The findings were presented in November 2011 at the annual meeting of the Radiological Society of North America (RSNA), held in Chicago, IL, USA. ADHD is one of the most common childhood disorders, affecting an estimated five to eight percent of school-aged children. Symptoms, which may continue into adulthood, include inattention, hyperactivity, and impulsivity behaviors that are out of the normal range for a child’s age and development.

According to the US National Institute of Mental Health (Bethesda, MD, USA), there is no single test capable of diagnosing a child with the disorder. As a result, difficult children are often incorrectly labeled with ADHD while other children with the disorder remain undiagnosed.

“Diagnosing ADHD is very difficult because of its wide variety of behavioral symptoms,” said lead researcher Xiaobo Li, PhD, assistant professor of radiology at the Albert Einstein College of Medicine (New York, NY, USA). “Establishing a reliable imaging biomarker of ADHD would be a major contribution to the field.”

For the study, Dr. Li and colleagues performed fMRI scanning on 18 typically developing children and 18 children diagnosed with ADHD (age range 9 to 15 years). While undergoing fMRI scanning, the children engaged in a test of sustained attention in which they were shown a set of three numbers and then asked whether succeeding groups of numbers matched the original set. For each participant, fMRI produced a brain activation map that revealed which areas of the brain became activated while the child performed the task. The researchers then compared the brain activation maps of the two groups.

Compared to the normal control group, the children with ADHD showed abnormal functional activity in several regions of the brain involved in the processing of visual attention data. The researchers also found that communication among the brain areas within this visual attention-processing pathway was disrupted in the children with ADHD.

“What this tells us is that children with ADHD are using partially different functional brain pathways to process this information, which may be caused by impaired white matter pathways involved in visual attention information processing,” Dr. Li said.

Dr. Li noted that much of the study conducted on ADHD has centered on the impulsivity part of the disorder. “Inattention is an equally important component of this disorder,” she said, “and our findings contribute to understanding the pathology of inattentiveness in ADHD.”

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