Children (IMAGE) Universitat Pompeu Fabra - Barcelona Caption A study that reveals for the first time that children aged 3 use gestural and prosodic precursors when expressing uncertainty, which they will express after the age of 5 through lexical cues. Credit UPF 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.