After reading Iain McGilchrist‘s extended essay The Divided Brain and the Search for Meaning I was trying to summarise what it said, it being itself a summary of his great book The Master and His Emissary , to daughter Becky on the ‘phone. Here is more or less what I found myself saying:
When you look at a brain, not just a human brain but any animal brain, the most striking thing about it is that it is separated into two halves. When you look more closely you find that the connection between the two halves (the corpus callosum), deep inside, is surprisingly small in size. And when you look closer still, using sophisticated techniques of modern science, you find that 80% of the messages passing though this connection are inhibitory. On the face of it this is very strange. It seems that the two halves of the brain, the seat of what seems, self-evidently, to be a unified self, are being carefully kept apart.
McGilchrist pointed out another strange thing in The Master and His Emissary: People who have had their hemispheres completely separated, as is sometimes done as a desperate remedy for intractable epilepsy, are not greatly incapacitated as a result. He asks “why ever not?”.
He further points out that the two halves of the brain, when closely compared, are not mirror images of one another, but are actually quite different in both shape and internal structure.
His explanation for this profound division of the brain is that there are two ways of modelling the world, both necessary, but completely different from one another. And one half of the brain is adapted to do it one way, and the other the other. We need both, but most of the time they must be kept separate. This is because they are completely different kinds of things – or different kinds of models.
But how can we describe this difference between these kinds of modelling? Shall we say that one brain (the right) is touchy-feely, instinctive, direct experience, while the other is measured, analysed, codified, processed? Perhaps. But the idea that I found myself repeating to Becky was simpler: one (the left this time) is the map and the other is the territory. Which ties in with the old adage: ‘the map is not the territory‘. The two are not the same, not even when they appear to be. I see this as important in the modern world because the more sophisticated the ‘map’ becomes the stronger the illusion that it actually is the territory.
Another idea of mine is that the right brain model is analogue (like a vinyl record) and the left digital (like a CD) – again entirely different in kind, but all-too-easily producing the illusion of being exactly the same. But I would like to know what McGilchrist thinks of that.
That is what I said to Becky, but McGilchrist also goes on to show that these two different ways of modelling the world are reflected in different ways of organising society and deciding its priorities. That both are necessary, but that the society we are living in at the moment leans far too much towards the left-brain model.
Of the myriad aspects of life to which this analysis is applicable, I am currently preoccupied with the difference between living according to the rules and living according to something beyond the rules. I see here an explanation for how reasonable people are currently disagreeing violently over the question of whether it is right to avoid paying tax by means of clever manipulation of ‘the rules’. In this case the violence of the disagreement arises from the fact that each party sees it as self-evident that his or her approach is correct. I would go as far as to say that people who spend a lot of time playing sport are used to seeing the clever manipulation of rules as self-evidently virtuous. And that links with a visceral distaste I feel for the current tendency to describe people engaged in human activities as ‘players’. So, while the terms of such arguments appear to be the same, in fact they are so different that they cannot be meaningfully compared. They ought to be kept separate, in two carefully divided halves of comprehension, but here they clash with a terrible thunder.