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Computer Measures of Sleep EEG Reliably Sort Visual Stage 2 Epochs by NREM Period of Origin
Author(s) -
Fein G.,
Floyd T.C.,
Feinberg I.
Publication year - 1981
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1981.tb01844.x
Subject(s) - non rapid eye movement sleep , electroencephalography , psychology , discriminant function analysis , linear discriminant analysis , audiology , sleep stages , sleep (system call) , polysomnography , developmental psychology , cognitive psychology , artificial intelligence , statistics , neuroscience , computer science , mathematics , medicine , operating system
Computer measures of sleep EEG were employed to test the hypothesis that waveforms in visually scored epochs of stage 2 differ systematically according to their NREM Period (NREMP) of origin. The subjects were two groups of young adult males. Three waveform measures for each of five frequency bands were applied to 20‐sec epochs of visually scored stage 2. The raw data were converted to standard scores, eliminating differences in means and variances, thus highlighting the trends across NREMPs. Discriminant analysis revealed systematic differences in waveform pattern according to whether the visually scored stage 2 epochs originated from NREMPs 1–4. The discriminant functions were validated by successful prediction of NREMP of origin in the second sample. This result provides further evidence that change rather than constancy characterizes the EEG of human sleep. These data also illustrate the limitations of visual sleep stage scoring, which lumps together epochs of EEG which are reliably different. We suggest that the methods employed here will prove fruitful in the investigation of sleep as a function of age and in different clinical conditions.