. Author manuscript; available in PMC: 2007 Sep 27.

Published in final edited form as: J Exp Psychol Anim Behav Process. 2006 Jul;32(3):253–270. doi: 10.1037/0097-7403.32.3.253

Table 1.

Design Summary of Experiment 1

Groups	Conditioning (context train)	Test (context test)
Pre-Acq	36 US → 4 X-US	4X
Ctrl-Acq	- - - → 4 X-US	4X
Pre-OV	36 US → 4 AX-US	4X
Ctrl-OV	- - - → 4 AX-US	4X

Note. Pre = US pretraining exposure, Ctrl = control, Acq = acquisition control, OV = overshadowing, X = target cue, A = overshadowing cue, US = footshock unconditioned stimulus, “-” = sequential pairing of stimuli, “- - -” = no treatment. Numbers refer to the number of each trial type. Context train and context test differed in illumination of the chamber, the odors present, the material constituting the floor, and the presence of an operant lever.