Figure 9From: From wavelets to adaptive approximations: time-frequency parametrization of EEGTime-frequency energy distribution (equation 5) of 20 seconds of sleep EEG; structures corresponding to sleep spindles are marked by letters A-F. Structures C and D, as well as E and F, were classified as one spindle, i.e. their centers fell within a time section marked by expert as one spindle's occurrence. [23]Back to article page