Kindergartners (IMAGE) Michigan State University Caption Some children enter preschool able to control their behavior and ready to learn, but others don't develop self-control until they get to kindergarten -- or even later. Credit Michigan State University 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.