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

What this does then is it paralyzes you because your motor neurons-- You send the command to your arm to stand, to lift up.

结果就是它能使你瘫痪,因为你的运动神经元,你想要举起手臂

耶鲁公开课 - 心理学导论课程节选