Another way to study the brain is the use of electroencephalograms, or EEGS, which measure electrical wave activity. EEG studies performed in Edmonton, at the University of Alberta, have cast some light on how ADD may be reflected in brain functioning. 3 The EEGS of a group of preadolescent boys with ADD were compared with those of a matched group of non-ADD peers. The two groups had similarly normal EEGS at rest, but the ADD group showed excessive “slow wave” activity during directed tasks such as reading or drawing.