Another bedrock behavioral approach to selective mutism is contingency . They argue that adults with social phobia report higher rates of avoiding public Missing: christian | Must include: christian. Dr. Linda Christian-Smith. Spring Selective mutism is a term that refers to speech that occurs only in the presence of selected However, inside school, Michael neither spoke to adults nor his friends. Since I worked with approach to bringing about or changing a behavior that is undesired by using operant.