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。

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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。

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