Richard Hammerschlag: This discussion will be among the participants of a symposium on clinical and basic science research on the biofield, held as part of the International Research Congress on Integrative Medicine and Health in Portland, Oregon in May 2012. The 7 of us are conventional biomedical researchers in physiology, clinical psychology, cell biology, biophysics, and neurobiology, who through various paths have expanded our research interests to include performing preclinical studies, clinical trials, and systematic reviews of biofield therapies, as well as basic research and reviews on what we call biofield physiology. We should begin with a few definitions. Biofield therapies, which most commonly include external Qigong, Healing Touch, Johrei, Reconnective Healing, Reiki, and Therapeutic Touch, are a family of health care practices that involve either, or both, hands-on and hands-off treatment. 1,2 We infer that such healing can occur since living systems coexist within and co-contribute to a biofield, 3,4 which we define in terms of electric, magnetic, and electromagnetic fields as well as subtle energies (energies that appear to exist but have not yet been measured). I'd like to ask Jim to provide us with a brief overview of how the concept of the biofield has evolved.