An actor was trained to pull one of two chains to receive its food in response to a brief flash of blue or red light.

一个表演者被训练对一道闪过的蓝色或红色的光做出反应，拉动两条链条中一条以得到食物。

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An actor was trained to pull one of two chains to receive its food in response to a brief flash of blue or red light.

一个表演者被训练对一道闪过的蓝色或红色的光做出反应，拉动两条链条中一条以得到食物。

youdao