The EEG-fMRI analysis method for assessing the spatio-temporal dynamics of neuronal activation is illustrated in Figure 1. After the attenuation of biological and non-biological artifacts, in particular those induced by the fMRI scanning, the EEG signals are averaged, in order to obtain ERPs. A decomposition of the ERPs is performed at the group-level to highlight the event-related ICs, contributing to the neuronal processes related to task. Similarly, fMRI data are analyzed, in order to retrieve the large-scale networks accounting for the event-related responses. The fMRI network maps are used for the weighted localization of the ERP ICs, thus allowing their spatial characterization in the source space. Therefore, they are used for the analysis of neuronal activation timing across the different brain networks.
