Block Diagram of the Cold Pressor Protocol (image) SPIE--International Society for Optics and Photonics Share Print E-Mail Caption A block diagram illustrates the cold pressor protocol applied in a Drexel University study on functional near-infrared spectroscopy in assessing pain response in the brain; doi:10.1117/1.NPh.4.1.015004. Credit Credit: the authors. Usage Restrictions Use with credit as above. Share Print E-Mail 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.