Fig. 2.

Time-frequency spectrograms of phase-locking values for implicit face processing trials for PTSD (left column) and control soldiers (right column), in the angry (top row) and happy (bottom row) conditions. PLV values during the ‘Baseline’ period (denoted by the B, -100 to 0 ms) were subtracted from the ‘Active’ window (0 to 900 ms). Warm colours indicate an increase in phase locking relative to baseline, or ‘ongoing’, phase synchrony. Both groups showed stimulus-dependent (presented at 0 ms) increases in inter-regional phase locking that peak around 175 ms, evident when viewing both types of emotional faces, although these phase-locking responses are particularly pronounced in the PTSD group.