What is consciousness?: Materialists

The iron rod

In 1848, Phineas Gage survived an iron rod blasting through his frontal lobe and became a different person. Responsible Gage became impulsive, profane, unable to hold a job. His skull is in a museum at Harvard. His case is the founding data point of a science that has spent 175 years accumulating evidence for a single conclusion: consciousness is what brains do.

We find the mystification insulting. Not to us — to the brain. Three pounds of tissue producing Shakespeare and seizures simultaneously, generating the felt world from electrochemical signals at 270 miles per hour. The idea that this structure needs a soul or a cosmic field is not humility. It is failure to take the organ seriously.

The evidence is not ambiguous

Damage the fusiform face area: lose face recognition. Stimulate the temporal lobe: patients report mystical experiences. Penfield showed in the 1950s that an electrode touching the right spot could make a patient hear a specific song. If consciousness were something beyond brain activity, these manipulations would not work. They work every time.

The hard problem sounds profound until you examine it. Why does H2O produce wetness? Why does genetic recombination produce life? Vitalists asked the same structural question for centuries. The answer was that life is not a substance added to chemistry — it is what certain chemical systems do.

The panpsychists claim you cannot get experience from non-experience. You also cannot get liquidity from non-liquid molecules, but nobody posits that water molecules are slightly wet. The mysterians we find most frustrating — their position is unfalsifiable. Every previous claim of permanent cognitive limitation was wrong.

Where we concede ground: We have not solved the hard problem. Correlation is not explanation, and our certainty about the future is not evidence.

What would change our mind: A perfect atom-by-atom brain simulation that fails to produce consciousness.

Read the full synthesis: What is consciousness?