伤口愈合的第一个阶段，受损区域的炎症反应刺激一种叫做胶原蛋白的物质生成。

During the first stage of wound healing, inflammation around the damaged area stimulates the production of a substance called collagen.

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洛杉矶加州大学神经外科医生伊查克·弗莱德在其发表在《自然》杂志的论文中，就介绍过这么一个例子：弗莱德当时正在研究一名16岁癫痫少女的大脑，以寻找刺激其癫痫发作的发作根源，结果却发现了一个奇怪的现象：只要他给病人的左前叶（说到底就是一个不足1平方英寸的区域）施加电流，那个女孩就会笑出声来。

Take the case of a 16-year-old girl described four years ago in Nature by neurosurgeon Itzhak Fried of the University of California at Los Angeles.

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这个区域应该用一个或两个指头来刺激，动作就像是“过来”的手势。

This area should be stimulated with one or two fingers making a "come here" motion.

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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。

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