Psychophysical Harmony

I wanted to write about the argument from psychophysical harmony against naturalism, even though it has no force for those like me who think that talk of qualia and phenomenality in general is confused. For the argument to make any sense at all, we will first have to assume that such considerations as the Knowledge Argument (i.e. the Mary's Room thought experiment from Frank Jackson) have persuaded us that physicalism is inadequate for the task of accounting for phenomenal experience. The argument from psychophysical harmony then goes farther, suggesting that there cannot be any sort of neutral natural explanation at all for the mysterious appropriateness of our experience in representing the physical world. Instead we might need to invoke God, or if not God then perhaps some other benevolent purposeful force or principle such as John Leslie's axiarchism.

Applying Illusionism to Physical Reality

Many of you would be aware already of illusionism, if in fact there were many readers of this blog. But in case it's needed, illusionism, exemplified by Keith Frankish and Daniel Dennett, is an approach to the philosophy of consciousness which claims that qualia (the ineffable irreducible feelings associated with conscious experience, e.g. the redness of red), are entirely illusory and do not actually exist. As such, on this view the Hard Problem of Consciousness as defined by David Chalmers simply dissolves -- we need only explain why we believe we experience qualia, we do not need to explain how it is that qualia can be produced by physical stuff. As a bonus, illusionism may claim that even the idea of qualia are incoherent.

Illusionism is, I would say, a species of functionalism, and so is compatible with and largely overlaps with other glosses on functionalism such as computationalism. There may be corner cases where some illusionists may disagree with some computationalists, especially on how best to describe things, but the stories they tell about human consciousness are mostly compatible. As such, I count myself as an illusionist, a functionalist and a computationalist.

What I wanted to write about today is a strong rhyming I've noticed between the illusionist view of consciousness and how I think of the stuff of physical reality.

In Defence of Strong AI: Qualia and Mary's Room

Photo: brokenview

The Mary's Room thought experiment considers a brilliant neuroscientist who has been raised and educated in an entirely colourless environment. It was originally proposed by Frank Jackson as follows:

Mary is a brilliant scientist who is, for whatever reason, forced to investigate the world from a black and white room via a black and white television monitor. She specializes in the neurophysiology of vision and acquires, let us suppose, all the physical information there is to obtain about what goes on when we see ripe tomatoes, or the sky, and use terms like ‘red’, ‘blue’, and so on. She discovers, for example, just which wavelength combinations from the sky stimulate the retina, and exactly how this produces via the central nervous system the contraction of the vocal cords and expulsion of air from the lungs that results in the uttering of the sentence ‘The sky is blue’. [...] What will happen when Mary is released from her black and white room or is given a color television monitor? Will she learn anything or not?

On the day she is allowed to emerge from her confinement, she sees the colourful world for the first time. "Wow!" she says, as she takes it all in. Though she knew everything there was to know about the human brain and everything there was to know about the physics of colour, she had never before known what it was like to experience it first-hand.

But if she now knows something she didn't know before, then evidently she could not have known everything there was to know about colour before her escape. This surely proves that conscious experience transcends physics and neuroscience. Physicalism (the belief that everything is the result of physical interactions) must simply be wrong. Right?

Well, not really...