Diffusion Spectrum Image of Human Brain (IMAGE) NIH/National Institute of Mental Health Caption This diffusion spectrum image shows brain wiring in a healthy human adult. The thread-like structures are nerve bundles, each containing hundreds of thousands of nerve fibers. Credit Van J. Wedeen, M.D., MGH/Harvard University 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.