In DSM-IV-TR, an uncommon condition, generally, although not specifically, present in small children, distinguished by a chronic failure to talk in various interpersonal circumstances, despite having the capability to talk as well as to comprehend spoken language. Age of onset is generally prior to five years, and the failure to talk continues a minimum of one month. Typically, these people perform adequately in other ways, though some possess various other disabilities. Almost all master age-appropriate abilities and educational subject matter. Presently believed to be related to social phobias or extreme anxiety. Actual cause is not presently known.
SELECTIVE MUTISM: "The child exhibited selective mutism in social situations."