title: [Cognitive evoked potentials in the hyperactivity attention deficit disorder].
abstract: BACKGROUND
  The Attention Deficit Hyperactivity Disorder, ADHD, is characterized by deficient attention, impulsiveness and excessive motor activity. The incidence is estimated between 5 and 9% of children of school age. The P300 wave is one of the cognitive components of the event related potential ( ERP) that is more used to investigate the attention and the cognitive processes.
  
  
  OBJECTIVE
  The aim of this study was to investigate the information processing in children with ADHD predominantly inattentive type by means of the visual and auditory P300 component.
  
  
  METHODS
  P300 wave using an auditory and visual oddball paradigm were recorded in 18 children with ADHD and in 18 normal children ( control group ).
  
  
  RESULTS
  We found differences in reaction time and in the percentage of errors between children with ADHD and between controls. In the ADHD the latency of the auditory and visual P300 were significantly longer than in the control group, and the amplitude of both components were significantly smaller in the ADHD group than in controls. We didn t found differences in the cortical distribution of the P300 between the two groups.
  
  
  CONCLUSIONS
  These data suggests that there is an abnormal processing of cognitive information in children with ADHD predominantly inattentives and a dysfunction in attentional mechanisms.
authors.affiliation: Servicio de Neurofisiolog a; Hospital Universitario del Mar, Barcelona, 08003, Espana. mariannf@eresmas.com
authors.forename: M
authors.initials: M
authors.lastname: Idiazábal Alecha
authors.forename: A B
authors.initials: AB
authors.lastname: Palencia Taboada
authors.forename: J
authors.initials: J
authors.lastname: Sangorrín
authors.forename: J M
authors.initials: JM
authors.lastname: Espadaler-Gamissans
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000503:physiopathology*; D001921:Brain / Q000503:physiopathology*; D002648:Child; D003071:Cognition / Q000502:physiology*; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D014888:Wechsler Scales