Much of this first volume is a rehash and update of the thesis of McGilchrist’s first book, “The Master and His Emissary” about the differences between the right and left hemispheres of the human brain. “The left hemisphere is, compared with the right hemisphere, unreliable in just about every way that matters. In terms of attention to the world, and its role in thereby constructing, and understanding, experience; in its inability to comprehend time, space and motion; in its lack of skill in conveying and interpreting emotion; in its (lack of a) sense of the body as a living inseparable part of the self; in the comparative weakness of its faculties for direct perception, for the evaluation of beliefs and for making judgments; and indeed in terms of its lesser intelligence (which means understanding): in all of these it is more vulnerable to falsehood, more likely to deceive us, than the right…. There is a tendency in the left hemisphere to turn from the business of dealing with experience towards the process of abstraction and representation…. The right hemisphere seems to be aware of its limitations, as well as of shades of meaning and degrees of truth; and it is more in touch with reality, while the left hemisphere prefers its theory about reality.” McGilchrist, throughout this volume, does always caution that both sides of the brain are important and necessary to processing the lived world most effectively, but it is clear which hemisphere he would prefer if forced to choose.
McGilchrist spends much of the rest of his time relaying how the human brain processes the truths of the world. “It would be irrational to suppose we are directly aware of more than a little of what exists. Why assume that our cognition is capable of more than a few limited forays into the vastness of reality?” For him, subjectivity and objectivity are not bright lines, but ones that may blur. “We can only know the world as our brains construe it; and in every brain there are at least two internally coherent versions of the world that conflict. Science must take this into account when it talks of objectivity.” He quotes Einstein, “Whether you can observe a thing or not depends on the theory which you use.”
Much of this book is also a rebuke of scientific systems that attempt to mechanize the concepts of lived reality. For McGilchrist, a machine is a poor metaphor for the brain or for any living entity. “The left hemisphere's serial, analytic approach is better equipped to deal with a system that is closed, static, linear and predictable – like a machine; not one that is open, constantly flowing, becoming and changing, and ultimately complex and indeterminate – like life. In the left hemisphere's vision, things take priority over processes. It is good at understanding linear cause and effect, not so much reciprocal interaction, let alone a process of co-creation. It understands a whole as simply the assemblage of parts, and causation as from bottom up only, not from many directions at once within the whole. It is at home when it can follow procedures; less so when it comes to recognising new forms, or fields, at work. It prefers what is clearly defined, to what has imprecise boundaries. It doesn't see Gestalten, of which life provides the pre-eminent examples…. This allegiance to the left hemisphere is, then, another reason why, however efficacious biology may have become in terms of manipulating the world, its claims to truth should be treated with care.”
The preeminence of reason in modernity is another bugbear for McGilchrist. “It could be said that the trouble with Western philosophy began with Plato's foregrounding of logos. In the Greek world, as in most pre-modern cultures, there had always existed more than one way of acquiring an understanding of the world. The Greeks, let it not be forgotten, also gave birth to many of the most enduring myths by which we understand our relationship to the world, such as those of Oedipus, of Prometheus, of the gods of the Iliad and of the Odyssey. There was, and is, no conflict here. Indeed they distinguished two types of truth, mythos and logos; each was considered essential in its own proper field.” He quotes Karen Armstrong, “Logos (‘reason’) was the pragmatic mode of thought that enabled people to function effectively in the world. It had, therefore, to correspond accurately to external reality. People have always needed logos to make an efficient weapon, organize their societies, or plan an expedition. Logos was forward-looking, continually on the lookout for new ways of controlling the environment…. Myths may have told stories about the gods, but they were really focused on the more elusive, puzzling, and tragic aspects of the human predicament that lay outside the remit of logos…. They were designed to help people negotiate the obscure regions of the psyche, which are difficult to access but which profoundly influence our thought and behaviour…. A myth was never intended as an accurate account of a historical event; it was something that had in some sense happened once but that also happens all the time.” McGilchrist expands, “Myths were archetypal, not incidental, truths, reflecting eternal patterns that we could recognise, but which could not, without diminishment, be translated into the everyday terms of logos…. Logic was invented in order to win arguments, not to take us closer to the truth. Mythoi by contrast were the ideals of men of action, weighty, performative, supportive of the truth…. This distinction between logos, the literal and the essentially decontextualised, on the one hand, and mythos, the metaphorical and essentially contextual, on the other, is not only grounded in, but maintained by, the difference between the two hemispheres…. Myths 'think themselves' in us all, without our being aware of it…. Something like Jung's collective unconscious may be acting by means of epigenetics, or by means we may as yet be able only to surmise…. One of the most important aspects of many experiences – such as the experience of love, of art of every kind, of the magnificence and beauty of the natural world, of ancient myths and narratives, of the solemnity of a religious ritual or of an ancient tradition—is that they require us to relinquish control. They speak of something much bigger than us, that cannot entirely be articulated; something ancient and enduring, which speaks, if it can be said to speak at all, through us, not just out of us.”
