title: Quantitative EEG in low-IQ children with attention-deficit/hyperactivity disorder.
abstract: OBJECTIVE
  This study investigated EEG differences between children with attention-deficit/hyperactivity disorder (AD/HD) and matched control subjects, with either normal or low IQs.
  
  
  METHODS
  Twenty normal-IQ and 20 low-IQ children with AD/HD, and 40 age-, IQ- and sex-matched control subjects participated in this study. EEG was recorded from 21 sites during an eyes-closed resting condition and Fourier transformed to provide estimates for total power, and absolute and relative power in the delta, theta, alpha and beta bands.
  
  
  RESULTS
  Children with AD/HD had increased theta activity with decreased levels of alpha and beta activity compared to control subjects. IQ was not found to impact on the EEG. No significant differences were found between subjects with normal and low IQs, with the low- and high-IQ AD/HD groups having similar EEG profiles.
  
  
  CONCLUSIONS
  Low-IQ children with AD/HD have similar EEG abnormalities to those with normal IQs, and IQ does not appear to impact on EEG power measures.
  
  
  CONCLUSIONS
  This is the first study to investigate EEG differences in low-IQ children with and without AD/HD.
authors.affiliation: School of Psychology, Brain and Behaviour Research Institute, University of Wollongong, Northfields Avenue, Wollongong 2522, NSW, Australia. adam_clarke@uow.edu.au
authors.forename: Adam R
authors.initials: AR
authors.lastname: Clarke
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Barry
authors.forename: Rory
authors.initials: R
authors.lastname: McCarthy
authors.forename: Mark
authors.initials: M
authors.lastname: Selikowitz
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Magee
authors.forename: Stuart J
authors.initials: SJ
authors.lastname: Johnstone
authors.forename: Rodney J
authors.initials: RJ
authors.lastname: Croft
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000150:complications / Q000503:physiopathology*; D001921:Brain / Q000502:physiology*; D002648:Child; D004569:Electroencephalography; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000150:complications / Q000503:physiopathology*; D007361:Intelligence Tests; D008297:Male