We can now reconcile the accumulated knowledge of science with spirituality and the ancient faiths about God. From the study of the brain we know that it is responsible for our thoughts, emotions, and memories. This knowledge affects everyone because it defines our inner selves. Neuroscientists from all over the world now agree that the brain is a very complex (living, loving) machine, controlled by the principles of chemistry, electronics, and biology. It consists of huge numbers of cells, called neurons, that cause us to perceive, categorize, and remember the world. Though we don't yet understand all the details, we know the basic principles. This knowledge is extraordinarily important, because it provides clues about how the mind is linked to the brain and to spirituality. Thoughts, emotions, and memories are represented in the brain by neurons, through a sequence of electrical and chemical signals. Since we only see the world through our senses, our knowledge of the world is entirely a construct of them. But we also know that senses are directly influenced by emotions and memories.
Maturing throughout childhood, the brain gains experience and new capacities, and we become adept at predicting what will happen in a wide variety of situations. But much of the organization of the brain is determined at birth. Infants must focus on survival, so they have an overpowering necessity to find parents (or anyone who listens) and cry for food. They learn to recognize faces, sounds and smells in a fuzzy new world, but it remains challenging and mysterious. Even when an infant at 6-12 months has learned to attract parents with smiles and laughter, though they are loved and trusted, parents still remain mysterious. The infant wonders where they come from, where they go, and why parents are sometimes willing to give, but other times not. Parents are powerful mysterious forces that have their own will but can be controlled and reasoned with to some extent. These facts of life are the basis for our spirituality. We expect food, attention, and security from parents, and this is remembered in adult life as "God". When we sense the existence of a "being" giving love and security, we remember the awareness of our parents when we were infants.
For each one of us, the world is large, complex, and mysterious, but for our ancestors God was larger, and this placed much of the world's mystery in perspective. Modern knowledge allows us to redefine this relationship. Our ancestors' God still exists for us in nearly the same form, because our inner lives are very much like theirs. But in addition we now understand that God is a capacity of our brains, and is part of our mind.
In prehistoric times, human cultures that developed a collective "relationship" with a god were endowed with the good fortune of his favor. Such an arrangement over time was often condensed into a religion in which the spirit was defined either directly through an image, or by example as in the parables of the Bible. The social force of such a religious contract allowed laws to be laid out concerning proper personal and group conduct. God kept the promise as long as we humans did. If humans didn't fulfill their religious contract, then God was not obliged to. Over the millenia, this gave logic to repeating themes of success and disaster. Because of the difficulty of performing unswervingly to a divine standard, humans could seldom live by their part of the contract. In effect, the result of believing in an unfailing god was to give humans responsibility for their own failures. The advantage, however, was to give humans indirect responsibility for their success.
Some doubted the existence of a God because he had never been seen. However in the minds of many, faith about his existence was based in his power. The case for God's existence was well accepted, especially by learned people, many of whom where involved in religious protocol. And equally important, since the emotional power of God could be felt directly by anyone receptive to His message, a religion grew when the faithful espoused the particular advantages of the faith. Thus, "faith in God" became common if not inevitable. Even if God's image could never be seen by most, with diligence and some effort one could acquire faith. From this accrued the intangible benefit of the religion's spiritual contract, and along with it, the real benefit of belonging to a community with its specific code of conduct. Thus faith in God was part of everyone's life, even if God's visage was not. Although one might choose not to believe, certainly one lived in a world that did.
As knowledge about Nature accumulated, the belief that God had created the world and its contents became a bit old-fashioned. The idea that the beauty of the world had been created by God seemed to some out of date, because now much was understood about physics, chemistry, and biology. If one was awe-struck by a beautiful sunrise, a little knowledge of astronomy and science of the atmosphere could explain where the objective beauty originated. The origin of species in all their diversity and splendor was so well explained by evolution and biochemistry that life on earth seemed not only miraculous but inevitable. Eventually, it seemed possible to answer any question that could be asked about the mysteries of the natural world by reducing the question into a series of smaller ones.
To those who did not follow the new knowledge about the natural world, such "reductionism" seemed a diversion from the obvious spiritual base of our natural world. However, to those active in gathering it, (e.g. the philosophers of ancient Greece and post-Medieval Europe) the reductionist knowledge was the result of asking questions in a way that could be understood in any nation, language, or culture. Knowledge was the set of answers that could be agreed upon. Although the answers redefined the natural world's miraculous beauty in a new language of science, the subjective beauty remained, miraculous.
The literal belief in the origin of the world familiar to us in the story of Genesis eroded gradually over several centuries. The erosion was contested by some who applied a literal view to the Bible stories. However, others accepted the erosion of literal belief as progress, and attempted to weave modern knowledge of the natural world into their religious faith. Some who were thus enlightened assigned the responsibility of their new knowledge to God's will, asserting that the principles of the natural sciences were created by God. Some of these faithful insisted that God had created the universe and given it rules to develop galaxies, stars, the planets, and life on Earth.
