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  1. Science & Tech
16 April 2015

A hard problem for soft brains: is there a Hard Problem?

Daniel Dennett wants to convince Tom Stoppard that there is no Hard Problem.

By Michael Brooks

Oh, to have been a fly on the wall when the philosopher Daniel Dennett chatted with Tom Stoppard. The conversation took place after a performance of Stoppard’s new play about consciousness, The Hard Problem. A few days earlier, Dennett had told an audience at the Royal Institution (RI) that there is no “Hard Problem”.

The play’s name comes from the label that the Australian cognitive scientist David Chalmers gives to the task of understanding consciousness. This is hard, he says, because no physical phenomena will ever be found to account for the emergence of conscious experience. It is a statement of faith but one that has garnered plenty of support and clearly caught Stoppard’s attention.

Consciousness is a tough nut to crack. Scientists aren’t sure how to define it and they don’t know how it – whatever “it” is – emerges from the squidgy, biological matter of the brain. Somehow, billions of neurons connect and give us the ability to sense the outside world and have what we describe as “feelings” about our experience.

To Stoppard, consciousness is an almost supernatural phenomenon – something beyond the reach of science. His play suggests that those who indulge in spiritual beliefs might be more successful in hunting down the root of consciousness, as if consciousness inhabited some realm beyond physics, chemistry and biology.

Dennett, on the other hand, thinks that we may have already solved the problem of consciousness with a coterie of small-scale, rather banal explanations. The non-mysterious ways in which the brain creates our sensory experience might be the only ingredients we need to explain how it is that we are aware of feeling something.

He expands on this possibility in his contribution to a new collection of essays at edge.org that asks the question: “What scientific idea is ready for retirement?” He chooses the Hard Problem (even though, he says, it isn’t actually a scientific idea) and suggests we should approach all of its difficulties in the same way as scientists approach extrasensory perception and telekinesis: as “figments of the imagination”.

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The central issue concerns our trouble with believing in the physicality of things we cannot see or touch. Software, Dennett suggested at the RI, provides a good example. Everyone agrees that software exists and performs tasks that are far from mysterious. But what is it made of? Lines of code written on a piece of paper do nothing. When written into a computer, they become abstract information encoded in the electronic state of silicon chips – we know that they are there but they are transformed. However hard that is to grasp, it doesn’t
make software spiritual or take it beyond analysis.

A word of caution: there is always a danger of interpreting our scientific struggles within a familiar paradigm. Newton discovered his “clockwork heavens” in an age when accurate means of measuring time were the central goal of many scientifically minded colleagues. Einstein’s special relativity, which defines the fundamentals of the universe in terms that reference light and signals, was birthed in the era of the electric telegraph. Neither was the final word.

These days, much of physics and biology focuses on issues of information transfer, probably because computing now plays such a significant role. So it is possible that Dennett’s software analogy is an innocent sleight of hand. It may be that we haven’t yet encountered the paradigm that will allow us to frame a good understanding of consciousness.

That would certainly make consciousness a hard problem to solve right now – but still not the Hard Problem.

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