The human face is the first surveillance technology, the original screen and readout of danger. When a suspicious blur crosses our visual field, eyebrows shoot up and pull in, upper eyelids lift as high as they can, nostrils flare, lips tighten, and the jaw may drop. Heat maps show blood flowing away from pallid cheeks and toward the eye muscles. Neurologist Duchenne de Boulogne, who practiced before the invention of anesthesia, described a patient awaiting surgery whose "eyeball seemed to be chased from its orbit." Unlike anywhere else in the body, muscles on the face are attached directly to the skin, and their movements are easily detected. Biological signals tend toward exaggeration. A fleeing deer will lift its tail to flash an almost foot-long patch of white, signaling others to beat a hasty retreat. Humans unveil big sclera, or whites of the eyes, and a clear view of where the eye is pointing.
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机译：人脸是第一种监视技术，原始屏幕和危险读数。当可疑的模糊效果越过我们的视野时，眉毛会向上伸出并拉入，上眼睑会尽可能地抬高，鼻孔张开，嘴唇紧绷，下巴可能会掉落。热图显示血液从苍白的脸颊流向眼部肌肉。神经学家杜兴·德·布洛涅（Duchenne de Boulogne）在麻醉发明之前就曾实践过，他描述了一名正在等待手术的患者，他的“眼球似乎被从眼眶中赶走了”。与身体其他任何地方不同，面部肌肉直接附着在皮肤上，其运动很容易检测到。生物信号趋于夸大。一只逃离的鹿将抬起尾巴，闪出几乎一英尺长的白色斑块，这标志着其他人击败了匆忙的撤退。人类会露出大的巩膜或眼睛的白色，并清楚地看到眼睛的指向。
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