http://www.newsweek.com/brain-heartbeat-neuroimaging-phase-based-amplified-mri-948822

Every second or so, your heartbeat sends blood surging through the vessels of your body. The impact of this can be felt throughout the body—in the wrists, the neck and the ankles. If you're somewhere quiet, you might even hear your own heartbeat as its vibrations hit your ears. What you probably won't detect is the subtle pulsing of your brain as blood and spinal fluid ebb and flow inside your skull.

Now, scientists have captured and magnified the effect of the heartbeat on the brain in real time. Using a new imaging technique the researchers can watch the brain bounce and warp as blood moves around the body.