What we have in common? (IMAGE) Kyoto University Caption An experiment nearly 40 years ago in frogs showed that their leg muscles were controlled by simultaneously recruitment of two modules of neurons. It's a bit more complex in macaques. Credit The National Center of Neurology and Psychiatry Usage Restrictions Credit accordingly 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.