[lsiq]

Foucault implied the same. Or at least, suggested that as the scientific definitions are created so too does the phenomena emerge. Ian Hacking expanded upon this and named this concept, dynamic nominalism.

That's why we had "madmen" in 19th century and that no longer exists, only to be subsumed by supposedly more specific new descriptions that psychologists have come up with.

The idea of dynamic nominalism is not that such a label as "Multiple Personality" is contrived but that the described phenomena becomes real. The two simultaneously and unconsciously converge, in a sense, to exist.

My own thought is that you can this expand concept for a lot of current & former social categories that are even broader - and not restricted to psychology, such as being a hippie. And also the social category that is currently in vogue.