Figure 4.

Experiment 1. Global analysis of blocking (pooled data for training and test). (Left) Percentage of PER in the six conditioning trials of the first training phase (preconditioning with a single odor, A or N). (Middle) Percentage of PER in the six conditioning trials of the second training phase (compound conditioning with AB). §Significant difference between sixth preconditioning trial and the first compound-conditioning trial. (Right) Percentage of PER in the extinction test. Response to B was significantly higher in the novel than in the block group.