Behavioral and quantitative electroencephalography (EEG) techniques were used to evaluate treatment response to stimulant therapy in children with attention disorders. A sample of 130 children with attention disorders were evaluated with Conners and Diagnostic and Statistical Manual of Mental Disorders--III rating scales, and with neurometric quantitative EEG before and 6 to 14 months after treatment with stimulants. Significant quantitative EEG differences were found between the normal control population (N = 31) and the children with attention problems. Quantitative EEG abnormalities involved increased theta or alpha power, greatest in frontal regions, frontal theta/alpha hypercoherence, and posterior interhemispheric power asymmetry. Behavioral improvement after stimulant treatment was seen in 81.5% of the children with attention-deficit hyperactivity disorder and 44.7% of the children with attention-deficit disorder, with the degree of correspondence between behavioral and quantitative EEG changes at 78.5%. Pretreatment clinical and quantitative EEG features could predict treatment response with a sensitivity of 83.1% and a specificity of 88.2%. A combined behavioral and quantitative EEG approach can be useful for following and predicting treatment response to stimulants in children with attention disorders.