Rather, what determines the size in the brain is the extent to which either they have motor command over it or sensory control.

相反,对运动的控制程度,或是对感觉的控制程度,决定了身体部位在大脑中对应区域的大小

耶鲁公开课 - 心理学导论课程节选

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.

而且你会发现,身体部位在大脑中对应的皮层面积大小,与身体部位的实际大小并不一致

耶鲁公开课 - 心理学导论课程节选