Figure 2.

Mean magazine responding in Experiment 2 during conditioned stimulus (S1, S2) and pre stimulus periods in the light and dark or during early and late intervals over 4-session blocks for the groups trained with visual (A) or temporal (B) ambiguous occasion setting tasks. Responding is shown on trials in which the target stimuli are reinforced (+ or *) or not (−) depending upon which conditional cue is present. Panel C displays the empirical mean +/− SEM discrimination scores across training for each group, and panel D shows the implied mean discrimination scores derived from statistical analysis (as in Figure 1).