Last year, a group of researchers from MIT's Computer Science and Artificial Intelligence Lab (CSAIL) showed us just how easy it is to "see" the heartbeat in ordinary video footage. With a little filtering, a little averaging, and a touch of turn-of-the-century (1900) mathematical analysis, the telltale color changes in the skin associated with the peak pressure pulse of the heart can be seen by anyone. The CSAIL researchers have now rejiggled their algorithms to optimize instead for detection of the subtle head motions that are associated with each beat.