Changes in Total Hemoglobin in the Brain (video) Columbia University School of Engineering and Applied Science Share Print E-Mail Loading video... Caption Real-time movie of changes in total hemoglobin in the brain during stimulation. The initial blush of the brain is followed quickly by dilation (red) of arteries on the brain's surface. Credit Columbia Engineering Usage Restrictions None 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.