This study aim to examine the hypothesis that repetitive painful stimuli during infancy will alter pain sensitivity and impair learning and memory during adulthood and that saccharin will prevent this through its analgesic effect. Naltrexone is used to examine if saccharin effect is mediated via the endogenous opioid system. Pain in rat pups was induced via needle pricks of the paws on day 1 of their birth (P0).
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