VERTICAL EYE-MOVEMENT DURING REM SLEEP: EFFECTS OF AGE AND ELECTRODE PLACEMENT.

All-night sleep studies were carried out in young adults and aged normal subjects. Eye-movement (EM) was recorded as electro-oculogram from each subject with two different electrode placements. In young adults a placement which responded to vertical as well as to horizontal EM yielded scores for EM activity about one-third greater than those obtained with a placement which responded only to horizontal movements. In addition, the two placements differentially affected estimates of stage 1 EEG. These effects were less marked in aged subjects who were found to have fewer vertical EMs than young adults. It was hypothesized that the proportion of vertical eye-movement reflects the intensity of REM sleep processes. [ABSTRACT FROM AUTHOR]

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