Neuroelectrical signs of selective attention to color in boys with attention-deficit hyperactivity disorder

In order to gain insight into the functional and macroanatornical loci of visual selective processing deficits that may be basic to attention deficit hyperactivity disorder (ADHD), multi-channel event related potentials recorded from 24 7-11-yr-old boys clinically diagnosed as having ADHD and 24 age-matched healthy control boys while they performed a visual (color) selective attention task. The spatio-temporal dynamics of several ERP components related to attention to color were characterized using topographic profile analysis, topographic mapping of the ERP and associated scalp current density distributions, and spatio-temporal source potential modeling. Boys with ADHD showed a lower target hit rate, a higher false-alarm rate, and a lower perceptual sensitivity than controls. Also, whereas color attention induced in the ERPs from controls a characteristic early frontally maximal selection positivity (FSP), ADHD boys displayed little or no FSP. Similarly, ADHD boys manifested P3b amplitude decrements that were partially lateralized as well as affected by maturation. The data also support the hypothesis that the visual selective processing deficits observed in the ADHD boys originate from deficits in the strength of activation of a neural network comprising prefrontal and occipito-temporal brain regions.