Scents have power over memory (IMAGE) Boston University Caption Engaging hippocampal engrams across time. Granule cells in the mouse hippocampus (shown in blue) that were active during the formation of a discrete memory were selectively targeted to express activity-dependent DREADDs (shown in green; designer receptors exclusively activated by designer drugs). These hippocampal cells were traditionally thought to be more active shortly after memory formation (e.g., one day later) and less so when accessed at more remote time points (e.g. 21 days later). Here we show that when salient memories are imbued with highly contextual information such as an odor, this process of systems consolidation is delayed, as they continue to rely on the hippocampus for processing Credit Dr. Stephanie Grella (Ramirez Lab) Usage Restrictions Must credit 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.