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(Adapted from Grillon et al., 2009) Average startle magnitudes in PTSD patients and healthy controls across three levels of contextual aversiveness: 1) neutral context (low threat), during which no unpleasant stimulation was delivered, 2) predictable context (moderate threat) during which unpleasant stimulation was given predictably, and (3) unpredictable context during which unpleasant stimulation could be given at any time.
