Review of a journal article by Troy Janzen, Ken Graap, Stephan Stephanson, Wilma Marshall, and George Fitzsimmons
"Differences in Baseline EEG Measures for ADD and Normally Achieving Preadolescent Males"
Biofeedback and Self-Regulation, Vol. 20, No. 1, 1995, pp. 65-82.
Three well known tests (WISC-R, WRMT-R, WRAT-R) were administered to all subjects prior to the main part of the study, a series of cognitive tests performed while connected to a 19 lead EEG cap.
Findings: The most consistent finding was that ADD subjects have significantly higher theta amplitudes (p < .05) for all sites at both baseline and while performing cognitive tasks. There were also differences in the ratios of theta to beta and theta to SMR for baseline and all tasks at all sites, but the differences were significant only for some tasks at the parietal sites. The raw beta and SMR amplitudes themselves were not significantly different between the two groups.
The authors conclude that although the number of subjects was small, there were significant differences that could be observed. These findings form a starter set of data for additional efforts.