When blood flow increases above some predetermined threshold, a tone will sound. The client is instructed to decrease blood flow in the hand. People are able to learn this control, although the mechanism is unclear as to how this works. It was recognized that psychological factors are important in the etiology and maintenance of these disorders. An individual's health must be understood in the context of a system.
Illness is potentially a quite complex experience.
Biological processes per se. The role of biological and psychological processes as part of a single system. The effect of interpersonal relationships on health. Likewise, intervention will address these various levels. It is clear from this perspective that in many cases physical health and psychological processes can not be separated.