Sleep Spindles as an Electrographic Element: Description and Automatic Detection Methods

Table 1

Main characteristics of sleep spindle (SS). SWO: Slow Wave Oscillations; coord: coordinates.

Parameters of SS	Measurement	Units
Individual properties
Main frequency	Mean intraspindle frequency	Hz
Intraspindle frequency	Rate of frequency changes	Hz/s
Duration	Time between start and end	s
Shape	Skewness and kurtosis	—
Scalp localization	EEG channel	coord
Source localization	Spindle origin	coord
Interplay	Delay between the nearest SWO and SS	s
Ensemble properties
Count	Number of SS	—
Density	Count by min (within cycles and sleep stages)	min^−1
Rate	Time interval between successive SS	s