Figure 2. Effects of AMPKα isoform reduction on recognition memory in aged mice. (A) Novel object recognition (NOR) experiments demonstrated that long-term recognition memory was impaired with aging in Cre+/- and AMPKα2 cKO mice. In contrast, aged AMPKα1 cKO mice showed normal recognition of novel objects over familiar objects. n=8 for Cre+/- and AMPKα1 cKO, n=10 for AMPKα2 cKO. **p<0.01. Unpaired two-tailed t-test. (B) Time spent with the novel object during the NOR test. n=8 for Cre+/- and AMPKα1 cKO, n=10 for AMPKα2 cKO. *p<0.05. One-way ANOVA and Tukey’s test. (C) NOR discrimination index [(time spent exploring novel object − time spent exploring familiar object) / total exploration time]. n=8 for Cre+/- and AMPKα1 cKO, n=10 for AMPKα2 cKO. *p<0.05. One-way ANOVA and Tukey’s test.