Well, if you're playing with a GM who would do that, I doubt having rules for it would help matters much. Indoctrination is very similar to insanity, from a narrative point of view, and nothing ruins insanity in a game faster than using rules to define and regulate it. It shouldn't be a game mechanic, but rather a narrative tool. If you want to have rules for the GM's benefit, that the player shouldn't interact with, I suppose that's not so bad. But I don't know why any GM would want to restrict themselves with rules the players aren't aware of.