Psychedelics, consciousness, and the nature of reality

Psychedelics have forced some of the world's sharpest minds to rethink the nature of reality. Do altered states reveal something fundamental about the fabric of existence — or merely about the brain? Is consciousness the ground of reality, or its product, and how does the answer to this question influence the future of science? Bernardo Kastrup, Anil Seth, and Christof Koch join Hans Busstra to debate the hardest questions at the intersection of neuroscience, philosophy, and metaphysics.