Association learning during suckling was investigated. Five-day-old rats equipped with tongue cannulae placed either 2 mm rostral or 4-6 mm caudal to the intermolar eminence received sweet or salty solutions while suckling. This ingestion was followed by lithium chloride toxicosis. Pups with anterior cannulae took in considerably less fluid than control pups when tested 5 or 16 days later. A series of control groups demonstrated that this acquired aversion was associative in nature. Pups with posterior cannulae did not form the association. The failure of 5-day-old rats with posterior cannulae to form associations while suckling is not due to the prevention of conditioning by the act of suckling per se. Rather, the failure rests in the fluid's not reaching anterior taste receptors when injected into the posterior oropharynx, where the nipple normally empties its contents. These findings are discussed in terms of the transfer of information obtained during suckling prior to weaning, to feeding and drinking during and after weaning.

译文

研究了哺乳过程中的关联学习。五天大的老鼠在哺乳时,将舌管置于2毫米的鼻孔或4 6毫米的尾部,以获得甜或咸的溶液。摄入后发生氯化锂中毒。在5或16天后进行测试时,带有前套管的幼崽吸收的液体比对照幼崽少得多。一系列对照组表明,这种获得性厌恶本质上是关联的。带有后套管的幼崽没有形成关联。5天大的大鼠在哺乳过程中无法形成关联,这并不是由于哺乳行为本身对调理的预防。相反,失败在于将液体注射到后口咽部时未到达前味觉感受器,乳头通常会排空其内容物。这些发现是根据断奶前哺乳过程中获得的信息的转移,断奶期间和断奶后的喂养和饮酒来讨论的。

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