Stage N2
4. Continue to score epochs with low-amplitude, mixed frequency EEG activity without K complexes or sleep spindle as stage N2 if they are preceded by epochs containing either of the following and there is no intervening arousal:
5. Epohs following an epoch of the stage N3 that do not meet criteria for stage N3 are scored as stage N2 if there is no intervening arousal and the epoch dose not meet criteria for stage w or stage R.
4. K complex나 sleep spindle 이 없는 낮은 진폭의 혼합주파수 EEG activity가 보이는 epoch는 그 이전에 K complex가 arousal과 관련되어 있거나 sleep spindle이 있는 epoch가 존재하고, 그 사이에 각성이 없다면 N2로 판독한다.
5. N3단계의 epoch다음 N3기준을 충족하지 못하는 epoch는 만일 그 사이에 arousal이 없고 해당 epoch가 stage W, stage R을 만족하지 않는다면 N2로 판독한다.
6. End scoring stage N2 sleep when ONE of the following events occurs.
6. StageN2의 종료는 다음과 같은 조건 중 하나가 있을 때 이다.
Figure 10. End of stage N2 due to a major body movement. The EEG is assumed to contain low-amplitude, mixed frequency activity unless otherwise depicted.
그림 10. Body movement로 인해 stage N2가 끝난다. EEG가 뇌파의 변화가 다른 수면단계로 설명되지 않는 한 LAMF를 포함하여 N2로 지속된다.
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Stage N3
Slow wave activity: Waves of frequency 0.5 Hz-2 Hz and peak to peak amplitude >75 ㎶, measured over the frontal regions referenced to the contralateral ear or mastoid (F4-M1, F3-M2)
2. Score stage N3 when ≥20% of an epoch consists of slow wave activity, irrespective of age.
Stage N3는 다음의 정의에 따라 판독한다.
1. Slow wave activity: 주파수가 0.5~2Hz 사이이며, 파형의 최고 정점에서 저점까지의 진폭이 75 ㎶ 이상이어야 한다. 이 파형은 F4-M1, F3-M2의 뇌파유도에서 측정한다.
2. stage N3는 epoch의 20%인 6초 이상 slow wave activity가 나타날 경우 N3로 판독하며 기준은 나이에 관계없이 적용된다.
Note 1. Stage N3 represents slow wave sleep and replaces the Rechtschaffen and Kales nomenclature of stage 3 and stage 4 sleep.
Note 2. K complexes would be considered slow waves if they meet the definition of slow wave activity.
Note 3. Pathological wave forms that meet the slow wave activity criteria, such as those resulting from neurological impairment, encephalopathy, or epilepsy, are not counted as slow wave activity of sleep. Similarly, waveforms produced by artifact or those of non-cerebral origin should not be included in the scoring of slow waves.
Note 4. Sleep spindles may persist in stage N3 sleep.
Note 5. Eye movements are not typically seen during stage N3 sleep.
Note 6. In stage N3, the chin EMG is of variable amplitude, often lower than in stage N2 sleep, and sometimes as low as in stage R sleep.
Note 7. Due to reported difficulty correctly identifying qualifying slow waves, >75 ㎶ lines inserted in the recording or identification of delta waves by concurrent digital analysis, may assist the scorer. Candidate slow waves may by marked such that the total duration of slow waves may be quantified.
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