【耶鲁公开课：心理学导论】Lesson 2 这是你的大脑(39)

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So, your tongue is closer to your jaw than it is to your hip in the body; so too in both the motor cortex and the somatosensory cortex. Also, you'll notice that the size of the body part represented in the brain does not correspond to the size of the body part in the real world. Rather, what determines the size in the brain is the extent to which either they have motor command over it or sensory control. So, there's a whole lot of sensory organs, for instance, focused along your tongue, and that's why that's so big, and an enormous amount on your face but your shoulder isn't even - doesn't even make it on there because, although your shoulder might be bigger than your tongue, there's not much going on. In fact, if you draw a diagram of a person, what their body is corresponding to the amount of somatosensory cortex, you get something like that. That's your sensory body.