You might say, well what's the person who studied chemical metallurgy doing teaching chemistry here? Well, after my Ph.D., MIT I came here as a postdoctoral fellow in 1977.
你们可能会问,这个学习,化学冶金学的人怎么会在这教,化学呢,好吧,在我拿到博士学位后,1977年我作为一名博士后来到了。
And, in fact, once you teach an animal something, if you stop doing the teaching the response goes away and this is known as extinction.
事实上,条件反射形成以后,如果得不到强化,条件反应就会逐渐消失,这就是消退。
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