Subjects' MEG **data** were aligned by using their individual headframe coordinate system defined through the nasion point and the two ear canals. A t-value difference map was calculated comparing ZLVBDD i values of PTSD patients and controls on a voxel-by-voxel basis. Using AFNI (Analysis of functional neuroimages [44]) the t-value difference map was overlaid with the CH2 brain template (see Figure 1).