Action Potentials (IMAGE) Max-Planck-Gesellschaft Caption Individual and double action potentials can be recorded optically using a genetic calcium indicator that colors the cells in the brain of a living mouse. Credit Image: Max Planck Institute for Medical Research Usage Restrictions None 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.