Figure 1

Sparse time-frequency bump modeling of a toy EEG signal. (a) The toy EEG signal (Biosemi system, 2048 Hz sampling rate, 2 sec), recorded in rest condition with eyes closed, is first (b) transformed using complex Morlet wavelets, then (c) the map is z-scored (offset = 1). Sparse time-frequency bump modeling decomposes the z-scored map into a sum (d) of half ellipsoid (c) parametric functions (windows of 4 cycles, pruned to the 8 first bumps).