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. 2009 Dec 23;35(4):1016–1025. doi: 10.1038/npp.2009.207

Figure 1.

Figure 1

Background behavioral characterization. The cognitive status of aged and young rats was assessed in a standardized water maze task before intervention experiments. Higher learning index scores signify worse performance by reflecting search at a greater distance from the escape location during memory probe tests. Aged rats that performed beyond the normative range of young adult rats in this study population were selected for the present studies. *p=0.001.