Visual-Cortex (IMAGE) Max-Planck-Gesellschaft Caption Even when neurons in the visual cortex are cut off from their main source of information, within 48 hours their activity returns to a level similar to that prior to the disruption. Under the microscope the currently active cells light up thanks to the addition of a calcium indicator. Credit Credit: MPI of Neurobiology/Hübener 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.