you might think that treatments like group therapy after breast cancer would now be standard. Guess again. Affiliation is not a drug or an operation, and that makes it nearly invisible to Western medicine. Our doctors are not uninformed; on the contrary, most have read these studies and grant them a grudging intellectual acceptance. But they don’t believe in them; they can’t bring themselves to base treatment decisions on a rumored phantom like attachment. The prevailing medical paradigm has no capacity to incorporate the concept that a relationship is a physiologic process, as real and as potent as any pill or surgical procedure.

Loving is limbically distinct from in love. Loving is mutuality ; loving is synchronous attunement and modulation. As such, adult love depends critically upon knowing the other. In love demands only the brief acquaintance necessary to establish an emotional genre but does not demand that the book of the beloved’s soul be perused from preface to epilogue. Loving derives from intimacy, the prolonged and detailed surveillance of a foreign soul.

The emotional mind likewise transcends the facile and appealing dualism separating its psychological and biological aspects. Physical mechanisms produce one’s experience of the world. Experience, in turn, remodels the neurons whose chemoelectric messages create consciousness. Selecting one strand of that eternal braid and assigning it primacy is the height of capriciousness.

People rely on intelligence to solve problems, and they are naturally baffled when comprehension proves impotent to effect emotional change. To the neocortical brain, rich in the power of abstractions, understanding makes all the difference, but it doesn’t count for much in the neural systems that evolved before understanding existed. Ideas bounce like so many peas off the sturdy incomprehension of the limbic and reptilian brains. The dogged implicitness of emotional knowledge, its relentless unreasoning force, prevents logic from granting salvation just as it precludes self-help books from helping. The sheer volume and variety of self-help paraphernalia testify at once to the vastness of the appetite they address and their inability to satisfy it.

a mood is a state of enhanced readiness to experience a certain emotion. Where an emotion is a single note, clearly struck, hanging for a moment in the still air, a mood is the extended, nearly inaudible echo that follows. Consciousness registers a fading level of activation in the emotion circuits faintly or not at all. And so the provocative events of the day may leave us with emotional responsiveness waiting beneath our notice. If a man spills coffee on himself, his annoyance is relatively short-lived — on the order of minutes. After the conscious feeling is gone, residual activity in the anger circuits lingers. He will pass into an irritable mood — a quickness to anger, the only reflection of the waning activity in those circuits.

On the other side of the aisle are evolutionary psychologists and cross-cultural sociologists, who point out that the American habit of sleeping separately is a global and historical singularity. Almost all the world’s parents sleep with their children, and until the last sliver of human history, separate sleep was surpassingly rare. The burden of proof thus falls upon our culture to justify its anomalous nighttime practices.

Humanity began in a precarious world where tiny bands foraged and scrimped for food by day, huddled together for warmth by night. With the advent of agriculture came mass aggregation in towns and cities. The industrial revolution took work out of the home, making the populace “a mass of undifferentiated equals, working in a factory or scattered between the factories, the mines, and the offices, bereft forever of the feeling that work was a family affair, done within the household.” Economies prospered as families dissipated. In pursuit of further riches, the information age demands a more thoroughgoing surrender — less time for relationships, less time for children, more time for impersonal everything. Before our lives wither away into dust, we might ponder how much more prosperity human beings can possibly survive.

Proof that expressions are intrinsic is closer at hand than the South Pacific. As Darwin knew, a congenitally blind baby will smile while interacting pleasurably with his mother. Such a smile comes from a developing creature unable to speak, walk, or even sit up, but he already knows how to express happiness through a configuration of muscular contractions he has never seen on anyone’s face.

Recordings of encephalographic electrical waves show, amid their jagged spikes and hieroglyph swirls, a signature downward dip signifying that a neuronal mandate for motion is under way: the so-called readiness wave. While the motor cortex produces motion, the readiness wave appears to signal intent. So we should look here for will.

Limbic pursuits sink slowly and steadily lower on America’s list of collective priorities. Top-ranking items remain the pursuit of wealth, physical beauty, youthful appearance, and the shifting, elusive markers of status. There are brief spasms of pleasure to be had at the end of those pursuits – the razor-thin delight of the latest purchase, the momentary glee of flaunting this promotion or that unnecessary trinket – pleasure here, but not contentment. Happiness is within range only for adroit people who give the slip to America’s values. These rebels will necessarily forgo exalted titles, glamorous friends, exotic vacations, washboard abs, designer everything – all the proud indicators of upward mobility – and in exchange, they may just get a chance at a decent life.

The scientific basis for separating neocortical from limbic brain matter rests on solid neuroanatomical, cellular, and empirical grounds. As viewed through the microscope, limbic areas exhibit a far more primitive cellular organization than their neocortical counterparts. Certain radiographic dyes selectively stain limbic structures, thus painting the molecular dissimilarity between the two brains in clean, vivid strokes. One researcher made an antibody that binds to cells of the hippocampus — a limbic component — and found that those same fluorescent markers stuck to all parts of the limbic brain, lighting it up like a biological Christmas tree, without coloring the neocortex at all. Large doses of some medications destroy limbic tissue while leaving the neocortex unscathed, a sharp-shooting feat enabled by evolutionary divergence in the chemical composition of limbic and neocortical cell membranes.

Will lectures on the evils of chemical dependency deter teenagers from a life of substance dependence? Don’t believe it. While their end is worthy, such talk targets the neocortical brain, not the limbic one. Pain is too potent a motivator for facts to undo. Pretending otherwise is a threadbare illusion convincing only to those who already feel basically well.

Advances in communication technology foster a false fantasy of togetherness by transmitting the impression of contact- phone calls, faxes, e-mail- without its substance. And when a relationship is ailing from frank time deprivation, both parties often aver that nothing can be done. Every activity they spend time on (besides each other) has been classified as indispensable: cleaning the house, catching the news, balancing the checkbook.

A culture wise in love’s ways would understand a relationship’s demand for time. It would teach the difference between in love and loving; it would impart to its members the value of the mutuality on which their lives depend. A culture versed in the workings of emotional life would encourage and promote the activities that sustain health — togetherness with one’s partner and children; homes, families, and communities of connectedness. Such a society would guide its inhabitants to the joy that can be found at the heart of attachment — what Bertrand Russell called “in a mystic miniature, the prefiguring vision of the heaven that saints and poets have imagined.

Modern amorists are sometimes taken aback at the prospect of investing in a relationship with no guarantee of reward. It is precisely that absence, however, that separates gift from shrewdness. Love cannot be extracted, commanded, demanded, or wheedled. It can only be given.