Optogenetics (IMAGE) Brown University Caption Using pulses of blue light in a type of brain cell in the sensory neocortex generated a gamma rhythm that made mice more touch sensitive. Credit Micheal Cohea/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.