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- W2068586312 abstract "Abstract The development of ultradian periodicity at 1 cycle/h in electroencephalogram (EEG) variables and the coalescence of these variables with other somatic and autonomic parameters at hourly periodicities were examined in 23 normal infants at 1 week and at 1, 2, 3, 4, and 6 months of age in order to assess the organization of physiologic parameters which underlie the composition of sleep states. Each minute of a 12-h all-night sleep recording was assessed for the median heart and respiratory rate and variability, as well as for the integrated amplitude of the electromyogram, eye movement, and EEG activity at 0 to 1.5, 4 to 7, and 12 to 14 Hz. The amount of hourly periodicity was determined with spectral techniques, and coalescence between variables was examined with coherence procedures. The hourly organization of 12- to 14-Hz EEG activity increased with age, and the hourly organization of low-frequency, 1.5-Hz EEG activity became weaker. Relative to slower ultradian rhythms, however, activity in all three EEG bands increased during the 1- to 3-month period and then declined. The establishment of a high degree of coupling between EEG parameters and other physiologic variables required 3 to 4 months of development, a time frame which parallels the development of stable sleep state organization. Certain variables, such as respiration, showed an earlier time course for increased coherence with EEG parameters than did other parameters. These data suggest that the assessment of coupling between physiologic parameters at the hourly ultradian rhythm may provide an objective assessment of neurological development. They also suggest that the classification of sleep states might be aided by examination of the temporal organization of covarying physiologic parameters." @default.
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- W2068586312 date "1981-07-01" @default.
- W2068586312 modified "2023-10-16" @default.
- W2068586312 title "Development of ultradian periodicity and coalescence at 1 cycle per hour in electroencephalographic activity." @default.
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- W2068586312 doi "https://doi.org/10.1016/0014-4886(81)90050-9" @default.
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