The ability to borrow or share states of mind, once historically and culturally assumed, is now pathologized, as Teresa Brennan shows in relation to affective transfer in psychiatric clinics and the prevalence of psychogenic illness in contemporary life. To neglect the mechanism by which affect is transmitted, the author claims, has serious consequences for science and medical research.
Brennan?s theory of affect is based on constant communication between individuals and their physical and social environments. Her important book details the relationships among affect, energy, and "new maladies of the soul," including attention deficit disorder, chronic fatigue syndrome, codependency, and fibromyalgia.