To confuse the audience, Hitchcock hired six uncredited people to play the mother. Mrs. Bates was played by Mitzi Koestner, Anna Dore, and Margo Epper as body doubles; and voiced by Virginia Gregg, Jeanette Nolan, and Paul Jasmin (a friend of Perkins). The voices were thoroughly mixed, except for the last speech, which is all Gregg 's.
who was the voice of mrs bates in psycho
Virginia Gregg Jeanette Nolan Paul Jasmin