can be correlated to localized regions of the brain.
In leu of the relevance, therefore, of dual-type theory to a better understanding of the various aspects of our information processing, and the importance of having that understanding, I argue that it is profitable to observe the "elements within the elements" that reveal themselves in the variety of IM/IE expressions; that is, let us resolve to pinpointing all of those little variations, bit by bit, and let's see what they add up to when at last we have....