Mormyrids (IMAGE) Washington University in St. Louis Caption African fish called mormyrids communicate using pulses of electricity. New research from biologists at Washington University in St. Louis shows that a time-shifted signal in the brain helps the fish to ignore their own pulse. This skill has co-evolved with large and rapid changes in these signals across species. Credit Matasaburo Fukutomi/Tsunehiko Kohashi Usage Restrictions For editorial purposes 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.