Helen, an 11-year-old girl with autism, goes to mainstream school and does very well at all the subjects. But no one at school has ever heard her speak. She used to sit quietly in the classroom rocking her body and seems oblivious to everybody around her. However, her written work is always neat and correct. Her mother says she talks to her family at home, always whispering, but only if there is nobody else present there. If the family’s friends come to visit, she turns into