This study focuses on Implicit learning (IL) in children One of the main debates in this field concerns the Occurrence of IL indicators in experimental settings and its manifestation in different populations In this research, we are looking for evidence of the occurrence of IL in normal children and in children with Attention Deficit Hyperactive Disorder (ADHD). based on the relationship between accuracy. reaction time and event-related potentials (ERPs). Our results show differences between the analyzed groups with respect to markets for electrophysiological activity and reaction time. but not for accuracy In consequence, we Suggest that research in IL should explore different indicators and their relationship with the cognitive processing levels involved In addition, IL might involve different forms of information processing in normal children and children with ADHD. We discuss the possible impact of these findings for future research (C) 2009 Elsevier Inc All rights reserved