ez and Bablioyantz, 1991). A “pathologically low’ leading 4(+)was also found to be characteristic of the EEG of patients with Alzheimer’s syndromes (Jeong et al, 1998). Technically defined sleep stages (I, Il, Ill, IV, REM) were found to correlate well with the values of the leading 4(+) of the EEG in normal