【耶鲁公开课：心理学导论】Lesson 2 这是你的大脑(20)

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语气词如Um...这类不用写，有口误重复滴地方就不用写拉╮(╯▽╰)╭
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One interesting thing about neurons is a neuron is like a gun. It either fires or it doesn't. It's all or nothing. If you squeeze the trigger of a gun really hard and really fast, it doesn't fire any faster or harder than if you just squeezed it gently. Now, this seems to be strange. Why? How could neurons be all or nothing when sensation is very graded? If somebody next to you pushed on your hand - the degree of pushing - you'd be able to notice it. It's not either pushing or not pushing. You can - Degrees of pushing, degrees of heat, degrees of brightness. And the answer is, although neurons are all or nothing, there are ways to code intensity. So, one simple way to code intensity is the number of neurons firing; the more neurons the more intense.