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    Kids With ADHD Have Distinct Brain Patterns

    Researchers Working Toward Developing a Test for ADHD
    WebMD Health News
    Reviewed by Laura J. Martin, MD

    Nov. 28, 2011 (Chicago) -- Children with attention deficit hyperactivity disorder (ADHD) process visual information differently than children without the disorder, preliminary research shows.

    By finding distinct patterns of activity in the brains of children with ADHD, researchers hope to someday develop an early test for the disorder.

    The findings were presented here at the annual meeting of the Radiological Society of North America.

    Pattern of Brain Activity Different in Children With ADHD

    Researchers used a specialized brain scan called a functional MRI to watch brain activity in 18 children aged 9 to 15 with ADHD and 18 children of the same ages without the disorder.

    Functional MRI allows doctors to see how the brain reacts to different types of activity.

    While undergoing the brain scans, the children took a series of tests in which they were shown a set of three numbers and then asked whether additional sets matched the original numbers.

    The test requires the children to pay attention and visualize, remember ,and compare the numbers, says study leader Xiaobo Li, PhD, assistant professor of radiology at the Albert Einstein College of Medicine in New York City.

    "What we found," she tells WebMD, "is that the pattern of brain activity for processing visual attention information looks a little different in children with ADHD."

    Specifically, the scans of children with ADHD showed less activity in brain regions involved in visual attention and working memory, Li says.

    Much Work Remains

    If the same pattern of brain activity is confirmed in other studies of children with ADHD, it could serve as an indicator for the disorder, Li says. Doctors, then, could use functional MRI scans to look for the pattern of activity as soon as, or even before, symptoms develop, she says.

    But first, researchers have to make sure the pattern is distinct to ADHD and not shared by other childhood disorders, Carol Rumack, MD, professor of radiology and pediatrics at the University of Colorado Anschutz Medical Campus in Aurora, tells WebMD.

    Plus, it would be prohibitively expensive to use functional MRI scans as a screening tool for thousands of youngsters, she says. A scan can cost $3,000 to $5,000, she says, though the price tag could come down in the future.

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