Swimmer Ariana Kukors presses her fingers into a device built to measure the force she generates with her freestyle kick. (She doesn’t hold on to anything.) The red vertical line shows the amount of force at a point in time. Kukors’s kick is strong and consistent, which is why the wave signal generally has the same amplitude throughout the recording.
This animation was generated from a normal human subject. It shows only the fibers that originate in a particular cross section of the brain. The blue arc in the middle of the brain is part of the cingulum bundle. Radiologists at Massachusetts General Hospital are beginning to use this method to examine their patients’ brain: it provides a quick way to scan through the entire set of data for abnormalities.