"Well, if it's a widespread trait in the population and they've got any kind of history to them whatsoever, then they've probably developed some pretty strong social structures and psychological defense mechanisms to compensate for the kind of chaos that psychic eruption throws into the average brain," Ray points out. "I mean, they'd have died out otherwise. The only ones who live to breed are the ones who have some means of keeping their act together when the top of their head gets flipped open and their brains see the sunshine- metaphorically speaking, of course. It's pure Lamarckianism. If the psychically active parents find a way to keep themselves close to sane, say by really thorough meditation or something, their kids will have stronger mental structures- not genetically, but because of the behavior their parents transmit while they're raising them. Mendel's in charge of how the genes get transmitted, but Lamarck covers the transmission of social and psychological traits from generation to generation. And that's how you get sane psychic races."

It was good enough to get him an A from Professor Csordas back in his psychological anthropology class, once he persuaded the professor to let him write about theoretical or fictional populations in addition to existing human ones, but he's not about to let the doctor know that part.