The experimental design, hypothetical temporal representations, and observed result of Polack, Molet, Miguez, and Miller (2013, Experiment 1). (A) Group Ext assessed whether integration resulted in a S1-US associative structure or could be the result of two independently learned interval maps that remain independently stored in memory. (B) Group Cont controlled for temporal integration. Open rectangles and letters represent conditioned stimuli; black rectangles represent the footshock unconditioned stimulus; each dashed line represents the retrieved activation of a representation. CR = strong conditioned responding.