In his well-known book The Holographic Universe theoretical physicist Michael Talbot discusses the work of Valerie Hunt on energy fields. He writes: "Over the past twenty years Valerie Hunt, a physical therapist and professor of kinesiology at UCLA, has developed a way to confirm experimentally the existence of the human energy field. Medical science has long known that humans are electromagnetic beings. Doctors routinely use electrocardiographs to make electrocardiograms (EKGs), records of the electrical activity of the heart, and electroencephalographs to make electroencelophalograms (EEGs) of the human brain's electrical activity. Hunt discovered that an electromyograph, a device used to measure the electrical activity in the muscles, can also pick up the electrical presence of the human energy field." From this, Hunt came up with the idea to make electromyograms (EMGs) of people's energy fields. Hunt confirmed the existence of the energy fields with this apparatus. Talbot goes on to describe more of Hunt's findings with respect to energy frequencies found among different people. One example supports the hypothesis that thinking primarily about topics from the mundane world specifically lowers one's energy. He writes: "One of Hunt's most startling findings is that certain talents and abilities seem to be related to the presence of specific frequencies in a person's energy field. She has found that when the main focus of a person's consciousness is on the material world, the frequencies of their energy field tend to be in the lower range and are not too far removed from the 250 cps [-cycles per second] of the body's biological frequencies. In addition to these, people who are psychic or who have healing abilities also have frequencies of roughly 400 to 800 cps in their field." In this way, mind intent and topics of thought are shown to be intrinsically linked to one's energy and thus one's level. People with lower level supernormal abilities are said here to have frequencies between 400-800 cps. However, higher level folks have an even higher frequency, as Talbot relates: "People who have frequencies above 900 cps are what Hunt calls mystical personalities." "Using a modified electromyogram (an electromyogram can normally only detect frequencies up to 20,000 cps), Hunt has encountered individuals who have frequencies as high as 200,000 cps in their energy fields."