Spontaneous EEG Rhythms and their fMRI Correlates

A major limitation of the routinely used clinical EEG lies in the ambiguous assignment of measured brain potentials to anatomic structures. By means of simultaneous EEG-fMRI the non-invasive imaging of structural correlates of EEG rhythms has become feasible, thus improving the interpretability of EEG findings. During MRI acquisition, however, large artifacts are induced in the EEG signal, making the physiological EEG unrecognizable. We employed a mathematical algorithm for artifact removal and validated this algorithm by means of visual evoked potentials (VEPs) recorded during and between MRI acquisition period…