Bentov was fascinated by
consciousness, in particular how it related to physiology. In his 1977 book,
Stalking the Wild Pendulum: On the Mechanics of Consciousness, he wrote that "consciousness permeates everything". Bentov's invention was a seismographic device to record the heartbeat, in particular the aorta's reverberations.
Marc Seifer described the results: "During normal breathing, the reverberations in the aorta are out of phase with the heartbeat and the system is inharmonious. However, during meditation and when the breath is held, the echo off the bifurcation of the aorta (where the aorta forks at the pelvis to go into each leg) is in resonance with the heartbeat and the system becomes synchronized, thus utilizing a minimum amount of energy. This resonant beat is approximately seven cycles per second, which corresponds not only to the alpha rhythm of the brain but also to the low-level magnetic pulsations of the Earth." ==Personal life==