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A recent study into ADHD symptoms have connected the disorder with deficient brain activity. Researchers showed that children diagnosed with ADHD have more difficulty completing simple tasks because the strength of signal their brain produces is less than that of a child not diagnosed.

Researchers asked children to make a counting movement with one hand; then, the researchers watched for movement in the other, inactive hand. Children diagnosed with ADHD were more likely to "mirror" the counting motion of the active hand with the inactive hand.

Researchers then looked at brain scans taken during the exercise and found that the distracted mirroring was owed to the brain's inability to effectively shut down the inactive side of the body.

"The findings reveal that even at an unconscious level, these children are struggling with controlling and inhibiting unwanted actions and behavior," researcher Stewart Mostofsky, MD, of the Center for Autism and Related Disorders at the Kennedy Krieger Institute in Baltimore, said in a news release.

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