When a video of someone speaking is paused, the stationary image of the speaker typically appears less flattering than the video, which contained motion. We call this the frozen face effect (FFE).

视频中某人正在说话的画面被暂停时，静止画面中的人通常都没有视频播放时动态画面中的人好看。这种现象就叫做“冻脸效应”（FFE）。

While researchers aren’t completely certain, one possibility is that, evolutionarily, we’re more accustomed to seeing dynamic faces than static ones. Since it’s easier for our brains to recognize a moving face, and since it requires less work, the result could mean a higher perceived attractiveness.

研究人员也不是很确定形成这一现象的原因，不过有一种可能的解释是，人类在进化过程中已经习惯了接收动态的脸部画面。因为大脑更容易识别动态的脸部画面，这一识别过程也不需要费太多精力，所以接收到的动态脸部画面的魅力指数也就要高一些。