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Online ratings of shock risk (0 = no risk, 1 = some risk, 2 = high risk) both before acquisition training (pre-acquisition) and after (generalization test). ITI = inter-trial interval; vCS− = v-shaped conditioned safety cue; oCS− = ring-shaped conditioned safety cue; GS 1 , GS 2 and GS 3 = three classes of generalization stimuli; CS+ = conditioned danger cue.