Gradually by the last half of the twentieth century, many religions had redefined faith in God away from its earlier basis in literal belief. Ancient notions of God living in the sky and ruling over the star-filled heaven had long since been discarded by the 1960's when the exploration of space produced vivid photographs of the Earth taken from the Moon. Most no longer believed that God literally pulled up the rising sun or enticed plants to grow, but could still rely on "belief in God". After all, there were many unknowns that science had no specific answers for. Although the origin of life proposed by evolutionary biology seemed inevitable according to the theories of chemistry, the organization of the rules of physics and chemistry seemed immutable and therefore evidence of the power of God. The origin of the universe was unknown and might never be known with certainty, so therefore it could still be assigned safely to God. Another basis of faith remained also. The mysterious power of love and the inexplicable ways of human relationships, assigned to the spirit of God for millenia, remained unscathed. Over the last century, modern people have professed a faith in God entirely consistent with the ancient one.
The stories of the Bible are convincing evidence still that human life at the dawn of history was similar in many ways to our busy lives today. The Bible stories are vivid because they relate directly to our own lives, and this is good evidence that the nature of human relationships, motivation, and cultural identity haven't changed much. Although we may not literally believe much in the old stories about the origin of the world, we have a very good reason to continue the "faith in God" that our ancestors invented. We have the same motivation in our daily lives!
A goal of high priority is to revise the language of spirituality so that our children understand concepts of God and the inner life historically defined by many different religions in texts such as the Bible. If children learn about themselves, their culture and world in separately taught subjects, such as politics, science, language and religion, and are also taught explicitly or by omission that the subjects cannot be related directly, they are missing an essential component that was given to our ancestors by their ancient culture. That essential component was continuity. The ancient world, with all of its mysteries and contradictions, provided continuity from family to education and culture with stories and sharing of "the spirit" that many of today's younger generation lack.
Another important goal is to provide better communication between modern cultures. If it is possible that there is a common basis in all humans for spiritual thinking, surely it will benefit all of us to understand in every way possible this common heritage.
Yet knowledge of the brain has progressed to the point where we now understand the brain's basic principles. This knowledge is extraordinarily important, because it provides clues about the origin of our perceptions, thoughts, emotions and anxieties in terms of chemistry and biology. This knowlege provides a basis for understanding the mind as a function of the brain. The mind is not physical in the same sense as the brain, yet it is responsible for our humanity and entire personality. The mind is how our brain perceives and categorizes itself.
Interconnections in the brain are very complex, however, so awareness has many levels. We communicate in many ways beyond speech that are important in interpersonal relationships. For example, hand movements or "body language" give us alternative ways of communicating that imply different modes of consciousness. We can be aware of a person motioning with hands but not immediately recognize the meaning of it in the speech center of our mind. Body movements, like our perceptions, are based on previous experience. For example, we ordinarily do not consciously decide which motions to make with our legs and feet while we walk, yet our gait is distinctive and often uniquely recognizable from a distance.
A neuron creates an action potiential by briefly opening small pores in its cellular membrane, thereby admitting sodium ions (i.e. salt). The result is a very short burst of electricity inside the neuron. The electrical burst quickly travels throughout the cell to the point where the neuron makes contact with its neighbor. This point, called a "synapse" works by releasing a small amount of a chemical, called "neurotransmitter", which diffuses to the neighbor and binds to a chemical receptor (analagous to a taste sensor in the tongue) in the neighbor's cellular membrane. The receptor opens a pore which briefly admits some salt and continues the signal in the neighbor. If the neighbor receives enough of these synaptic inputs, it may also generate an action potential. Another type of synapse is a direct connection between two neurons which allows them to pass electrical signals directly without the use of neurotransmitters.
There are only about 20 types of neurotransmitter in the brain but there are millions of possible perceptions and ideas, so the exact identity of the neurotransmitter that relays a signal from one neuron to the next is relatively unimportant. The identity of the neurotransmitter cannot tell the neighbor much about the many possible ideas it could represent, although its precise chemical properties are necessary for its ability to relay the signal faithfully. More important for the eventual interpretation of the signal is which neighbor neurons receive the signal and when. Thus the type of neurotransmitter utilized is only a vehicle for an idea and cannot represent much of its content. An idea's content is represented more precisely by the millions and millions of interconnected neural circuits that specialize in different types of perception and thought such as color vision or memory or emotion.
