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KMID : 0389520030100010052
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Sleep Medicine.Psychophysiology
2003 Volume.10 No. 1 p.52 ~ p.60
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Automatic Detection of Stage 1 Sleep Utilising Simultaneous Analyses of EEG Spectrum and Slow Eye Movement
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Shin Hong-Beom
Han Jong-Hee
Jeong Do-Un
Park Kwang-Suk
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Abstract
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Objectives; Stage 1 sleep provides important information regarding interpretation of nocturnal polysomnography, particularly sleep onset. It is a short transition period from wakeful consciousness to sleep. The lack of prominent sleep events characterizing ale 1 sleep is a major obstacle in automatic sleep stage scoring. In this study, utilization of simultaneous EEG and EOG processing and analyses to detect stage 1 sleep automatically were attempted.
Methods: Relative powers of the alpha waves and the thea waves were calculated from spectral estimation. A relative power of alpha waves less than 50% or relative power of theta waves more than 23% was regarded as stage 1 sleep. SEMlow eye movement) was defined as the duration of both-eye movement ranging from 1.5 to 4 seconds, and was also regarded as stage 1 sleep. If one of these three criteria was met, the epoch was regarded as stage 1 sleep. Results were compared to the manual rating results done by two poysomnography experts.
Results: A total of 169epochs were analyzed. The agreement rate for stage 1 sleep between automatic detection and manual sco ring was 79.3% and Coheris Kappa was 0.586 (p<0.01). A significant portion (32%) of automatically detected stage 1 sleep in cluded SEM.
Conclusion: Generally, digitally?scored sleep staging shows accuracy up to 70%. Considering potential difficulty in stage 1 sleep scoring, accuracy of 79.3% in this study seems to be strong enough. Simultaneous analysis of EOG differentiates this study from previous ones which mainly depended on EEG analysis. The issue of close relationship between SEM and stage 1 sleep raised by Kinnari remains a valid one in this study. Sleep Medicine and sychophysiology 2003 ; 10(1) : 52-60
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KEYWORD
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Digital analysis, EEG, Slow eye movement, Stage 1 sleep,
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