You enter a room and see an average-looking child wildly flapping his arms repetitively for no apparent reason. You then notice that this child becomes extremely agitated when an adult pulls a shade on a window down just a few inches. As a knowledgeable psychology student, you would rightly surmise that this child

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The child's behavior of repetitively flapping his arms and becoming agitated over a small change in the environment suggests that he may have autism, a developmental disorder characterized by impaired social interaction, communication, and repetitive behaviors. This behavior is not indicative of Down syndrome, muscular dystrophy or rubella.

You Enter a Room and See an Average-Looking Child Wildly