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. 2022 May 3;12:7199. doi: 10.1038/s41598-022-10453-z

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© The Author(s) 2022

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Postnatal changes in other hippocampus-dependent tasks. (A) Contextual freezing across training (gray) and testing periods (black). Exposure to context significantly increased averaged freezing time at 3–8 weeks. (B) Exploration of familiar (gray) and novel objects (black) in object recognition task. Training increased the touch time of the novel object at 3–8 weeks. (C) Exploration of unchanged (gray) and exchanged objects (black) in novel object placement task. Training also increased the touch time of the exchanged objects at 8 weeks. (D) Total touch time of familiar (gray) and stranger (black) in social recognition task. Training increased the touch time of the novel target at 3–8 weeks. (E) The alternation ratio in the Y-maze test was higher at 8 weeks than it was at 2 weeks. (F) Number of total arm entries in the maze. The number of rats is shown at the bottom of each bar. Data are shown as individual points and are the mean ± SEM. *P < 0.05, **P < 0.01.