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We investigated the effect of a post-training chronic infusion of N-methyl-D-aspartate (NMDA) receptor blocker on retention of spatial reference memory in rats. In Experiment 1, we trained 4 groups of rats for 4 days (4 trials/ day) in the Morris water maze task. In a single probe trial after retention intervals of 1, 7, 14, and 28 days, the 1-day group showed more goal crossings than shown by the other 3 groups. In Experiment 2, a chronic infusion of the NMDA receptor antagonist D-2-amino-5-phosphonovaleric acid (D-AP5) or a control vehicle into the lateral ventricle was initiated 1 day after the training session, and continued for 6 days. In the subsequent probe trial (7 days after training), the rats that had received the D-AP5 infusion showed significantly more goal crossings than the controls. These findings suggest that an NMDA receptor blockade following acquisition facilitates retention of spatial reference memory.

Post-training N-methyl-D-aspartate receptor blockade facilitates retention of acquired spatial memory in rats