Rats on the Hunt for Chocolate Help Us Understand the Brain (image) Norwegian University of Science and Technology Share Print E-Mail Caption Marco the rat chasing chocolate bits during a test. Credit Erlend Lånke Solbu/Norwegian Broadcasting Corporation, NRK Usage Restrictions Only in association with articles about this research and with proper credit. Share Print E-Mail 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.