Fig. 1.

Multielectrode configurations. The figure illustrates the two BenGun configurations. The “+” setup allows for a 2-mm track adjustment in the x or y plane (anterior, posterior, medial or lateral). The “x” setup allows for a 1.4 mm adjustment in the combined x-y plane (anteromedial, anterolateral, posteromedial or posterolateral). The dotted lines represent the distance in millimeters from the central channel; this remains the same when rotating the holder. A, anterior; M, medial; P, posterior; L, lateral.