A Photo of the Potential Engram (IMAGE) Institute of Science and Technology Austria Caption Without activity, only few vesicles are found at the synapse. After a short burst of activity, vesicles dock at the synapse. The pool of vesicles is stored at the synapse even minutes later. This pool may be the physical trace of memory, the 'engram'. Credit © Jonas Group / IST Austria Usage Restrictions © Jonas Group / IST Austria 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.