Disappearing dendrites (IMAGE) University of Minnesota Caption The researchers found that a higher percentage of synapses disappeared after fear extinction in engram cells, or memory-encoded neurons, as opposed to non-engram cells. Credit Hye Yoon Park, University of Minnesota Usage Restrictions None 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.