Figure 8.

Control interface for simulating electrode trajectories. From top to bottom: “Path radius” defines the maximum distance of visualized nodes from the virtual electrode. “Use Depth Tool” visualizes only nodes near the “tip” of the virtual electrode by constraining the depth. Only nodes whose depth does not deviate more than “Depth tool tolerance” are marked. Depth is measured along the virtual electrode track with zero depth being defined as the intersection of the electrode track with the outer brain surface. The virtual electrode is advanced by moving the slider below “Depth tool tolerance.” The current depth is indicated to the right of the slider and the search results are updated in real-time. “Grid orientation” allows specifying electrode locations relative to the center of the recording chamber in a coordinate system that is rotated with respect to the default coordinate system (see Materials and Methods). The electrode location is specified by clicking on one of the red and blue grid points.