multiple personalities

Multiple personality, or multiple personality disorders (MPD) is when a person is displaying two or more seperate personalities. These personalities often go by different names and the stronger new/stronger personality is often aware of the orignal/others whereas the original personality often just recalls 'blacking out'. Psychologists Thigpen and Cleckley conducted a study on a woman claiming to have 'blinding headaches', which concluded she infact was one of the vary rare cases of reported MPD victims. (For further reading, this study can be found here: http://www.holah.co.uk/, and is explained well in the film based on this study 'The Three Faces Of Eve').