Introduction Electroencephalography (EEG) and Magnetoencephalography (MEG) provide temporal special information on electrophysiological processes within the human brain. While the temporal information can be exactly recovered on a millisecond-by-millisecond basis (or even below), the spatial information is distorted in several Introduction Electroencephalography (EEG) and Magnetoencephalography (MEG) provide temporal special information on electrophysiological processes within the human brain. While the temporal information can be exactly recovered on a millisecond-by-millisecond basis (or even below), the spatial information is distorted in several