Metaphor is the means that the brain processes reality, according to McGilchrist. “What we are talking about here is a type of essentially metaphorical understanding, of which myth, poetry, drama and ritual are all manifestations. In true metaphor the intention must remain implicit; spelling it out causes its richness and emotional impact to collapse, much as explaining a joke makes it fall flat, or paraphrasing a poem reduces it to a series of banalities…. We do not use metaphor to decorate, and therefore obscure, something best conveyed literally (although that would be how the left hemisphere sees it), but to bring to life a deeper and broader set of meanings than could be conveyed by literal language…. All understanding whatsoever is, at bottom, metaphorical…. Everything has to be expressed in terms of something else, and, as I say, those something elses in language eventually come back to bodily experience. There is nothing more fundamental in relation to which we can understand that…. Metaphor embodies thought and places it, where it belongs, in a living context. In this, it bridges the gap between language and the world, a gap entailed on us by the very nature of language.” He quotes Bryan Magee, “People who live most of their outer or inner lives in terms that are expressible in language – for example, people who live at the level of concepts, or in a world of ideas – are living a life in which everything is simplified and reduced, emptied of what makes it lived, purged of what makes it unique and theirs.” And Ortega y Gasset, “The metaphor is perhaps one of man’s most fruitful potentialities. Its efficacy verges on magic, and it seems a tool for creation which God forgot inside one of His creatures when He made him.”
McGilchrist speaks of how ancient man first saw his world through pictures, and then through insights and intuitions, before explicit reasoning through language. “Pre-modern cultures think in pictures, as well as using direct perception and sensory memory, patterns of smell, light and sound intuitively, in ways that we have lost…. When it comes to problem-solving, visual thinking is far more important than verbal: but, for this very reason, during problem-solving visual perception can get in the way of visual imagery. This may be one of the reasons that we close our eyes when working on a problem: closing the eyes to sight really does increase insight…. Having to verbalise impedes visual memory; it does so not only for faces, and visual image processing, but including things as basic as colour, as well as remembering and identifying tastes and pieces of music, which are obviously not primarily visual at all. Thinking out loud while solving a problem markedly impairs the ability to find solutions to problems using insight, though it has no effect on analytical problems.”
Finally, for McGilchrist, imagination is not just pure fantasy, but a way of seeing reality’s many possibilities. “Imagination is far from certain, of course; but the biggest mistake we could make would be never to trust it – never to believe in it – for fear of being mistaken. For truth requires imagination. It alone can put us in touch with aspects of reality to which our habits of thought have rendered us blind. It leads not to an escape from reality, but a sudden seeing into its depths, so that reality is for the first time truly present…. Our current perceptions are governed by past perceptions and preconceptions; yet these too are always influenced reciprocally, if more weakly, by the new perception, the new experience…. There is no such thing as perception without such ramifications, because we are not just creating a Cartesian representation of the world, but are involved in the process of the experiential world coming into being.”