**Figure 4.** **Long-term retention of everyday spatial memory in aging.** (**A**) Rats received a strong encoding (3 rewards, filled circle) trial and 30 min later different memory-modulating events. The novel box was represented in green, the encoding zone was represented in blue, and the second strong encoding trial was represented in orange. Twenty-four hours after encoding, they were tested in a probe trial with 5 non-rewarded sandwells (open circles). (**B**) After strong encoding, the percentage of correct digging was not different from chance (dashed line) in both groups (No prior training: one-sample *t*-test, t_{12} = 1.58, *p* = 0.14; Priorly trained: t_{12} = 0.87, *p* = 0.40). No difference was observed between the two groups (unpaired *t*-test, t_{24} = 0.43, *p* = 0.67) (**C**) Novel box exposure after encoding did not lead to above-chance performance in both groups (No prior training: one-sample *t*-test, t_{12} = 1.59, *p* = 0.14; Priorly trained, t_{12} = 0.05, *p* = 0.96). No difference was observed between the two groups (unpaired *t*-test, t_{24} = 0.73, *p* = 0.48). (**D**) Exploration in the encoded zone after encoding increased the percentage of correct digging in priorly trained group only (No prior training: one-sample *t*-test vs. chance, t_{12} = 0.47, *p* = 0.65; Priorly trained: one-sample *t*-test vs. chance, t_{12} = 2.76, *p* = 0.017). A significant difference was observed between groups (unpaired *t*-test, t_{24} = 2.37, *p* = 0.03). (**E**) With a second strong encoding trial, the percentage of correct digging was significantly above chance in both groups (No prior training: one-sample *t*-test, t_{12} = 3.31, *p* = 0.006; Priorly trained: t_{12} = 2.74, *p* = 0.02). No significant group difference was observed (unpaired *t*-test, t_{24} = 0.65, *p* = 0.52) Data are presented as mean ± SD. ^{*}*p* < 0.05, ^{**}*p* < 0.01.