“Regeneration Trilogy” by Pat Barker (post 2): Do author and other scholars know that a person with an “alternative personality” has multiple personality?

In my previous post, Pat Barker is quoted as saying that the behavior of one of her major fictional characters in The Regeneration Trilogy is based on a real person who had had an “alternative personality” since childhood.

Do the author, the interviewer, and the book’s editors know that having an alternative personality since childhood means having multiple personality, and that if the behavior of a character is based on such a person, then the character has multiple personality, too?

Judging from the index of the book, they may not know it. The index does make reference to psychiatric diagnoses—“post-traumatic stress disorder” and “hysteria”—but not to multiple personality (1).

1. Sharon Monteith, Margaretta Jolly, Nahem Yousaf, Ronald Paul (Editors). Critical Perspectives on Pat Barker. University of South Carolina Press, 2005.