Scientists discover a brain signal that may trigger autism’s domino effect

The brain relies on countless chemical messages to keep its networks running smoothly. One way to imagine this system is like traffic lights guiding cars through a busy city. A new study focused on nitric oxide, a common chemical messenger in the brain. Researchers found that in some forms of autism, rising levels of this molecule may stop acting like a helpful signal and instead behave more like a "stuck button."

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