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1·To do this, they subjected animals to conditioned taste aversion training. Taste aversions have evolved in many animals to help them avoid toxic substances.

为了做这个实验，他们使动物产生条件味觉厌恶，在许多动物中这种味觉厌恶使得他们能够回避毒性物质。

2·Objective To investigate the effect of conditioned taste aversion (CTA) acquisition and retention on the expression of endogenous leu-enkephalin (LEK) in rats.

目的观察条件性味觉厌恶学习(CTA)对亮脑啡肽(LEK)表达的影响。