So what actually happens when we feel disgusted? There are different elements of the response that are psychologically bound together, and they all tend to happen when you feel disgusted by something. The one that's probably the most recognizable is what I call the "yuck face" -- your nose and brow wrinkles and you might stick out your tongue -- which mimics the facial movements that precede actual retching. When you're disgusted, you make that face to signal what you're feeling to other people. But because disgust is an emotion, it's not purely cognitive or psychological. There are physiological elements that accompany it, too. Unlike other emotions, like fear and anger, which make your heartbeat speed up, disgust makes your heartbeat slow down a bit. There is also a little flash of nausea or the sense of something being wrong with your stomach. This happens because the aversion that's produced with disgust uses a lot of the same physiological elements that make up the digestive system.