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Journal of Attention Disorders
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Rethinking a Right Hemisphere Deficit in ADHD

T. Sigi Hale

UCLA Semel Institute for Neuroscience and Human Behavior, sig{at}ucla.edu

Sandra K. Loo

UCLA Semel Institute for Neuroscience and Human Behavior

Eran Zaidel

UCLA Brain Research Institute

Grant Hanada

UCLA Semel Institute for Neuroscience and Human Behavior

James Macion

UCLA Semel Institute for Neuroscience and Human Behavior

Susan L. Smalley

UCLA Semel Institute for Neuroscience and Human Behavior

Introduction: Early observations from lesion studies suggested right hemisphere (RH) dysfunction in ADHD. However, a strictly right-lateralized deficit has not been well supported. An alternatively view suggests increased R > L asymmetry of brain function and abnormal interhemispheric interaction. If true, RH pathology in ADHD should reflect interhemispherically networked and overactivated functioning. The authors evaluated these assertions. Method: Four elements of lateralized brain function were measured: LH specialized, RH specialized, LH with interhemispheric processing (LH/IH), and RH with interhemispheric processing (RH/IH). Next, the authors tested their association with cognitive ability, psychiatric comorbidity, and sibling correlations in 79 children with ADHD. Results: RH/IH processing was uniquely associated with other outcome measures. There were no associations for independent RH or LH function alone. Conclusion: Interhemispherically networked RH processing is critical in ADHD. In addition, lack of association between LH specialized processing and cognitive ability (especially for verbal cognitive tasks) supports increased RH mediation of task processing.

Key Words: ADHD • laterality • asymmetry • hemisphere • attention

This version was published on July 1, 2009

Journal of Attention Disorders, Vol. 13, No. 1, 3-17 (2009)
DOI: 10.1177/1087054708323005
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