User blog comment:Crazywarfire/Indoctrination Theory is BS/@comment-98.232.252.119-20120730091933/@comment-5318090-20120819225427

Actually it does either ME1 or ME2's Indoctrination Codex entry specifically says that as the Indoctrination process progresses a person may hear ghostly voices or suffer from hallucinations culminating in the Reaper being able to subplant the person's willpower.