This is from a post I made on another forum about Myers' interpretation of the auxiliary attitude:
Originally Posted by INTP
NOTE: The quotes are from Jung in Psychological Types and the italicized indented comment is from Myers in Gifts Differing. Whole post..
The relatively unconscious functions of feeling, intuition and sensation, which counterbalance introverted thinking, are inferior in quality and have a primitive, extraverted character. (1923, p. 489)
When the mechanism of extraversion predominates... the most highly differentiated function has a constantly extraverted application, while the inferior functions are found in the service of introversion. (1923, p. 426)
A more subtle kind of evidence lies in the "extraverted character" of the introvert's auxiliary process. For example, in a well-balanced ISTJ the observable auxiliary process, thinking can be seen to resemble the thinking of the extraverted thinker more than that of the introverted thinker. This point can be tested with any introvert by comparing the axuiliary process with Chapter 8, Figures 28-31, where the differences between extraverted and introverted thinking, extraverted and introverted feeling, etc., are shown.
This argument is easily refuted in Jung's introduction to the Principal an Auxiliary Functions section of the book:
Given that Jung is stating here that he deliberately and disproportionately singled out the types so as to emphasize their specific characteristics, then the preceding two quotes Myers offered, taken from the "foregoing descriptions," are equally disproportionate and singled out.
In the foregoing descriptions I have no desire to give my readers the impression that these types occur at all frequently in such pure form in actual life. They are, as it were, only Galtonesque family portraits, which single out the common and therefore typical features, stressing them disproportionately, while the individual features are just as disproportionately effaced.
Psychological Types, CW6, p666, pg 405
Furthermore, looking at the quotes Myers' grabbed, and considering the other half of Jung's introduction to the Principal and Auxiliary:
One could logically surmise that if the functions of feeling, sensation, and intuition had an extraverted character due to their relative unconsciousness, then it would stand to reason that the conscious auxiliary function would share the same Introverted attitude as the conscious dominant Thinking function. It wouldn't make sense for the auxiliary function to have the opposite attitude if the whole reason for that attitude was that the function, in this example, is unconscious. This same logic can be applied to the second quote about the Extraverted type.
Closer investigation shows with great regularity that, besides the most differentiated function, another, less differentiated function of secondary importance is invariably present in consciousness
and exerts a co-determining influence.