EEG-Based Automatic Sleep Staging Using Ontology and Weighting Feature Analysis

Table 1

Different combination criterions of six sleep stages.

Combination criterion	Sleep stages
Six-state	WA, NREM1, NREM2, NREM3, NREM4, REM
Five-state	WA, NREM1, NREM2, SWS, REM
Four-state	WA, light sleep, SWS, REM
Three-state	WA, NREM, REM
Two-state	WA, sleep

Note. Light sleep: NREM1 and NREM2 are pooled into a single stage. SWS: NREM3 and NREM4, are pooled into a single stage. Sleep: NREM1, NREM2, NREM3, NREM4 and REM are pooled into a single stage.