Return-Point Memory (IMAGE) Penn State Caption Return-point memory relies on the alternating of direction of the external force, or “driving,” much like a combination lock relies on the dial being turned both clockwise and counterclockwise. The mathematical theorems for return-point memory suggest that materials cannot store a sequence of previous deformations if the driving is only in one direction, or asymmetrical. However, a team of researchers found the exact conditions under which this this type of material memory is possible. Credit Nathan Keim/Penn State Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.