Dipole source analyses of the N170 to faces performed at each angle of orientation. A. Location of the two symmetrical dipoles (FG and MOG) and the computed MSPS result from the grand averaged ERP data for each face rotation are shown in an anatomical brain atlas space (the MNI averaged brain) on axial and coronal planes. The red color indicates the activity picked up by the MSPS. The activity is located near the FG and MOG dipoles, which suggests that the source model is adequate. B. Location of the two symmetrical FG and MOG sources from the grand averaged ERP data for each face rotation are displayed in a 4-shell spherical head model (BESA), with rear and lateral views, and their corresponding activity strength, expressed in units of nano-ampere-meters (nAm). C. The absolute values of the mean amplitude of the left and right FG and MOG source activity strengths are plotted against stimulus orientation. Data plotted are means (n = 15) and vertical ranges represent + 1 SEM.