Dissociative identity disorder is contentious because the rates of the disorder suddenly soared in the 1980s and then rapidly decreased and also because people may fake symptoms to avoid penalty.
In the 1970s, the diagnosis of dissociative identity disorder increased dramatically after the journal of the extremely popular book, Sybil, 1973. In the 1970s alone, more cases of DID were reported than in all of history since 1816 and the well-known case of Mary Reynolds.
Dissociative disorders concern problems with memory, identity, emotion, behavior, and sense of self. Dissociative symptoms can disrupt every region of mental functioning.
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