Birth of Agency (IMAGE) Florida Atlantic University Caption When an infant’s foot is tethered to the mobile, each foot movement causes the mobile to move. Positive feedback amplifies and highlights the cause-and-effect relationship between infant and mobile motion. Credit Florida Atlantic University Usage Restrictions Credit: Florida Atlantic University License Original 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.