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AN ELECTROENCEPHALOGRAPHIC STUDY ON THE DEVELOPMENT OF NOCTURNAL SLEEP
Author(s) -
HIRAI Tomio,
TAKANO Ryoei,
UCHINUMA Yukio
Publication year - 1968
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1111/j.1440-1819.1968.tb01317.x
Subject(s) - sleep (system call) , sleep stages , nocturnal , electroencephalography , audiology , sleep spindle , stage (stratigraphy) , k complex , psychology , rhythm , delta wave , eye movement , slow wave sleep , medicine , polysomnography , neuroscience , biology , paleontology , computer science , operating system
SUMMARY Simultaneous over‐night recordings of EEG, ECG, respiration, body movements and the rapid eye movements had been carried out on 42 healthy children with ages ranging from 2 days to 15 years. Their behavior during sleep were also observed. 1. Six stages of the nocturnal sleep of children were classified. These stages were divided into 2 groups. The first group is consisted of the drowsy state (SI) and the activated sleep (SA), and the second group is consisted of the spindle stage (S2), the diffuse rhythmic θ (DRθ=S3) stage and the delta stage (S4). The second group lacked the rapid eye movements. 2. The spindle stage and the delta stage were similar to those of sleep in adults but the diffuse rhythmical θ stage (S3) was considered as one of the characteristics to the nocturnal sleep of children. With increasing age the diffuse rhthmic theta waves become less conspicuous and finally transform into the sleep pattern of spindle stage. 3. The average duration of the second group (S2, S3 and S4 stages) increased with age, whereas, that of the first group (Sl and SA stages) stayed constant throughout all ages. This explains the higher percent time of SA stage during total sleeping time in children than in adults.