From Eric Kvaalen
Your article on multiple personality disorder (MPD) takes the perhaps thinly veiled position that it is not a valid diagnosis (28 September, p 46).
However, a few years ago you published an article on MPD that cited the case of a German woman in 1791 who suddenly began having episodes in which she acted like a French woman who had fled the Revolution (15 March, 2008, p 52). She would speak perfect French, and spoke German like a French person would. This case was not induced by a psychologist. There are many other examples.
The fact that MPD can be induced or faked does not mean that it doesn’t exist “naturally”.
Les Essarts-le-Roi, France
