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. 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

Figure 3.

Figure 3

Mean suppression ratio to the target cue (X; left) and the overshadowing cue (A; right) in Experiment 1. Strong fear to the CS is denoted by a low suppression ratio. During training, X was paired with a footshock US in compound with an overshadowing cue (A) in the Pre-OV and Ctrl-OV groups, whereas X was paired with the US without any other stimulus present in the Pre-Acq and Ctrl-Acq groups. US-alone exposures were administered before the X–S or AX–S pairings in the Pre-Acq and Pre-OV groups, whereas the Ctrl-Acq and Ctrl-OV groups received no US-alone exposure. Error bars represent the standard error of the mean.