Decades-long Bet on Consciousness Ends

Christof Koch wagered David Chalmers 25 years ago that researchers would learn how the brain achieves consciousness by now. But the quest continues. From a report: A 25-year science wager has come to an end. In 1998, neuroscientist Christof Koch bet philosopher David Chalmers that the mechanism by which the brain's neurons produce consciousness would be discovered by 2023. Both scientists agreed publicly on 23 June, at the annual meeting of the Association for the Scientific Study of Consciousness (ASSC) in New York City, that it is an ongoing quest -- and declared Chalmers the winner. What ultimately helped to settle the bet was a study testing two leading hypotheses about the neural basis of consciousness, whose findings were unveiled at the conference. "It was always a relatively good bet for me and a bold bet for Christof," says Chalmers, who is now co-director of the Center for Mind, Brain and Consciousness at New York University. But he also says this isn't the end of the story, and that an answer will come eventually: "There's been a lot of progress in the field." Consciousness is everything that a person experiences -- what they taste, hear, feel and more. It is what gives meaning and value to our lives, Chalmers says. Despite a vast effort, researchers still don't understand how our brains produce it, however. "It started off as a very big philosophical mystery," Chalmers adds. "But over the years, it's gradually been transmuting into, if not a 'scientific' mystery, at least one that we can get a partial grip on scientifically." [...] The goal was to set up a series of 'adversarial' experiments to test various hypotheses of consciousness by getting rival researchers to collaborate on the studies' design. "If their predictions didn't come true, this would be a serious challenge for their theories," Chalmers says. The findings from one of the experiments -- which involved several researchers, including Koch and Chalmers -- were revealed on Friday at the ASSC meeting. It tested two of the leading hypotheses: integrated information theory (IIT) and global network workspace theory (GNWT). IIT proposes that consciousness is a 'structure' in the brain formed by a specific type of neuronal connectivity that is active for as long as a certain experience, such as looking at an image, is occurring. This structure is thought to be found in the posterior cortex, at the back of the brain. GNWT, by contrast, suggests that consciousness arises when information is broadcast to areas of the brain through an interconnected network. The transmission, according to the theory, happens at the beginning and end of an experience and involves the prefrontal cortex, at the front of the brain.

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