Journal of Abnormal Child Psychology

, Volume 22, Issue 5, pp 561–578

Methylphenidate influences on both early and late ERP waves of ADHD children in a continuous performance test

  • M. N. Verbaten
  • C. C. E. Overtoom
  • H. S. Koelega
  • H. Swaab-Barneveld
  • R. J. van der Gaag
  • J. Buitelaar
  • H. van Engeland
Article

DOI: 10.1007/BF02168938

Cite this article as:
Verbaten, M.N., Overtoom, C.C.E., Koelega, H.S. et al. J Abnorm Child Psychol (1994) 22: 561. doi:10.1007/BF02168938

Abstract

Although it has frequently been reported that hyperactive children have abnormally small P3 amplitudes of the event-related potential (ERP), which are normalized by the stimulant drug methylphenidate (MPH), the literature is inconsistent concerning earlier ERP waves. The aim of the present study was to investigate whether the normalizing effect of a 10-mg dose of MPH was also apparent on earlier waves, such as the N1, the P2, and the N2, besides the P3. Twelve attention deficit with hyperactivity disorder (ADHD) children performed a Continuous Performance Test involving a button-press response to the letter X (CPT-X) under the influence of MPH in a double-blind placebo controlled acute dosage design. ERPs were recorded at Oz, Pz, Cz, and Fz. The expected increase of the parietal P3, both to targets and nontargets, was apparent, as well as a significant increase in percentage of hits. There also was a significant increase of an earlier, negative going, wave, the N2, with a frontal maximum, under the influence of MPH. This wave was probably a manifestation of an increase in processing negativity for target stimuli only, after the intake of the stimulant drug. No effect of MPH was found on the N1 or the P2.

Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • M. N. Verbaten
    • 1
  • C. C. E. Overtoom
    • 1
  • H. S. Koelega
    • 1
  • H. Swaab-Barneveld
    • 2
  • R. J. van der Gaag
    • 2
  • J. Buitelaar
    • 2
  • H. van Engeland
    • 2
  1. 1.Faculty of Pharmacy, Section PsychopharmacologyUniversity of UtrechtCA UtrechtThe Netherlands
  2. 2.Department of Child PsychiatryUtrecht UniversityThe Netherlands