Part 21/23:
Greene's personal experiences also shape his worldview. He recounts experimenting with psychedelics, which underscored his conviction that consciousness depends on physical brain chemistry. His vivid account of a frightening, intense psychedelic episode reinforced his stance that consciousness emerges from particles and physical laws.
He acknowledges that the "hard problem"—how subjective experience arises—is still unsolved. However, he remains optimistic that future neuroscientific advances will demonstrate that consciousness is an emergent property and not some mystical phenomenon.