Such a "chain" of signals is the vehicle for the traffic of ideas everywhere in the brain. Neurons exist in a plethora of shapes and sizes and but they all work in a similar fashion. Action potential signals inside a neuron are summed together, processed, and sent on to other neurons. A neuron's function is related to its precise location in the neural circuit, which neighbors provide it with signals, exactly how it sums its inputs and exactly what its firing pattern is, and which neighbors it sends a signal to. Neurons are responsible for the outputs of the brain, the control of muscles or the release of hormones.
We perceive the world around us by special "sensory neurons" that are endowed with the ability to sense light, sound, the presence of various types of chemicals, and a dozen or so types of touch sensation and pain. The sensory neurons send their signals like any other neuron in the form of action potentials and chemical and electrical synapses. The job of sensory neurons is to code the sensory information in a way that will be faithfully carried to the brain and interpreted correctly even under difficult situations such as a dark moonless night or a brilliant snowfield under a bright sun.
The activity of neural circuits in sensing the world around us and categorizing this information is the basis of thoughts and the operation of our mind. How the activity of different neurons is related in time and in strength, and exactly how this activity is weighed by myriad circuits determines what thoughts we have. The process of competition between thoughts, largely responsible for human success, is the source of many problems. It is responsible for the dichotomy between "good" and "bad" ideas. The good idea is one that is implemented, has some positive consequence, and is repeated. A bad idea is one that is considered but not put into action. Although such a definition may seem oversimplified, it is to a great extent the basis for our agonizing over difficult decisions. Depending on the complexity of the situation we are faced with, we may need many repetitions before learning which path is "good". The competition in ideas between our internalized parental directives and other needs and desires causes a dichotomy in our minds which has been called the "conscience". This process of competition is carried out at the level of single neurons.
Since both perceptions and signals from memory are relayed in the brain with the same type of "action potential", they are similar and to some extent indistinguishable. Therefore, the strength of a perception has much to do with its immediacy. If other people agree with us on the details, we can agree that our perception represents reality. Our ability to corroborate others in this way depends on our memory, experience, and sometimes on our imagination and ability to empathize. Reality has no other basis in the brain, as the brain is completely dependent on perception to sense the world around it.
Perception, however, is dependent on past experience. In the last 10 years, neuroscience has found that sensory perception (i.e. vision, touch, hearing, etc) is subject to change depending on the sense's experience. Therefore our sense of "the world" around us is dependent not only on what small part of it we can directly sense, but also on how we have sensed it before. Exactly how we are influenced by previous sensory experiences, of course, is dependent on the details of the brain's mechanism of memory.
The reason we are adept at predicting the outcome of such an encounter is the dependency of our sensory perception on memory. We cannot perceive a flower, landscape, or person without associating them with similar perceptions from our past. This is, luckily for us, the way the brain functions. We don't need to be motivated to learn in this manner. Our brain continuously builds collages from our many senses and stores the collage for future reference. Such experience is recalled (whether we are are aware of it or not) with every new sensation. Its mechanism in our brains may seem an almost miraculous adjustment to living in a complex world. This is prejudice.
Unfortunately, although prejudice is necessary for the brain's minute-by- minute function, it causes our attention to be directed to some extent by our past, not entirely the present. Before we can link any new facts together to predict the outcome of a new situation, our experiences from the past take control. The reason is that our actual perception depends on experience. Therefore it takes sometimes quite a lot of new different experiences before our brain reorganizes to "see" things differently. This process of past controlling perception takes place not only in our mind's "awareness" but also at the level of a single neuron.
Even so, much of the organization of the brain is securely determined long before birth. If this were not so, then young mammals would not survive long. The overpowering necessity for the young is to find the parents and in an appropriate way ask for and receive food. Therefore the brains of all infants have this much in common. Every infant needs to recognize "parent" and cry for attention. The visual system of an infant will continue to develop at a great pace for several years, but the infant can recognize faces, sounds and smells in a fuzzy, unknown new world.
Parents, for the infant, are powerful mysterious forces that have their own will but can be controlled and reasoned with to some extent. The infant's recognition of this situation is extremely important. Infants become adept at recognizing the presence of parents. Such a "parent detector" is important because the infant is more likely to survive if parents are near. This fact of life has remained unchanged for centuries.
The "parent detector" in an infant's brain consists of sensors for the parent's body, face, voice, smell and touch. The infant can distinguish parents from strangers and soon develops a repertoire of situations in which the outcome can be predicted. One of these, of course, is that when hunger comes, a plaintive cry will produce a mother who will feed and care for the infant. In the game of "peek-a-boo", the infant finds reassurance that parents, as do other objects, have a physical reality and don't just vanish. The game of "throw toys out of crib" or "spill food on floor" provides additional practice about parental presence.
