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William James said near the end of the nineteenth century, “No mental modification ever occurs which is not accompanied or followed by a bodily change.” A hundred years later, Norman Cousins summarized the modern view of mind-body interactions with the succinct phrase “Belief becomes biology.”6 That is, an external suggestion can become an internal expectation, and that internal expectation can manifest in the physical body. While the general idea of mind-body connections is now widely accepted, forty years ago it was considered dangerously heretical nonsense. The change in opinion came about largely because of hundreds of studies of the placebo effect, psychosomatic illness, psychoneuroimmunology, and the spontaneous remission of serious disease.7 In studies of drug tests and disease treatments, the placebo response has been estimated to account for between 20 to 40 percent of positive responses. The implication is that the body’s hard, physical reality can be significantly modified by the more evanescent reality of the mind.8 Evidence supporting this implication can be found in many domains. For example: • Hypnotherapy has been used successfully to treat intractable cases of breast cancer pain, migraine headache, arthritis, hypertension, warts, epilepsy, neurodermatitis, and many other physical conditions.9 People’s expectations about drinking can be more potent predictors of behavior than the pharmacological impact of alcohol.10 If they think they are drinking alcohol and expect to get drunk, they will in fact get drunk even if they drink a placebo. Fighter pilots are treated specially to give them the sense that they truly have the “right stuff.” They receive the best training, the best weapons systems, the best perquisites, and the best aircraft. One consequence is that, unlike other soldiers, they rarely suffer from nervous breakdowns or post-traumatic stress syndrome even after many episodes of deadly combat.11 Studies of how doctors and nurses interact with patients in hospitals indicate that health-care teams may speed death in a patient by simply diagnosing a terminal illness and then letting the patient know.12 People who believe that they are engaged in biofeedback training are more likely to report peak experiences than people who are not led to believe this.13 Different personalities within a given individual can display distinctly different physiological states, including measurable differences in autonomic-nervous-system functioning, visual acuity, spontaneous brain waves, and brainware-evoked potentials.14 While the idea that the mind can affect the physical body is becoming more acceptable, it is also true that the mechanisms underlying this link are still a complete mystery. Besides not understanding the biochemical and neural correlates of “mental intention,” we have almost no idea about the limits of mental influence. In particular, if the mind interacts not only with its own body but also with distant physical systems, as we’ve seen in the previous chapter, then there should be evidence for what we will call “distant mental interactions” with living organisms.
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