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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: Neuroimage. 2010 Dec 2;55(1):113–132. doi: 10.1016/j.neuroimage.2010.11.037

Fig. 1.

Fig. 1

Illustration of the spatio-temporal decomposition model. The cortical currents and the HRFs within a parcel are assumed to be temporally coherent, i.e., the temporal shape is the same but with different scales, which are modeled by the time invariant spatial profile w. The spatial profile links the EEG and fMRI modalities since wi controls the scale of the current response as well as the scale of the HRF at the i-th vertex. This is illustrated here for two parcels and three waveforms per parcel; the waveforms belonging to the same vertex are drawn with the same color.