The course of a metastasizing cancer is unlikely to be changed by how we talk about it. With schizophrenia, however, symptoms are inevitably entangled in a person’s complex interactions with those around him or her. In fact, researchers have long documented how certain emotional reactions from family members correlate with higher relapse rates for people who have a diagnosis of schizophrenia. Collectively referred to as “high expressed emotion,” these reactions include criticism, hostility and emotional overinvolvement (like overprotectiveness or constant intrusiveness in the patient’s life). In one study, 67 percent of white American families with a schizophrenic family member were rated as “high EE.” (Among British families, 48 percent were high EE; among Mexican families the figure was 41 percent and for Indian families 23 percent.)

Does this high level of “expressed emotion” in the United States mean that we lack sympathy or the desire to care for our mentally ill? Quite the opposite. Relatives who were “high EE” were simply expressing a particularly American view of the self. They tended to believe that individuals are the captains of their own destiny and should be able to overcome their problems by force of personal will. Their critical comments to the mentally ill person didn’t mean that these family members were cruel or uncaring; they were simply applying the same assumptions about human nature that they applied to themselves. They were reflecting an “approach to the world that is active, resourceful and that emphasizes personal accountability,” Prof. Jill M. Hooley of Harvard University concluded. “Far from high criticism reflecting something negative about the family members of patients with schizophrenia, high criticism (and hence high EE) was associated with a characteristic that is widely regarded as positive.”

Widely regarded as positive, that is, in the United States. Many traditional cultures regard the self in different terms — as inseparable from your role in your kinship group, intertwined with the story of your ancestry and permeable to the spirit world. What McGruder found in Zanzibar was that families often drew strength from this more connected and less isolating idea of human nature. Their ability to maintain a low level of expressed emotion relied on these beliefs. And that level of expressed emotion in turn may be key to improving the fortunes of the schizophrenia sufferer.

Of course, to the extent that our modern psychopharmacological drugs can relieve suffering, they should not be denied to the rest of the world. The problem is that our biomedical advances are hard to separate from our particular cultural beliefs. It is difficult to distinguish, for example, the biomedical conception of schizophrenia — the idea that the disease exists within the biochemistry of the brain — from the more inchoate Western assumption that the self resides there as well. “Mental illness is feared and has such a stigma because it represents a reversal of what Western humans . . . have come to value as the essence of human nature,” McGruder concludes. “Because our culture so highly values . . . an illusion of self-control and control of circumstance, we become abject when contemplating mentation that seems more changeable, less restrained and less controllable, more open to outside influence, than we imagine our own to be.”

CROSS-CULTURAL psychiatrists have pointed out that the mental-health ideas we export to the world are rarely unadulterated scientific facts and never culturally neutral. “Western mental-health discourse introduces core components of Western culture, including a theory of human nature, a definition of personhood, a sense of time and memory and a source of moral authority. None of this is universal,” Derek Summerfield of the Institute of Psychiatry in London observes. He has also written: “The problem is the overall thrust that comes from being at the heart of the one globalizing culture. It is as if one version of human nature is being presented as definitive, and one set of ideas about pain and suffering. . . . There is no one definitive psychology.”

Behind the promotion of Western ideas of mental health and healing lie a variety of cultural assumptions about human nature. Westerners share, for instance, evolving beliefs about what type of life event is likely to make one psychologically traumatized, and we agree that venting emotions by talking is more healthy than stoic silence. We’ve come to agree that the human mind is rather fragile and that it is best to consider many emotional experiences and mental states as illnesses that require professional intervention. (The National Institute of Mental Health reports that a quarter of Americans have diagnosable mental illnesses each year.) The ideas we export often have at their heart a particularly American brand of hyperintrospection — a penchant for “psychologizing” daily existence. These ideas remain deeply influenced by the Cartesian split between the mind and the body, the Freudian duality between the conscious and unconscious, as well as the many self-help philosophies and schools of therapy that have encouraged Americans to separate the health of the individual from the health of the group. These Western ideas of the mind are proving as seductive to the rest of the world as fast food and rap music, and we are spreading them with speed and vigor.

No one would suggest that we withhold our medical advances from other countries, but it’s perhaps past time to admit that even our most remarkable scientific leaps in understanding the brain haven’t yet created the sorts of cultural stories from which humans take comfort and meaning. When these scientific advances are translated into popular belief and cultural stories, they are often stripped of the complexity of the science and become comically insubstantial narratives. Take for instance this Web site text advertising the antidepressant Paxil: “Just as a cake recipe requires you to use flour, sugar and baking powder in the right amounts, your brain needs a fine chemical balance in order to perform at its best.” The Western mind, endlessly analyzed by generations of theorists and researchers, has now been reduced to a batter of chemicals we carry around in the mixing bowl of our skulls.