Jung, as such, describes in detail the effects of tensions between the complexes associated with the dominant and inferior differentiating functions in highly and even extremely one-sided types.

[4] Jung's interest in typology grew from his desire to reconcile the theories of Sigmund Freud and Alfred Adler, and to define how his own perspective differed from theirs.

So long as the radical difference between [Adler's] ego-psychology and [Freud's] psychology of instinct is not recognized, either side must naturally hold its respective theory to be universally valid.[6]: par.

This [type-antagonism] discovery brought with it the need to rise above the opposition and to create a theory which would do justice not merely to one or the other side, but to both equally.

Both are painfully inclined to reduce high-flown ideals, heroic attitudes, nobility of feeling, deep convictions, to some banal reality, if applied to such things as these.

On no account should they be so applied...In the hand of a good doctor, of one who really knows the human soul...both theories, when applied to the really sick part of a soul, are wholesome caustics, of great help in dosages measured to the individual case, but harmful and dangerous in the hand that knows not how to measure and weigh.[7]: par.

Psychological functions are a form of mental activity that remain the same in principle under different conditions and cannot be reduced to each other.

Repressed subjective judging in an extraverted feeling type leads to a surfacing of undeveloped, negative ideas that deprecate what is valued, and an absolutist character for them.

In an extraveted thinking type, selfish intentions surface, the person becomes overly sensitive and dogmatic, and loses sight of everything not relevant to the formula or cause.

Extraverted irrational types are guided simply by events as they happen, without constant judgement, and they base themselves on experiences.

Repressed subjective perception in an extraverted sensation type causes an unscrupulous search for stimulation, and unconscious intuition supplies wild suspicions, phobias, superstitions, and religious streaks.

If objective judging is repressed, they become inflexible, navel-gazing, egotistical, and develop feelings of inferiority that they compensate for in the real world.

Introverted irrational types are captivated by their subjective perception and inner world, chiefly as related to the collective unconscious.

The introverted sensation type is guided by their perceptions that are merely suggested by the object in the moment, related to its aesthetic, becoming, and passing.

Intuition, on the other hand, receives from the sensation only the impetus to immediate activity; it peers behind the scenes, quickly perceiving the inner image that gave rise to the specific phenomenon, i.e. the attack of vertigo, in the present case.

In this way introverted intuition perceives all the background processes of consciousness with almost the same distinctness as extraverted sensation senses outer objects.

When objective perception is repressed in an introverted sensing type, compulsive thoughts of external malevolence occur.

The introverted intuitive type becomes a hypochondriac, sensitive in the sense organs, and compulsively tied to particular people or objects.