In the presence of a dual, a specific type will try and provoke its dual into assisting it with its own dual-seeking function, regardless of its own competence in the related area of information (T/F/N/S).
This could be interpreted as a type switching from the conscious, devalued, and somewhat understood role function to the unconscious, valued, and poorly understood dual-seeking function, because both the role function and the dual-seeking function deal with the same type of information.
When the dual inevitably provides assistance with the dual-seeking function of the specific type, the specific type discards the role function and begins to rely on the dual to deal with information related to the role and dual-seeking functions.
Let me use my own type, LII, and my dual's type, ESE, as examples.
Without external stimulus, the LII deals with the area of ethics through Fi, and remains somewhat confident in his/her ethics-related abilities. The behavior demonstrated in this mode of operation is rigid, cold, and polite behavior as defined by the surrounding society, without superfluous emotions.
Without external stimulus, the ESE deals with the area of logic through Te, and remains somewhat confident in his/her logic-related abilities. The behavior demonstrated in this mode of operation is the hasty manipulation of facts to achieve material goals, without taking the time to slow down and understand the process.
With external stimulus from a Fe-ego type, the LII, seeing an alternative approach to ethics, discards any previous notion about ethics-related information and tries to attract Fe towards him/herself in order to replace devalued Fi. This is exemplified by statements that draw attention to how lacking in Fe the LII is. These statements may be exaggerated to gain the sympathy of the dual.
With external stimulus from a Ti-ego type, the ESE, seeing an alternative approach to logic, discards any previous notion about logic-related information and tries to attract Ti towards him/herself in order to replace devalued Te. This is exemplified by statements that draw attention to how lacking in Ti the ESE is. These statements may be exaggerated to gain the sympathy of the dual.
This is the effect that I see as responsible for the gradual loss of self-reliance in dual relations and for the intentional adaptation of dual traits in dual relations.
Thoughts? If people request more concrete "for example" scenarios with actual types, I will post them. I plan to refine my views on Socionics over the summer when I have more free time.