IntroductIon: various biological markers have been proposed as a signature of attention-deficit/hyperactivity disorder (ADHD), one of the most prevalent developmental disorders in children. We present a study of cognitive event-related potentials in a group of children with ADHD. Modulacion del componente P300 de los potenciales evocados en un grupo de ninos colombianos con trastorno de atencion-hiperactividad