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Mean (+ SEM) activity rates (counts per minute) on the first (C1: Solid bars) and last (C4: Cross-hatched bars) pairs of conditioning trials for each strain within the (A) 0 g/kg, (B) 2 g/kg, and (C) 4 g/kg dose groups (collapsed across conditioning subgroups). Activity was averaged across the CS+ and CS−trials since there was no effect of trial type. Each bar for the 0-g/kg group represents 9–13 mice, whereas each bar for the ethanol-injected groups represents 18–25 mice.
