EEG-fMRI is a measurement technique designed to capture the electrophysiological and hemodynamic
manifestations of brain activity synchronously.
Any single imaging method is limited to observing a limited aspect of brain function. The
combination of information about the electrical activity of the brain and the corresponding
hemodynamic changes, offering superior spatial information, appears as one of the most powerful
examples of multimodal imaging techniques capable of providing new insights into brain function.
While data acquired in separate sessions can be appropriate for some research questions, only
simultaneous EEG-fMRI offers the opportunity to relate both modalities to actual brain events, an
issue that is not only relevant in epilepsy, but also for numerous research questions in basic and
cognitive neuroscience. In these cases, extra efforts required to deal with the specific practical
problems of the combination are well justified in comparison to the potential extra-insights into
human brain function.