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Studies of object-recognition memory in lab rats began in the late 1980s, using variants of the trial-unique delayed nonmatching-to-sample (DNMS) task. By the end of the 20th century, most investigators who wanted to study object-recognition in rodents had abandoned the DNMS task in favor of the novel-object-preference (NOP) test, mainly because the latter test is relatively easy to employ, whereas...
Rationale. Nitric oxide (NO) is sought to be a novel intracellular messenger in the central nervous system. Recently, NO involvement in learning and memory processes has been proposed. Compounds that inhibit NO synthase, the key synthesizing enzyme, may block cognition, while NO donors may facilitate it. Objectives. The present study was designed to further investigate in the rat the effects on distinct...
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