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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Behav Processes. 2013 Jun 7;0:4–14. doi: 10.1016/j.beproc.2013.05.015

Figure 3.

Figure 3

Experimental conditions and observed results of Denniston, Blaisdell, and Miller (2004, Experiment 1). (A) Negative summation was observed for XD but not for XC when the temporal relationship of A and the US was revalued. (B) However, without revaluation of the A-US temporal relationship, negative summation was observed for XC but not for XD. Open rectangles and letters represent conditioned stimuli; black rectangles represent the footshock unconditioned stimulus. CR = strong conditioned responding; cr = little or no conditioned responding.