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"When he signed up for a psychedelic retreat run by a mysterious Argentine woman deep in Brazil's rainforest in early 2018, Ernesto Londoño, a veteran New York Times journalist, was so depressed he had come close to jumping off his terrace weeks earlier. His nine-day visit to Spirit Vine Ayahuasca Retreat Center included four nighttime ceremonies during which participants imbibed a vomit-inducing plant-based brew that contained DMT, a powerful mind-altering...

"Christof Koch explores the only thing we directly experience: consciousness. At the book's heart is integrated-information theory, the idea that the essence of consciousness is the ability to exert causal power over itself, to be an agent of change. Koch investigates the physical origins of consciousness in the brain and how this knowledge can be used to measure consciousness in natural and artificial systems"-- Provided by publisher.