Optrode (IMAGE) Brown University Caption This hair-thin combination of electrode and optical fiber allows researchers to deliver stimulating light and current to a neuron and to measure the electrical activity of each. Credit Sheinberg Lab/Brown University Usage Restrictions with credit 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.