Table 2.

Design Summary of Experiment 2

Group	Phase 1	Phase2	Phase 3	Test X
AX+20	6 A+/6 X+	8 AX+	20 min	Cr
AX+80	6 A+/6 X+	8 AX+	480 min	Cr
X-20	6 A+/6 X+	8 X−	20 min	Cr
X-480	6 A+/6 X+	8 X−	480 min	CR

Note: CS A was a high frequency complex tone and CS X was a click train. All CSs were 10 s during training and 30 s during testing. The US (+) was a brief footshock. Slashes denote interspersed trials within sessions. CR (Cr) denotes a strong (intermediate) expected conditioned response based upon prior research. Training (Phases 1 and 2) was conducted in one context and testing was conducted in a physically distinct context.