Gaping Rat (IMAGE) University of Guelph Caption This is an image of a rat displaying the disgust reaction called "gaping." This reaction is helping researchers understand brain mechanisms that produce nausea in humans. Credit University of Guelph Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.