Science image (IMAGE) Salk Institute Caption Mice that have formed a social hierarchy get placed in a box where they compete for a food reward. Salk scientists can use brain readouts to accurately predict which animal will win the reward and the social rank of the animal. Credit Salk Institute Usage Restrictions with credit and related coverage. License Original 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.