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Reducing the WS:ITI ratio fails to impair avoidance with a 240 sec warning signal. (A) Total avoidance responses emitted across 10 sessions of training. (B) Mean percent avoidance by session. (C) Mean Session 10 freezing expressed as a percentage of Session 1 freezing. N = 8/group (four females, four males). Bars represent separate groups. Bar height indicates group mean. Dots represent individuals. Error bars = S.E.M. (*) P < 0.05 for 240 sec versus 60 sec WS groups.
