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Retardation test in Experiment 1. PreX-X differences (±SEM), averaged for the 10 X+ presentations per session in the retardation test, are displayed. The black line represents the group that was trained with 14 A+, two AX−, 12 F−, and two X− presentations per session in conditioning. The gray line represents the group that was trained with 14 A+, two BX, 12 F−, and two X− presentations per session. In the retardation test, both groups received 10 X+ presentations per session.
