Explaining how something as complex as consciousness can emerge from a grey, jelly-like lump of tissue in the head is arguably the greatest scientific challenge of our time. The brain is an extraordinarily complex organ, consisting of almost 100 billion cells — known as neurons — each connected to 10,000 others, yielding some 10 trillion nerve connections.
We have made a great deal of progress in understanding brain activity, and how it contributes to human behavior. But what no one has so far managed to explain is how all of this results in feelings, emotions and experiences. How does the passing around of electrical and chemical signals between neurons result in a feeling of pain or an experience of red?
There is growing suspicion that conventional scientific methods will never be able to answer these questions. Luckily, there is an alternative approach that may ultimately be able to crack the mystery.
For much of the 20th century, there was a great taboo against querying the mysterious inner world of consciousness — it was not taken to be a fitting topic for "serious science." Things have changed a lot, and there is now broad agreement that the problem of consciousness is a serious scientific issue. But many consciousness researchers underestimate the depth of the challenge, believing that we just need to continue examining the physical structures of the brain to work out how they produce consciousness.
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