Abstract
The application of automated analysis in the measurement of sleep electroencephalogram delta activity allows a more precise temporal description of slow wave sleep changes in normal and pathological aging than do standard, all-night, slow wave sleep measures. Thus, with a baseline crossing technique, elderly depressives were shown to have a higher delta count per minute during the second NREM sleep period than did controls or demented subjects. This difference reflected greater activity per minute in the 2-3 Hz frequency band (75-200 microV).
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