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Eye-blink startle reflex (A), skin conductance responses (B), and changes in heart rate (C) as a function of Block (first, second) and Instruction (threat, safety). Means (SEM) are plotted separately for each group: on the left side, the Angry–Neutral Group started with angry expression as threat cue, and on the right the Happy–Neutral Group with happy faces cueing threat in the first block. For both groups neutral faces served as reversed threat cue in the second block.
