View caption Rich Pedroncelli/AP
Instructional assistant Jessica Reeder touches her nose to get Jacob Day, 3, who has autism, to focus his attention on her during a therapy session in April 2007.
Scientists and parents have long been baffled by the fact that children with autism often don't pay attention to human voices. Researchers say that may be because speech doesn't activate a reward system in the brain for those children like it does for typical children.
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