Illustration of Synapses (IMAGE) University of Zurich Caption The size of synapses in the cerebral cortex directly determines the strength of their signal transmission - illustrated as three nerve cell connections of different size and brightness. Credit Kristian Herrera and authors 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.