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Reducing WS–US contingency does not improve avoidance. (A) Mean percent avoidance by session. (B) Mean avoidance response (AR) latency by session. (C) Mean seconds freezing during warning signals for Sessions 1, 6, and 10. (D) Mean Session 10 freezing expressed as a percentage of Session 1 freezing. Squares represent individuals. N = 8/group (4 females, 4 males). Error bars = S.E.M. (*) P < 0.05 versus 100% WS–US contingency group.