The need for a "parent detector" is so strong that to be without it literally means death for an infant. All humans share to some extent this facility. We all know what it is like to have parents come to feed us, leave us sad and alone, only to return again (though we may have forgotten the details). The infant's familiarity with this situation is the security that allows curiosity about the world. Because this knowledge of parents is so important to an infant, the tendency to recognize the human face and identify with it may be a genetically programmed facility (i.e. a universal constant) in the infant's brain. Certainly the infant learns afresh many details of how to interact with the "spirit-like" beings who feed, provide warmth and soothe.
When we sense the existence of a "being" who can transmit love, security, and the motivation for making decisions, we are dependent on our perceptual experience in the same manner as any other perception. The memory takes us back to awareness of our parents when we were infants. The infant knows little of the complexity of the world but can directly "feel" the presence of parents. The infant does not know that the awareness is based on vision, hearing, and touch, but for infants who have these senses intact, such knowledge is not important. The important thing is to know when parents are near. This is the basis for the "spirit" that we may sense as God.
The spirit of God is maintained by the adult mind because the spirit provides a sense of security for others' company and culture. In ancient times, this provided an advantage to those communities who maintained feelings of spirits. Communities were closer-knit and their people derived much from extended family ties maintained through common beliefs. In modern times the same benefit persists.
Science is limited by personal experience. It is impossible for any one person to personally verify more than a small fraction of the facts that have been accumulated by modern science. It is also impossible for any person to verify that their own body consists of the incredibly intricate assortment of organs, cells, molecules and atoms discovered by science. Therefore, to believe in "facts" implies a trust in humanity.
If one is in a doubting mood, facts about our biological and chemical constitution seem possibly untrue, somehow less important than life, consciousness, and our love for each other. But when one is in a trusting mood, the facts stand because they are helpful to us. Our interpretation of the facts is dependent on our mind and brain. Therefore, to use facts without verifying them directly is an act of faith in humanity. Science is the one faith in the world that we can all agree upon. If we choose not to use the facts, or if we don't have the time to agree on them, the loss is our own. Yet, using the facts, we understand ourselves with a new dimension.
The ideas of George Fox and the early Quakers were revolutionary for their time, the mid-1600's. Before that time, many religions taught that the "spirit" is outside our bodies and to communicate with the spirit requires a church or priest. By emphasizing that each person has the "Light of God" inside them, the early Quakers were saying something very powerful about the function of the brain. Although they did not have the tools of modern science, they knew that the essence of the "spirit" is inside every one of us humans.
To continue the revelation handed to us by great prophets through history, we need to develop a new language of spirituality, based on traditional principles, that assimilates the modern knowledge of the brain into our everyday lives. We need to give our children not only love, security, and identity, but also a sense of where these intangibles originate, and how they develop. The spirit that we developed as infants about our parents and the immediately surrounding world became more generalized, as we grew up, to include the larger community. How this process develops in any one of us from experience with our own parents is sometimes very personal, but nevertheless it transcends our private boundaries.
An important way to relate development of the spirit to everyday life is to ask ourselves how we know other people are similar to us. To answer this question we may recall early experiences in our life (of "spirits"), generalized by our adult perception of the world. To ask a child to consider how parents can balance their own needs with the child's need for love, discipline, and education requires the child to momentarily overcome internal desires to consider the terms of the relationship ("covenant"). As infants already have a sense of the "spirit" that represents their parents' external love and providing, children who can identify the previously felt internal spirit with a parental covenant and sense of justice are able to generalize this identification to others.
The God presented in the books of the Old Testament is concerned with such issues of equality and fairness. How each person can be treated fairly is an issue that concerns all people in a society as it does parent and child. The story of Exodus, for example, written about a society determining its fate by starting afresh, can be readily understood by young children because it concerns the same issues that they struggle with. In the New Testament, Jesus' simplification of the rules of Judaism was revolutionary because he gave subjective rules for conduct based on "internal spirituality". George Fox's contribution continued to redefine our internal spiritual life. As we ponder our own beliefs, it may be useful to review the history of knowledge about spirits as a continuum. Taken in this context, the recent knowledge of the mind based on neuroscience is a continuation of the progress of spirituality from ancient times.
Traditionally great religions are based in an allegory presented as a series of stories as in the Bible. In prehistoric times such stories were passed through verbal memory from parent to child. When we hear these stories, memories from our own childhood are blended with stories from our parents about their early experiences and their ancestors'. Our spirituality, therefore, is a mixture of all of these but resides inside our minds as a memory from infancy of our own parents' love and care.
Norenzayan A, Shariff AF. (2008) The origin and evolution of religious prosociality. Science. 322:58-62.
Heisenberg M. (2009) Is free will an illusion? Nature. 459:164-165.
Robert G. Smith
rob<at>retina.anatomy.upenn.edu
October, 2009
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