Twenty-year-old Fred lives in a group home. His only "speech" includes segments of TV commercials. He becomes very anxious and agitated when his routine is disrupted and he doesn't like to be touched. His social skills are very limited, and he does not show emotion to others. He has a narrowed focus of attention on one video game that he plays and plays over and over again. He likes to spin objects such as pens, pencils, and markers. At times he may mechanically repeat a sentence that he overheard someone else say. Fred is suffering from which disorder?