Uncovering the Sound of 'Motherese' (IMAGE) Princeton University Caption A mother plays with her baby in the Princeton Baby Lab, where researchers have identified consistent shifts in vocal timbre between mothers speaking or reading to their children and speaking to other adults. Credit Sameer A. Khan/Fotobuddy Usage Restrictions Editorial use only 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.