Delayed Gratification (2 of 2) (video) University of Rochester Loading video... Caption For the past four decades, the "marshmallow test" has served as a classic experimental measure of children's self-control: will a preschooler eat one of the fluffy white confections now or hold out for two later? Now a new study demonstrates that being able to delay gratification is influenced as much by the environment as by innate ability. Credit Matthew Mann/University of Rochester Usage Restrictions None 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.