Happy New Year 2025! To celebrate, here is an encore of what proved to be the most popular episode of 2024.

This rerun combines episodes 30 and 31 into one epic journey towards the frontiers of human understanding. My guest is Donald Hoffman. Our topics are consciousness, cosmos, and the meaning of life.

Enjoy!

Original show notes

Laws of physics govern the world. They explain the movements of planets, oceans, and cells in our bodies. But can they ever explain the feelings and meanings of our mental lives?

This problem, called the hard problem of consciousness, runs very deep. No satisfactory explanation exists. But many think that there must, in principle, be an explanation.

A minority of thinkers disagree. According to these thinkers, we will never be able to explain mind in terms of matter. We will, instead, explain matter in terms of mind. I explored this position in some detail in episode 17.

But hold on, you might say. Is this not contradicted by the success of natural sciences? How could a mind-first philosophy ever explain the success of particle physics? Or more generally, wouldn't any scientist laugh at the idea that mind is more fundamental than matter?

No — not all of them laugh. Some take it very seriously.

Donald Hoffman is one such scientist. Originally working with computer vision at MIT's famous Artificial Intelligence Lab, Hoffman started asking a simple question: What does it mean to "see" the world? His answer begins from a simple idea: perception simplifies the world – a lot. But what is the real world like? What is “there” before our perception simplifies the world? Nothing familiar, Hoffman claims. No matter. No objects. Not even a three-dimensional space. And no time. There is just consciousness.

This is a wild idea. But it is a surprisingly precise idea. It is so precise, in fact, that Hoffman’s team can derive basic findings in particle physics from their theory.

A fascinating conversation was guaranteed. I hope you enjoy it. If you do, consider becoming a supporter of On Humans on ⁠⁠Patreon.com/OnHumans⁠⁠.

MENTIONS

Names: David Gross, Nima Arkani-Hamed, Edward Whitten, Nathan Seiberg, Andrew Strominger, Edwin Abbott, Nick Bostrom, Giulio Tononi, Keith Frankish, Daniel Dennett, Steven Pinker, Roger Penrose, Sean Carroll, Swapan Chattopadhyay

Terms (Physics and Maths): quantum fields, string theory, gluon, scattering amplitude, amplituhedron, decorated permutations, bosons, leptons, quarks, Planck scale, twistor theory, M-theory, multiverse, recurrent communicating classes, Cantor’s hierarchy (relating to different sizes of infinity... If this sounds weird, stay tuned for full episode on infinity. It will come out in a month or two.)

Terms (Philosophy and Psychology): Kant’s phenomena and noumena, integrated information theory, global workspace theory, orchestrated objective reduction theory, attention schema theory

Books: Case Against Reality by Hoffman, Enlightenment Now by Steven Pinker

Articles etc.: For links to articles, courses, and more, see ⁠https://onhumans.substack.com/p/links-for-episode-30⁠

Encore | The Mindbending Conversation That Topped 2024 (with Donald Hoffman)