The Pumping Movements (IMAGE) Hokkaido University Caption Computer simulation of rhythmic "pumping" movement in the green brittle star with five arms (top) and six arms (bottom) based on a phenomenological model. It proves pumping can be coordinated by internal body fluid alone, without neural activity. Credit Wakita D. et al., Scientific Reports. June 5, 2019 Usage Restrictions This image is copyrighted and can be used for reporting this research work without obtaining a permission if credited properly. 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.