Average participant response locations for each HMD condition across speaker positions in the (a) front, (b) back, (c) left, and (d) right hemispheres. Only responses that fell within a 45° aperture cone around the actual source location are considered, discarding confusions to focus on local accuracy errors. Ellipses represent the standard error of the major and minor axes of the data variance obtained using the Kent distribution, after Leong and Carlile [13].