Uploaded February 2026 | Updated September 2026, 1 week ago
Roger Penrose, Sabrina Gonzalez Pasterski, and Max Tegmark debate whether consciousness is computational, and what that would mean - for physics, for AI, and for us.
Is our brain more like a classical or a quantum computer? And how can we know if consciousness is quantum mechanical, when quantum mechanics is itself incomplete?
With a free trial, you can watch the full debate at iai.tv/video/cracking-the-code-for-thought?utm_source=YouTube&utm_medium=description
The idea that the brain is computational has, from the outset, been central to neuroscience. Like a computer, the brain is a problem-solving machine that stores memories and processes information. But despite the advances in AI, many challenge whether this analogy captures the essence of the mind. Computers use transistors to build elementary logic gates, enabling them to store files exactly, in 0s and 1s. They are precise and repeatable. Human brains, in contrast, are biological—the neurons do not operate as simple logic gates, but have thousands of inputs, and their output is dependent on past activity and their current internal state. Remove a computer’s processor, and it breaks. But humans can survive with only one brain hemisphere. Fundamentally, brains think, they have perception, and are conscious.
Is it a mistake to see the mind as computational? Are computers, at root, limited machines with little in common with the sophistication of living things? Or have computers and mathematics uncovered the essential character of thought—and perhaps even the cosmos itself?
#consciousness #physics #quantummechanics #artificialintelligence #everett
Roger Penrose is a world-renowned mathematician, mathematical physicist, philosopher of science and Nobel Laureate in Physics. He is best known for his work on general relativity and black holes, and for his public appearances popularising physics and philosophy.
Max Tegmark is a Swedish‑American MIT physicist and cosmologist, and president and co-founder of the Future of Life Institute. He is known for championing the Mathematical Universe Hypothesis and pioneering the notion of consciousness as a state of matter.
Sabrina Gonzalez Pasterski is a theoretical physicist at the Perimeter Institute whose work on space, time, and gravity has been cited by Stephen Hawking. She now leads efforts to encode the universe as a hologram, a bold step toward uniting quantum theory with general relativity.
The Institute of Art and Ideas features videos and articles from cutting edge thinkers discussing the ideas that are shaping the world, from metaphysics to string theory, technology to democracy, aesthetics to genetics. Subscribe today! iai.tv/subscribe?utm_source=YouTube&utm_medium=description&utm_campaign=cracking-the-code-for-thought
00:00 Intro
00:37 Roger Penrose: Consciousness cannot be computational
05:15 Max Tegmark: The brain is a classic computer, not a quantum computer
07:45 Sabrina Pasterski: I want the brain to be computational
10:23 Roger Penrose: Quantum mechanics is inconsistent
10:53 Max Tegmark: Everett was right, the Copenhagen interpretation is wrong
15:32 Things can be in two places at once
17:19 Roger Penrose: The cerebellum could well be like a computer
18:34 Sabrina challenges Roger
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For articles: iai.tv/articles
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Roger Penrose, Sabrina Gonzalez Pasterski, and Max Tegmark debate whether consciousness is computational, and what that would mean - for physics, for AI, and for us.
Is our brain more like a classical or a quantum computer? And how can we know if consciousness is quantum mechanical, when quantum mechanics is itself incomplete?
With a free trial, you can watch the full debate at iai.tv/video/cracking-the-code-for-thought?utm_source=YouTube&utm_medium=description
The idea that the brain is computational has, from the outset, been central to neuroscience. Like a computer, the brain is a problem-solving machine that stores memories and processes information. But despite the advances in AI, many challenge whether this analogy captures the essence of the mind. Computers use transistors to build elementary logic gates, enabling them to store files exactly, in 0s and 1s. They are precise and repeatable. Human brains, in contrast, are biological—the neurons do not operate as simple logic gates, but have thousands of inputs, and their output is dependent on past activity and their current internal state. Remove a computer’s processor, and it breaks. But humans can survive with only one brain hemisphere. Fundamentally, brains think, they have perception, and are conscious.
Is it a mistake to see the mind as computational? Are computers, at root, limited machines with little in common with the sophistication of living things? Or have computers and mathematics uncovered the essential character of thought—and perhaps even the cosmos itself?
#consciousness #physics #quantummechanics #artificialintelligence #everett
Roger Penrose is a world-renowned mathematician, mathematical physicist, philosopher of science and Nobel Laureate in Physics. He is best known for his work on general relativity and black holes, and for his public appearances popularising physics and philosophy.
Max Tegmark is a Swedish‑American MIT physicist and cosmologist, and president and co-founder of the Future of Life Institute. He is known for championing the Mathematical Universe Hypothesis and pioneering the notion of consciousness as a state of matter.
Sabrina Gonzalez Pasterski is a theoretical physicist at the Perimeter Institute whose work on space, time, and gravity has been cited by Stephen Hawking. She now leads efforts to encode the universe as a hologram, a bold step toward uniting quantum theory with general relativity.
The Institute of Art and Ideas features videos and articles from cutting edge thinkers discussing the ideas that are shaping the world, from metaphysics to string theory, technology to democracy, aesthetics to genetics. Subscribe today! iai.tv/subscribe?utm_source=YouTube&utm_medium=description&utm_campaign=cracking-the-code-for-thought
00:00 Intro
00:37 Roger Penrose: Consciousness cannot be computational
05:15 Max Tegmark: The brain is a classic computer, not a quantum computer
07:45 Sabrina Pasterski: I want the brain to be computational
10:23 Roger Penrose: Quantum mechanics is inconsistent
10:53 Max Tegmark: Everett was right, the Copenhagen interpretation is wrong
15:32 Things can be in two places at once
17:19 Roger Penrose: The cerebellum could well be like a computer
18:34 Sabrina challenges Roger
For debates and talks: iai.tv
For articles: iai.tv/articles
For courses: iai.tv/iai-academy/courses
