A recent conversation on Reddit is all about an illustration from one of my books. It’s a diagram showing a 3D space with lots of different states of consciousness depicted as blobs floating in space.

Consciousness is famously a “hard problem” of science: We don’t precisely know how the physical matter in our brains translates into thoughts, sensations, and feelings. But an emerging research tool ...

The science of consciousness has not lived up to expectations. Over the summer, the neuroscientist Christof Koch conceded defeat on his 25-year bet with the philosopher David Chalmers, a lost wager ...