Investigation of sleep spindles properties and distributions

Previous section defined a filter, which chooses from the atoms, fitted to the analyzed signal by a general MP procedure, those corresponding to sleep spindles. Its application provides--in a completely automatic fashion--precise time-frequency parameters of all the sleep spindles present in a multichannel overnight EEG recording. For a clear visualization of this huge amount of information, several types of reports present parameters of selected atoms (or corresponding sleep spindles) in different coordinates. These reports are projections of multidimensional space of spindle's parameters onto 2- (or 1-) dimensional subspaces, suitable for presentation of given phenomena.