Temporal Distribution and Ontogenetic Development of EEG Activity During Sleep.

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    • Abstract:
      The purpose of this study was to investigate nightly patterns of temporal organization of EEG alpha, beta, delta, and sigma spindle activities and to measure changes in these patterns with age. A total of 50 nights of EEG recordings were obtained from normal subjects from various age groups, ranging from 3 to 79 yrs. A Sleep Analyzing Hybrid Computer (SAHC) measured min by rain amounts of each EEG waveform. The amount of beta activity occurring in the first half of the night increased with age, whereas the amount occurring later in the night decreased. An opposing trend was observed in the occurrence of delta activity. Alpha activity increased significantly for subjects in their 50's and increased tremendously after age 65. In the oldest group the alpha had developed a very definite ultradian pattern and appeared coincident with REM. This alpha-REM pattern was suppressed in the younger age groups. [ABSTRACT FROM AUTHOR]
    • Abstract:
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