Kropotov J.D. ERPs correlates of EEG relative beta training in ADHD children

Received 17 September 2003; received in revised form 21 May 2004; accepted 24 May 2004
Available online 25 July 2004Eighty-six children (ages 9–14) with attention deficit hyperactivity disorder (ADHD) participated in this study. Eventrelated
potentials (ERPs) were recorded in auditory GO/NOGO task before and after 15–22 sessions of EEG biofeedback. Each
session consisted of 20 min of enhancing the ratio of the EEG power in 15–18 Hz band to the EEG power in the rest of
spectrum, and 7–10 min of enhancing of the ratio of the EEG power in 12–15 Hz to the EEG power in the rest of spectrum
with C3-Fz electrodes’ placements for the first protocol and C4-Pz for the second protocol. On the basis of quality of
performance during training sessions, the patients were divided into two groups: good performers and bad performers. ERPs of
good performers to GO and NOGO cues gained positive components evoked within 180–420 ms latency. At the same time, no
statistically significant differences between pre- and post-training ERPs were observed for bad performers. The ERP differences
between post- and pretreatment conditions for good performers were distributed over frontal–central areas and appear to reflect
an activation of frontal cortical areas associated with beta training.
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