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Let's start with a game.
我们从一个游戏开始。
Quick, find a seat and stick your right foot out slightly.
快，找个座位，把右脚伸出来。
Start to turn it in a clockwise motion.
开始顺时针转动它。
Now take your right index finger and try to draw the number six from the top down.
现在用你的右手食指，试着从上往下写一个数字6。
Whoops. What happened?
哎呦。出现了什么情况？
Did your foot suddenly stop or change direction?
你的脚是否突然停了下来或改变了方向？
No matter how hard you try, you probably can't do it.
不管你怎么努力，你可能都做不到。
The reason is because the left hemisphere of your brain controls the right side of your body.
原因是你大脑的左半球控制着你身体的右侧。
And your brain's motor cortex gives instructions to only one side of your body at the same time.
在同一时间，大脑的运动皮层只能向身体的一侧发出指令。
Give different directions to your right arm and your right leg, and you'll get the wrong results.
而让你的右臂和右腿向不同的方向运动，你就会得到错误的结果。
