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Hemispheric Processing and Methylphenidate Effects in Attention-Deficit Hyperactivity Disorder

Division of Neurology, Departments of Paediatrics and Psychology, The Hospital For Sick Children

John R. Kershner, PhD

Ontario Institute for Studies in Education, University of Toronto, Toronto, Ontario

James M. Swanson, PhD

Department of Pediatrics, University of California, Irvine, CA

To advance our understanding of attention-deficit hyperactivity disorder and medication effects we draw upon the evidence for (1) a neurotransmitter imbalance between norepinephrine and dopamine in attention-deficit hyperactivity disorder and (2) an asymmetric neural control system that links the dopaminergic pathways to left hemispheric processing and links the noradrenergic pathways to right hemispheric processing. It appears that attention-deficit hyperactivity disorder may involve a bihemispheric dysfunction characterized by reduced dopaminergic and excessive noradrenergic functioning. In turn, favorable medication effects may be mediated by a restoration in neurotransmitter balance and by increased control over the allocation of attentional resources between hemispheres. (J Child Neurol 1994;9:181-189).

Journal of Child Neurology, Vol. 9, No. 2, 181-189 (1994)
DOI: 10.1177/088307389400900216


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