Schematic time line of the procedure for the acquisition and retrieval of object location memory (OLM). The data show the effect of contextual novelty after weak encoding on short-term memory (STM) and long-term memory (LTM) sessions. In the training session, young adult rats were allowed to freely explore the sample objects (A and B) for 5 min (weak training [WT]), and the mean discrimination index (DI) and recognition index (RI) of the sample objects were evaluated in independent cohort of rats subjected to STM or LTM. The DI (A,C) and RI (B,D) of the moved and sample objects were evaluated for the 5 min in the object location memory testing (OLM) on STM (A,B) and on LTM (C,D) in rats of the WT groups or in rats subjected to contextual novelty 30 min after weak training (WT + novelty; n = 8 per group/time probe test). All individual values are shown. The values are presented as the means (±SEMs). Lines represent the chance value for the DI (0.0) and RI (0.5). Comparison of ratio discriminations from the group above chance level used one-sample t-tests. Intragroup comparisons (testing vs. training sessions) used a paired t-test.
