From Split to Psycho: why cinema fails dissociative identity disorder

M Night Shyamalan’s new movie, Split, stars James McAvoy as a character with 23 different personalities. And, like most screen portrayals of the disorder, it is seen as dangerous and violent. But what’s the truth behind the stigma?Tom Hanks played six different characters in Cloud Atlas, Eddie Murphy played seven in The Nutty Professor and Alec Guinness notched up eight in Kind Hearts and Coronets. But James McAvoy sets a new benchmark with his new movie, Split. He plays Kevin, a man