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This is OnPoint. I'm Megna Chakrabardi.

We exist. We eat, drink, breathe.

We watch and listen.

We plan things through, such as when she steps out of the elevator, then I'll step in.

But a robot could do a lot of that.

What's different is that we watch ourselves as we do these things.

We think about ourselves and everything around us.

We feel waves of different emotions as we move through our lives.

And we call that consciousness.

So central to our existence and yet nobody really knows what consciousness actually is.

Christophe Koch is a neuroscientist who has devoted his career to looking for traces

or footprints of consciousness in the folds of the brain.

David Chalmers is a philosopher.

He too has devoted his life to figuring out what consciousness is.

Well, the two of them have a great story to tell about their quest.

It involves expensive wine, some good laughs, and a lot of big questions.

And Christophe Koch joins me now from Seattle.

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