• Longevity guru Bryan Johnson has long had questions about the bounds of human consciousness. • He says smoking a psychedelic found in Sonoran toad venom gave him clarity. • He said it revealed the "most expansive map" of human consciousness.

Longevity enthusiast Bryan Johnson said he often contemplates a question that has perplexed philosophers for centuries — how big is human consciousness?

So he decided to turn to psychedelics.

"I know what it feels like to fall in love, and to feel sad, and to feel envy, and to feel joy, and to feel accomplishment, and to feel shame," Johnson said on the Core Memory podcast on Thursday. "But what else?"

Johnson said he wanted to create a "map" of human consciousness to explore the convergence of mind and machine. "If you can, in fact, pair the

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