EEG registration in the MR scanner, however, is very susceptible to a variety of artifacts, particularly patient head movement and ballistocardiogram; the latter is related to head and body movements produced during systole. Despite having the head securely restrained, very small movements of the head produce high-amplitude, paroxysmal bursts on EEG that are impossible to differentiate from paroxysmal cortical epileptiform activity. This artifact results from currents produced by small movements of the EEG electrodes and wires …