Human Language (IMAGE) University of Barcelona Caption These research studies claim that it is more likely that language evolved gradually, instead of by means of sudden single mutation. Credit Cedric Boeckx (University of Barcelona- ICREA-UBICS) Usage Restrictions The image may only be used with appropriate caption or 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.