What is consciousness? This may sound like a simple question but it is not. Consciousness is at once the most obvious and the most difficult thing we can investigate. We seem either to have to use consciousness to investigate itself, which is a slightly weird idea, or to have to extricate ourselves from the very thing we want to study. No wonder philosophers have struggled for millennia with the concept; and for long periods scientists refused even to study it. The good news is that, in the 21st century, ‘consciousness studies’ is thriving. Psychology, biology, and neuroscience have reached the point where they are ready to confront some tricky questions: What does consciousness do? Could we have evolved without it? Is consciousness an illusion? What do we mean by consciousness, anyway?

This does not mean that the mystery has gone away. Indeed, it is as deep as ever. The difference now is that we know enough about the brain to confront the problem head on. How on earth can the electrical firing of millions of tiny brain cells produce this—my private, subjective, conscious experience?

(Susan Blackmore, Consciousness: A Very Short Introduction)

In the philosophy of mind, mind–body dualism denotes either the view that mental phenomena are non-physical, or that the mind and body are distinct and separable. Thus, it encompasses a set of views about the relationship between mind and matter, as well as between subject and object, and is contrasted with other positions, such as physicalism and enactivism, in the mind–body problem.

(Wikipedia)

Confronted with the luminous intricacies of being human, it is easy to see why dualism is so attractive to us. It not only allows us to ignore the issue of how brains might produce consciousness – in this view they don’t, not directly at least – but a separate, detachable, immaterial self can transcend a finite human life span, go off on out-of-body adventures, communicate mind-to-mind, and all manner of other handy things. But what could it be, this supernatural plug-in person? Of what could it be constituted, and by whom or what? How could the data connection function between it and the physical brain? These questions are at least as hard as trying to understand how that brain might give rise to subjective experience – much harder perhaps, it seems to me.

We know from tragic cases of brain injury, disease, and surgical intervention just how profoundly consciousness, and the sense of self, are affected by gross changes to the physical structure of the brain (Blackmore,  ibid., pp. 25ff.). It seems obvious to me then, as a layman, that my own subjectivity is, after all, a result – however subtle – of electrochemical processes within my own nervous system, and that when those processes cease, as they will when I die, so that subjectivity will cease also.

But this is not a crude oversimplification, nor a bad thing in itself. It is just how things are, to the best of our understanding. The human brain is a structure of mind-boggling intricacy (it is estimated that there are around 86 billion neurons in the average brain, each neuron of which connects to about 1,000 others). It seems to me entirely feasible that the human personality and consciousness could arise from such vast computing power. But how this comes about remains, still, the mystery.

I take it to be axiomatic, therefore, that our notions of meaning, morality, and value presuppose the actuality of consciousness (or its loss) somewhere. If anyone has a conception of meaning, morality, and value that has nothing to do with the experience of conscious beings, in this world or in a world to come, I have yet to hear of it. And it would seem that such a conception of value could hold no interest for anyone, by definition, because it would be guaranteed to be outside the experience of every conscious being, now and in the future.

The fact that the universe is illuminated where you stand—that your thoughts and moods and sensations have a qualitative character in this moment—is a mystery, exceeded only by the mystery that there should be something rather than nothing in the first place. Although science may ultimately show us how to truly maximize human well-being, it may still fail to dispel the fundamental mystery of our being itself. That doesn’t leave much scope for conventional religious beliefs, but it does offer a deep foundation for a contemplative life. Many truths about ourselves will be discovered in consciousness directly or not discovered at all.

(Sam Harris, Waking Up: Searching for Spirituality Without Religion)

This is one of the things that contemplative practice so clearly demonstrates: all that we know, or feel, or perceive, takes place in consciousness. In choiceless awareness all things can be seen directly to arise in consciousness: the rising and falling of my chest, the warm cooing of the wood pigeons in the trees behind the garden, an idea for a blog post, the grumble of a bus leaving the stop outside the gate, the ache in my knee. All these and more appear in consciousness – where else could they appear? – and my only connection with them is in that appearing. Even the ones that affect me directly, like the breeze through the open window, that is beginning to cool as evening comes on, I only know about as their effects on me – my cooling skin – appear in my awareness.

To remain still, not seeking or holding, within the bright field of awareness, the isness of all that arises in my mind is not other than the isness of things in themselves: the open ground in which things arise, and pass.