History
In 1877, a German physician named the disorder aphasia voluntaria to describe children who were able to speak normally but often "refused" to.
In 1980, a study by Torey Hayden identified four "subtypes" of Elective Mutism:
- Symbiotic mutism: the most common form, caused by a vocal and dominating mother and absent father (very rarely the other way around) and characterized by the use of mutism as controlling behavior around other adults.
- Speech phobic mutism: the least common, in which the child showed distinct fear at hearing a recording of his or her voice. This also involved ritualistic behaviors, which may reflect OCD, and was thought to be caused by the child having been told to keep a family secret.
- Reactive mutism: a reaction to trauma and/or abuse, with all children showing symptoms of depression and being notably withdrawn, usually showing no facial expressions. Notably, Hayden admits that some children put in this category had no apparent incident to react to, but they were included because of their symptoms.
- Passive-aggressive mutism: silence is used as a display of hostility, connected to antisocial behavior. Some of the children in her study had reportedly not been mute until age 9-12.
The Diagnostic and Statistical Manual of Mental Disorders (DSM), first published in 1952, first included Elective Mutism in its third edition, published in 1980. Elective mutism was described as "a continuous refusal to speak in almost all social situations" despite normal ability to speak. While "excessive shyness" and other anxiety-related traits were listed as associated features, predisposing factors included "maternal overprotection", mental retardation, and trauma. Elective mutism in the third edition revised (DSM III-R) is described similarly as in the third edition except for specifying that the disorder is not related to social anxiety disorder.
In 1994, the fourth edition of the DSM reflected the name change to selective mutism and redefined the disorder.
Read more about this topic: Elective Mutism
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