Hippocampus Brain (IMAGE) Johns Hopkins University Caption This is a cross-section of a rat's brain, showing where the key decisions are made about what is a new memory being made and what is old and familiar. Credit Johns Hopkins University 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.