Subclinical rhythmic EEG discharge of adults (SREDA) is an unusual rhythmic EEG pattern seen in adults. We present the findings in 23 cases of this pattern and compare this group of patients with the earlier group of 65 patients reported by Westmoreland and Klass in 1981. The findings in both groups were similar with regard to age distribution, morphology, type of onset and location of the discharge. Some additional variations, however, were noted in the present study, including location of the discharges and type of onset. As previously noted, the SREDA pattern was seen in patients with diverse complaints and showed no relationship to seizure disorders, cerebrovascular disease, or other specific disease entities. Therefore, the pattern should be considered as a nonspecific finding that is of little diagnostic significance.