Map of Language Development (IMAGE) University of Miami Caption This map shows the distribution of languages with complex tone (red dots) and without complex tone (blue dots) in the Phonotactics Database of the Australian National University. Darker shading on map corresponds to lower mean specific humidity. Credit Caleb Everett / University of Miami Usage Restrictions Use with caption and 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.