Spinal Cord Sensor (IMAGE) Purdue University Caption An implantable sensor has the speed and precision for tracking a brain chemical known to be elevated in certain brain diseases and after a spinal cord injury. Credit Purdue University image/Tran Nguyen 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.