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Experiment 2. A: intake during the six 2B extinction trials (means ± SE). The group with asymmetric PBN and LH lesions (Asym) consumed more of the sucrose CS than the controls (Con). B: preference ratios for the 2B extinction trials are defined as the CS intake divided by the sum of the CS and water intake for each trial. Total fluid intake was equivalent, Asym = 14.2 ± 0.65 ml; controls = 14.7. ± 0.32 ml.
