DBS-electrode specifications.

<p>(a) The quadri-polar DBS-electrode was stereotactically implanted in the right hippocampus (AP -5.6, DV -7.4, ML +5.2 relative to Bregma [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133245#pone.0133245.ref043" target="_blank">43</a>]) together with four anchor screws. The outer two electrodes are used for stimulation and the inner two electrodes for iEEG. The red dot represents the electrode insertion location on the skull. The black dots indicate anchor screw positions. (b) Illustration of the quadri-polar DBS-electrode. The MRI-compatible electrode is custom made by twisting together four platina iridium wires. The unused connection pin is reserved for connection to a ground-electrode, which is subcutaneously implanted in the neck. (c) Illustration of the DBS-electrode after fixation to the skull.