Electrode (IMAGE) University of Pittsburgh Caption A laser shining onto an untethered, ultrasmall carbon fiber electrode to stimulate neurons via the photoelectric effect. Credit J. Mater. Chem. B, 2015,3, 4965-4978 - Reproduced by permission of The Royal Society of Chemistry. 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.