Scenario i: simulated ictal source with stationary frequency at SNR = 0.9. (a) CPD. (b) CWT-BTD. The spatial, frequency and temporal signatures are shown on the upper, middle and bottom images, respectively. Only the components corresponding to the ictal source are shown. The spatial and frequency signatures of CPD and BTD are in agreement with each other and the true ictal source. The temporal signature of CPD closely follows the true underlying ictal pattern, while noise is superimposed on the two BTD signatures (T1a and T1b) constituting the rank-2 BTD term. Still, a fair assessment of the ictal pattern is possible.