This love story is about how science is helping us to understand that our body, mind and spirit work together as we interact with those creatures we care about.
The Source of Human Emotions
Because human beings remember with neurons (the cells of nerve tissue), we are disposed to see more of what we have already seen, hear anew what we have heard most often, think just what we have always thought.
Within the brain, every mental activity consists of neutrons (electrically neutral subatomic particles) firing in a certain sequence. An "Attractor" is an association of ingrained links that can overwhelm weaker information patterns. If incoming sensory data provoke a quorum of the Attractor's units, they will trigger their teammates, who flare to brilliant life.
An Attractor can overpower other units so thoroughly that the network registers chiefly the incandescence of the Attractor, even though the fading, firefly traces of another pattern initially glimmered there. A network then registers strikingly new sensory information as if it conformed to past experience. In much the same way, our sun's blinding glare washes countless dimmer stars from the midday sky.
The limbic brain (i.e. the emotional brain) contains its emotional Attractors, encoded early in life. Primal bias then forms an integral part of the neural systems that view the emotional world and conduct relationships. If the early experience of a limbic network exemplifies healthy emotional interaction, its Attractors will serve as reliable guides to the world of workable relationships.
No individual can think his way around his own Attractors, since they are embedded in the structure of thought. And in human beings, an Attractor's influence is not confined to its mind of origin. The limbic brain sends an Attractor's sphere of influence exploding outward with the exuberance of a nova's gassy shell. Because limbic resonance and regulation join human minds together in a continuous exchange of influential signals, every brain is part of a local network that shares information--including Attractors.
Limbic Attractors thus exert a distorting force not only within the brain that produces them, but also on the limbic networks of others--calling forth compatible memories, emotional states and styles of relatedness in them. Through the limbic transmission of an Attractor's influence, one person can lure others into his emotional virtuality. All of us, when we engage in relatedness, fall under the gravitational influence of another's emotional mind with ours. Each relationship is a binary star, a burning flux of exchanged force fields, the deep and ancient influences emanating and felt, felt and emanating.
The limbic transmission of Attractors renders personal identity partially malleable---the specific people to whom we are attached provoke a portion of our everyday neural activity. Ongoing exposure to one person's Attractors does not merely activate neural patterns in another--it also strengthens them. Long-standing togetherness writes permanent changes into a brain's open book.
In a relationship, one mind revises another; one heart changes its partner. This astounding legacy of our combined status as mammals and neural beings is limbic revision: the power to remodel the emotional parts of the people we love, as our Attractors activate certain limbic pathways, and the brain's inexorable memory mechanism reinforces them.
Who we are and who we become depends, in part, on whom we love.
Source: A General Theory of Love by Thomas Lewis, M.D., Fari Amini, M.D., Richard Lannon, M.D.
A Love Story
Paul and Patricia Churchland met when she was nineteen and he was twenty, and they have been married for almost forty years. Both are professors of philosophy at the University of California at San Diego. They test ideas on each other; they criticize each other's work. Their work is so similar that they are sometimes discussed, in journals and books, as one person.
When they met, Paul and Pat were quite different from each other and from what they are now: he knew about astronomy and electromagnetic theory, she about biology and novels. But as time went on they taught each other what they knew, and the things they didn't share fell away.
Paul sometimes thinks of Pat and himself as two hemispheres of the same brain--differentiated in certain functions but bound together by tissue and neuronal pathways worn in unique directions by shared incidents and habit. To imagine his wife's brain joined to his is merely to exaggerate what is actually the case--two organisms evolving into one in a shared shell.
Paul is suspicious of those of us who rely on our basic perceptions of seeing, hearing and touching to make meaning of our world but he concludes we cannot help perceiving the world through the medium of our ideas about it. It's not just a matter of what we pay attention to but of what we actually see. Pat realizes that philosophy can actually change your experience of the world. And if it could change your experience of the world then it had the potential to do important work, as important as that of science, because coming to see something in a wholly different way was like discovering a new thing.
In recent years, Paul has spent much of his time simulating neural networks on a computer in an attempt to figure out what the structure of cognition might be. Thinking must be distributed widely across the brain, since individual cells continually deteriorate without producing, most of the time, any noticeable effect. It seems to him likely that thinking takes place simultaneously along millions of different neural pathways, each of which was formed by a particular stimulation in the past and which is, in turn, greatly or minutely altered by the new experience of the present. All of these pathways, connecting each neuron to millions of others, form unique patterns that together are the creature's memory. When the creature encounters something new, its brain activates the pattern that the new thing most closely resembles in order to figure out what to do.
Sometimes, Paul likes to imagine a world in which language has disappeared altogether. We know that the two hemispheres of the brain can function separately but communicate silently through the corpus callosum, he reasons. Presumably, it will be possible, someday, for two separate brains to be linked artificially in a similar way and to exchange thoughts infinitely faster and more clearly than they can now through the muddled, custom-clotted, serially processed medium of speech. He already talks about himself and Pat as two hemispheres of the same brain. Who knows, he thinks, maybe in his children's lifetime this sort of talk will not be just a metaphor.
Source: Two Heads, The New Yorker, February 12, 2007
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