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 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.