英语时差：为什么闭着眼睛很难单脚站立（下）

These motion-detectors are not sensitive enough, though, to register movement unless it is of a fairly significant sort. You wouldn’t want to get dizzy every time you turn your head! We rely to a significant degree on our eyes for more fine-tuning of our balance. If you think about it, this makes sense. By sensing the pull of gravity or your head’s motion, your ears tell you where you are. But your eyes add to that information as well, just by looking. Think of how a fast-paced movie makes you dizzy, just by watching it. One thing some people find helps them with their eyes closed is the after-image of a bright light. Even the sensation that you are looking at something can make you feel less in danger of falling over.