Janet is a three-year-old girl who lives with her parents in a suburban neighborhood. Janet's mother is a full-time homemaker who spends much of her time caring for her daughter. Janet spends hours daily staring into the air, oftentimes seeming to poke or grab at dust particles in the air, rocking back and forth in a sitting position on the floor, and repeatedly saying phrases from television commentary. Janet does not make eye contact, communicate with spoken language, or seek cuddling with her mother, though she does take her mother's hand to lead her when she wants juice from the refrigerator. Janet rarely plays with toys her parents offer, other than lining the blocks or toys up in an arrangement and resisting with extreme ...