It's not the case that incongruity causes laughter.

笑声并不是由不一致引起的
If there was a bowl of fruit up there as you walked in, it'd be incongruous

当你走进教室发现这里有一大碗的水果这是不一致的
but people wouldn't shriek with laughter and point to the fruit.

但你们不会对着水果尖声狂笑
It's also--a lot of laughter isn't caused by incongruity

有很多笑声都不是由不一致引起的
so a lot of times when we laugh

我们大部分的笑
there's nothing incongruous in any deep sense about it.

在深层次上没有什么不一致的
So, laughter is kind of a puzzle.

因此笑真是一个不解之谜
We don't know why we laugh. We don't know what makes us laugh.

我们不知道我们为什么笑我们不知道是什么让我们发笑
Over the last five, ten years there's been some work done on this.

过去的五到十年间已经有人做过这方面的研究
A lot of the work is done by Robert Provine

罗伯特·普罗文做过大量的研究
who summarizes this in his excellent book Laughter.

他把结果总结在著作《笑声》中
And Provine decided to do something

普罗文决定做一些