VRDigitizer localization results for a single subject (S06).

In (A) and (B), the green and gray circles indicate fiducials and electrodes measured for the VRDigitizer TwoTrackers condition, while the blue and black circles indicate fiducials and electrodes measured for the Brainsight reference condition; the colors of the lines connecting corresponding electrodes across the two datasets are indicative of the magnitude of localization error. Interpolated localization error is plotted with the same color scale on a projected 2D scalp topography in (C). Here, the two datasets were aligned by electrodes, and the subject’s scalp surface was aligned by the reference dataset anatomical fiducials. Electrodes appear offset from the scalp surface due to the selected digitization point for each electrode being on the top surface of the 3-mm thick electrode mount.