Equivalent to the conditioned or acquired aspect of character. The psychology of character. Evolving through the life of a character.
This aspect of character, the psychology if you like, is typically approached during preparation and rehearsal through rational, linear methods such as text analysis, and social and psychological typing.
However, it can also be assimilated subliminally and more organically via a kind of osmosis. That is to say, during active rehearsal, by the actor being open and responding physically to the interplay of character and situation. In this way the dramatic environment of the play (assuming it is well written) nurtures the development of the character. This approach more resembles the process of character evolution in real life, compared to an approach that imposes an interpretation from above. It is also easier to integrate it with that other aspect of character, its inborn musicality.
Introducing this aspect, the role of conditioning in forming beliefs, permits the portrayal of more sophisticated characters, propelled by more complex, often hidden objectives.