A 6-year-old boy has difficulty making friends and problems with initiating and sustaining back-and-forth conversation. He also has trouble reading social cues and sharing his feelings with others. He has a range of affect that generally seems appropriate to the situation, makes good eye contact, displays appropriate facial gestures, and has normal speech intonation. He demonstrates an interest in space ships that seems abnormally excessive in intensity and focus. He engages in little imaginative play. Which of the following diagnostic requirements for autism spectrum disorder are NOT met in this case?