Figure 3
Simulated electric potentials in the head at time 0 s, generated by dipoles which oscillated at 39 Hz, with positive potentials shown in red and negative potentials in blue. (a) Potentials on the whole scalp; (b) Potentials in the coronal plane; (c) Potentials in the right ear region seen from inside the head (note that (a–c) have different scales); (d) Waveforms of potential differences between electrode pairs on the scalp and inside the ear canal. The T8 and Cz positions are standard on-scalp EEG electrodes and further abbreviations are: RE D: Right ear canal, downward direction; RE U: Right ear canal, upward direction; RE H: Right ear, root of the helix. The positions of the ear electrodes are marked with black circles in panel (c).
