Figure 1.

A: Experimental design. Pictures were presented in a block design comprising four runs, each containing three blocks, one of each valence (positive, negative, and neutral) in a pseudo‐randomized order. Each block was preceded by a fixation block. In each block, eight pictures or fixation crosses were presented for 1.5 s, followed by 0.5 s of a black screen each time. B: Visual ERPs in control and PTSD subjects in response to the fixation cross. C: ERPs in control subjects in response to pictures versus fixation (left) and by stimulus emotional valence (right). Insets: enlarged traces. Arrow: negative emotion associated increased negative deflection. D: Averaged (all electrodes) ERS to emotional stimuli at the different frequency bands.