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(A) Aversive thresholds determined in rats bearing (hatched columns) or not bearing (sham-open columns) electrolytic lesion of the vPAG. (B) Percentage of time spent freezing by rats with sham (hatched columns) or vPAG (open columns) lesions during 6 min. Pre refers to the baseline period; Post, to the testing session 24 h after conditioning. N = 8 for all groups, except for the freezing threshold (lesion = 8, control = 7).
