There are certain-- you can take a rat and put an electrode in his brain.

有某种…,可以在老鼠脑子里装一个电极。

耶鲁公开课 - 死亡课程节选

In Neurobiology last year, we were told of a rat who was tested a particular center in the brain where the rat was able to stimulate his brain and caused itself intense pleasure repeatedly.

上学年的生物神经学课提到个实验,老鼠的大脑有一特定区域,让老鼠自行刺激这一区域,从而不断获得强烈的快感。

耶鲁公开课 - 公正课程节选