A device developed by an associate professor at Harvard Medical School is designed to help doctors diagnose children with attention-deficit/hyperactivity disorder. A motion tracker in the Quotient diagnostic device can detect the movements of a child with ADHD and distinguish them from those of a child without the disorder, according to its developer. The test has been approved by the Food and Drug Administration, but some critics say the device is an updated version of an older test shown to be unreliable and no longer commonly used.

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