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. Author manuscript; available in PMC: 2019 Jul 1.
Published in final edited form as: Hippocampus. 2018 May 4;28(7):512–522. doi: 10.1002/hipo.22950

Figure 2.

Figure 2

Food reward operant training and progressive ratio testing in rats and mice lacking adult hippocampal neurogenesis. There was a significant decrease in food reward intake during the fixed ratio (FR) training in TK rats relative to WT rats (A) but no difference in breakpoint during progressive ratio testing (B). TK mice showed no difference in time to earn 50 rewards during FR training (C) or in breakpoint during progressive ratio testing (D). n=10-13/genotype. * P<0.01. Data are means ±SEM.