Table 2.

Design Summary of Experiments 2 and 3

Groups	Phase 1	Phase 2	Phase 3	Test Exp 2	Interval	Test Exp 3
Pre-Acq	24 S	4 X-S	4 S-US	2 X	21 days	2 X
Post-Acq	4 X-S	24 S	4 S-US	2 X	21 days	2 X
Ctrl-Acq	- - -	4 X-S	4 S-US	2 X	21 days	2 X
	4 X-S	- - -
Pre-OV	24 S	4 AX-S	4 S-US	2 X	21 days	2 X
Post-OV	4 AX-S	24 S	4 S-US	2 X	21 days	2 X
Ctrl-OV	- - -	4 AX-S	4 S-US	2 X	21 days	2 X
	4 AX-S	- - -

Note. Pre = outcome pretraining exposure, Post = outcome posttraining exposure, Ctrl = control, Acq = acquisition control, OV = overshadowing, X = target cue, A = overshadowing cue, S = surrogate outcome, US = footshock unconditioned stimulus, “-” = sequential pairing of stimuli, “- - -” = no treatment. Numbers refer to the number of each trial type. Control groups were composed of two subgroups that received X-S or AX-S trials either in Phase 1 or Phase 2. In Experiment 2, baseline recovery was conducted immediately after Phase 3 treatment and followed by testing, whereas in Experiment 3, baseline recovery and testing were delayed 21 days. During this retention interval, subjects remained in their home cages without any experimental manipulation.