【英语时差8,16】眼睛快速扫视-上（在线收听）

 Have you ever noticed that you can’t see your eyes move when you look in a mirror? Put your face close to the bathroom mirror and look yourself in the eye. Notice the appearance of your eyes. Now, without blinking, look down at your nose, but continue to notice your eyes. Your eyes look different. They’ve moved, but the movement itself was invisible to you. If you have someone else do the same thing while you watch, you’ll easily see the other person’s eyes move. To make the comparison as fair as possible, you should put your face right next to the other person’s and look at the other person’s nose in the mirror. You’ve just witnessed a mysterious process that shuts off our vision, at least partly, whenever our eyeballs move rapidly. The kind of quick eye motion we’re talking about is called a saccade, from a French word meaning to twitch or jerk.