Adult rats learn to be shy away from a taste paired with the ingestion of lactose solution. This study thus aimed to elucidate the nature of this shyness learning. Specifically, by measuring kaolin clay consumption, which is as a good maker of nausea in rats, the study attempted to find out whether lactose produces nausea. Experiment 1 demonstrated that a lactose solution, as well as a lithium chloride sodium chloride cocktail, increased consumption of kaolin clay. Ingestion of a lactose solution increased kaolin consumption in Experiment 2A, while a similarly sweet sucrose solution did not changed it in Experiment 2B. The central results of Experiments 2A and 2B were replicated in Experiment 3 with a modified procedure, suggesting that lactose induces nausea in rats, which yields conditioned aversion (i.e., palatability downshift) of the paired taste.

成年大鼠学会避开与乳糖溶液摄入相配的味道。因此，本研究旨在阐明这种羞怯性学习的本质。具体来说，通过测量高岭土的消耗量，高岭土的消耗量可导致大鼠恶心，该研究试图找出乳糖是否会产生恶心。实验1证明乳糖溶液以及氯化锂氯化钠鸡尾酒混合物增加了高岭土的消耗。在实验2A中，摄入乳糖溶液会增加高岭土的消耗，而在实验2B中，类似甜味的蔗糖溶液却没有改变它的含量。实验2A和2B的主要结果在实验3中以改良的方法重复进行，表明乳糖可引起大鼠恶心，并产生条件性厌恶（即，