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. Author manuscript; available in PMC: 2010 Mar 1.
Published in final edited form as: J Exp Psychol Anim Behav Process. 2010 Jan;36(1):126–136. doi: 10.1037/a0016055

Figure 3.

Figure 3

Design and hypothetical interval representation of Experiment 2. The light gray and the white squares represent cues CS1 (a 3-s click train) and CS2 (a 3-s tone), respectively. Footshock unconditioned stimuli (1.0 mA for 0.5 s) are represented by black rectangles under the time line. The ISI between the termination of CS1 and the onset of CS2 was either 5 s (denoted by large spaces between the cue CS1 and the cue CS2 representations) or 0 s (denoted by the lack of space between the cue CS1 and the cue CS2 representations). The ISI between the termination of the US and the onset of CS2 was 4.5 s. “/” means “unpaired with”; “CR” and “cr” indicate the expectation of robust and weak conditioned response, respectively, based on the TCH and Miller and Escobar's (2002) retrieval model.