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Sleep state periodicity in prematures and young infants
Author(s) -
Stern Evelyn,
Parmelee Arthur H.,
Harris Margaret A.
Publication year - 1973
Publication title -
developmental psychobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 93
eISSN - 1098-2302
pISSN - 0012-1630
DOI - 10.1002/dev.420060409
Subject(s) - rhythm , sleep (system call) , quiet , circadian rhythm , audiology , sleep patterns , psychology , pediatrics , developmental psychology , medicine , physics , quantum mechanics , computer science , operating system
An autocorrelation technique was used to determine the periodicity underlying successive recurrences of specific sleep states (Quiet Sleep and Active Sleep). Groups of short (2–3 hr) polygraphic records and individual all‐night recordings were analyzed. Active Sleep and Quiet Sleep periodicities at 32 weeks conceptional age were 12 min. At 36 weeks, 40 weeks (term), and 1, 3, and 8 months, the periodicity of both Active and Quiet Sleep was consistently in the 40–60 min range. At all ages, the cycle time of one state was consistently longer than the other. The appearance of clear periodicities underlying both states and the similarity of the periodicities found in 36 week records to those found in much older infants' records indicate that this biological rhythm is basic to human CNS functioning. The Index of Rhythmicity values in these records and other investigators' data suggest that this rhythm reaches a mature form by 36 weeks postconception.