"Thigpen, C.H. & Cleckley, H. (1954) A case of multiple personality." http://www.holah.co.uk/study/thigpen/

I've always thought that "Sybil" and "Bridey Murphy" were somehow related in a netherworld of someones fantasy. However, a previous study by Thigpen and Cleckley has stood up. I remember reading it shortly after it came out and thinking that it was somehow surreal.

Apparently multiple personality disorders have a sound theoretical basis but are much like amnesia. There are more of them faked than exist to this degree. It can be convenient.

We all have something of a multiple personality. Clearly the person in the midst of a temper tantrum is exhibiting another personality as are some people who get quite nervous or afraid.

And then there's Geraldine Jones, and "the devil made me do it". www.youtube.com/watch?v=uMlg4EGJSHk