"Over-valence is a notion about possibilities in the human mind, possibilities of something going wrong, that did it not exist it could not be supposed. I mean by this simply that you have to see an over-valent idea at work fully to appreciate it. The older term is idée fixe. Over-valent idea expresses it better, because this is a term derived from mechanics and chemistry and biology; it is a graphic term and it involves the notion of power. The essence of valence is power and that is what I am talking about; I speak of an idea that once it comes into the human mind, the mind, I mean, of a given human being, it not only never goes away, it also consumes everything else in the mind so that, finally, the person is gone, the mind as such is gone, and only the over-valent idea remains." The Transmigration of Timothy Archer ~PKD
Original https://soundcloud.com/scilentsymphony/ambivalence