A few weeks ago I came across a terrific article about the treatment of selective mutism in five-year-old male twins written by a prominent psychologist named Dr. Katherine K. Dahlsguard. She is the lead practitioner of the Anxiety Behaviors Clinic at Children’s Hospital of Philadelphia. In the case described in the article, she astutely ruled out a language disorder in the twins, explaining that the boys exhibited normal language development as toddlers. Additionally, she pointed out that idioglossia—the technical term for […]