Figure 2: Craniotomy and Schematic of Seizure Focus Localization by Triangulation. Left: Image of an exposed portion of the brain of an epileptic patient undergoing a craniotomy. A 5x4 array of grid electrodes (white) is pictured. Right: magnification of a section of the grid electrodes annotated with a schematic of seizure focus localization by triangulation. Each electrode is circumscribed with a radius corresponding to the distance between that electrode and the mock seizure focus. The point at which the three circles intersect marks the location of the estimated seizure focus.