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 symptoms described suggest that the child is autistic. Repetitive arm flapping is a common behavior in individuals with autism, and a sudden change in the environment (such as the adult pulling the shade down) can cause agitation or distress. Down syndrome, muscular dystrophy, and rubella do not typically cause these specific symptoms.

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