. Author manuscript; available in PMC: 2010 Jun 1.

Published in final edited form as: Behav Processes. 2009 Feb 13;81(2):322–327. doi: 10.1016/j.beproc.2009.01.010

Table 1.

Design Summary of Experiment 1

Group	Phase 1	Phase 2	Test X
AX+	6 A+/6 X+	8 AX+	Cr
BX+	6 A+/6 X+	8 BX+	CR

Note: CSs A and B were a complex tone and a white noise exposure, counterbalanced within groups. 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.