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Spatial cognition appears to be compromised in elderly and in patients suffering from dementia. These deficits are believed to be modelled, at least partly, by the administration of scopolamine or MK-801 in normal adult animals. In order to establish an animal model suited for the evaluation of putative cognition enhancers, we assessed the effects of scopolamine (0.3, 0.5, 0.7 mg kg −1 , i...