When a person swallows, squeezing pressure is created to drive food and liquid down the throat to the esophagus (food tube). If a person has a swallowing impairment, meaning it is hard for him/her to swallow, he/she may need to use more squeezing pressure to drive the food or liquid down the throat to the esophagus. For this study, we want to examine the effect of making it harder to swallow (by placing a device around your neck that applies pressure to your neck) on how much squeezing pressure is needed to swallow liquids in normal people. After numbing the inside of your nose with numbing cream, we will use two instruments at the same time to measure this: 1) a small scope placed through your nose into the upper part of your throat, so that a camera can record the movements of your throat before and after swallowing and 2) a small catheter placed through your nose and fed into your stomach while you swallow, which records the squeezing pressures of the muscles in your throat and esophagus. We also want to see how much liquid remains in the throat after swallowing and how well the windpipe is protected from liquid entering it before, during, and after swallowing.