Measuring the Motivation for Food with Grip Force (image) The Journal of Visualized Experiments Share Print E-Mail Caption In this grip-force measurement task, a participant's exerted effort is measured while he views rewarding images like food and consumer goods. Credit JoVE Usage Restrictions Credit JoVE. Share Print E-Mail 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.