Improved Spatial Resolution of Electroencephalogram Using Tripolar Concentric Ring Electrode Sensors

Figure 4

A comparison, at a location near the center of the array, of the calculated spline Laplacian “,” TCRE Laplacian “o,” and the analytical Laplacian, the gold standard “+.” The spline Laplacian was calculated from the disc electrode potentials. The disc electrode potentials were calculated from a uniform density of points over the outer ring of the 1.0 cm diameter TCRE similar to the way the outer ring of the TCRE was used as an emulation of the conventional disc electrode in real visual evoked potential experiments based on their equivalency [21–23]. The tripolar Laplacian matches the analytical Laplacian trace very well.