Mice in confrontation (IMAGE) Princeton University Caption A new study published in the journal Nature found that mice who defended themselves against aggressors learned to be more resilient to aggression, and that the neurotransmitter dopamine plays a role in reinforcing resilience. Credit Danielle Capparella, Princeton University Usage Restrictions Use with credit: Princeton University 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.