Objective: This study investigated the presence and nature of EEG clusters within a clinically-referred
sample of children with Attention-Deficit/Hyperactivity Disorder (AD/HD), and whether behavioural differences
exist between clusters.
Method: Participants were 155 boys with AD/HD and 109 age- and gender-matched controls. EEG was
recorded during an eyes-closed resting condition and Fourier transformed to provide estimates for total
power, and relative delta, theta, alpha, and beta. EEG data were grouped into 3 regions, and subjected to
Cluster Analysis. Behavioural data for each cluster were compared against the remaining AD/HD subjects.
Results: Four EEG clusters were found. These were characterised by (a) elevated beta activity, (b) elevated
theta with deficiencies of alpha and beta, (c) elevated slow wave with less fast wave activity, and (d) elevated
alpha. An exploratory analysis of behavioural correlates with these EEG subtypes indicated the
presence of interesting trends that need further investigation.
Conclusions: This study found that the AD/HD EEG profiles reported in past studies are robust and not
substantially affected by the inclusion of children with other comorbid conditions. The observed group
differences in behavioural profiles indicated that different patterns of EEG activity have importance in
Significance: This is the first study to link behavioural profiles of children with AD/HD to specific EEG