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Antagonism of opioid receptors following odor–shock conditioning in neonates yields consolidation of an odor aversion instead of the age-typical preference. Bars represent the number of choices (mean ± SEM) toward peppermint during Y-maze testing for pups that received paired presentations of odor and shock (SAL, n = 8; NTX, n = 7) or control presentations (SAL, n = 8; NTX, n = 7). SAL indicates saline; NTX, naltrexone. *P < 0.05.
