Justin Riddle Podcast Justin Riddle Podcast

In episode 40 of the Justin Riddle Podcast, Justin provides an update of the Nested Observer Windows (NOW) Model. The paper describing this theory was recently published in the open-access Neuroscience of Consciousness journal (link below) and this video is an extended version of the Plenary talk that Justin gave at the Science of Consciousness conference in April of 2024 in Tucson, AZ (link below to conference recording). The NOW Model describes the mind as a nested hierarchical system in which there are many different cognitive systems within the brain at multiple scales. We are familiar with neuron-centric theories of consciousness, and yet why are we so fixated on the level of the neuron. There are synapses that comprise the neuron, there are microtubule systems within the neurons that appear to be electrically active, and there are neuronal population dynamics above the neuron which display prominent electrical properties. The cellular level is one level within a multi-scalar system. Evidence from cognitive neuroscience is suggesting that the low-frequency macroscopic electrical activity in the brain is closest correlated to cognition and brain stimulation techniques that drive these neural oscillations can reproducibly create changes in cognition. Therefore, it appears that these macroscopic scales are “causally” relevant to cognition. How then do all of these multiple levels connect to each other?

Observations from neuroscience show us that these multiple scales are electrically coupled to each other, a phenomenon called cross-frequency coupling. With coupling across these multiple scales, there is a mechanism for how information processed at different scales can be communicated up and down the nested hierarchy of the brain. The NOW Model essentially takes cross-frequency coupling very seriously. Your mind is at the apex, the top, of the brain hierarchical system and there are nested cognitive processing systems within you. A model by which there are nested cognitive systems explains a whole range of psychological phenomena that are not current explainable under single-level neuron theories of consciousness. For example, the fact that we are only aware of a high level of abstraction of our experience and yet can interact with a rich perceptual landscape and initiated complex motor movements can be explained by an interaction between ourself at the slow apex and the lower levels. Another explanation is how slow our cognition really is: the NOW Model suggests that we are operating in the time range of 1 cycle per second or even slower. Our thoughts are sluggish and filled with abstraction (perhaps a key to intelligence) but contain the richness of the faster systems. Beyond capturing a deeper range of every day experiences, the NOW Model also readily accounts for dissociative identity disorder and new psychotherapy techniques that conceptualize the self as a family (internal family systems). This is just the tip of the iceberg from changing our self-conceptualization from singular into a multiplicity of nested systems. There is a lot of work to be done in this space to validate the potential cognitive reality of the NOW Model!

In episode 39 of the quantum consciousness series, Justin Riddle explores the mechanism behind natural selection in evolution. This is not a question about humans evolving from animals, but instead is raising the question about what is the driving force behind the process of evolution. Charles Darwin described evolution as a random expression of features that are then selected by the environment. The animals that are able to reproduce will preferentially spread their features to next generations. Gradually, species will change based on these survival pressures. The problem with this model is that the random expression of features and then reproduction is an extremely slow process. While including the expression “then add millions of years” appears to be sufficient at first glance to account for such slowness, a truly random process that is this slow will never build anything sufficiently complicated. Humans are notoriously terrible at appreciating exponentials and combinatorics: a deck of cards will likely never be shuffled into the same pattern twice even if billions of people frantically shuffled decks of cards across the planet for a million years. If the core force of evolution is “randomness,” then the probability of repeatedly creating novel stable biological structures such as the liver or the immune system is vanishingly small. Luckily, there is no reason to be stuck in 1800s ways of thinking since we live in the modern information age with advanced digital computers and quantum computers on the horizon. A simple update to natural selection is to acknowledge a domain of algorithms and “Platonic” / mathematical forms that are being carried out in evolution. The creation of a novel organ could arise through the combination of novel algorithms rather than combing “physical” parts in a random manner. However, a core hurdle of digital computer models of life is the need for a programmer. Without a programmer, digital computers are just more random physical elements unlikely to create anything. While we are just at the emergence of quantum computer technology, quantum computers might express a naturally occurring form of computation that does not require explicit programming. Quantum computation at the core of evolution would not be random and would further emphasize the importance of a single processing unit in the organism – the mind. Consciousness as a quantum computer would be critical to the evolution of the species. Your choices and thoughts are the evolution of your body and by extension the human species. Finally, the goal of evolution might not just be the furthering of your life, but if we take human knowledge to actually be real, then using your life to contribute to education, science, and medicine actually makes a difference to the human species. An expanded view of evolution includes expanding the domain of collective human knowledge, the experience of the individual, and the creation of a flourishing society.

In episode 38 of the quantum consciousness series, Justin Riddle takes on the concept of the multiverse and provides arguments for why he thinks we live in a single universe. The concept of the multiverse arose from the recognition that at the fundamental level quantum systems are splitting into different possible futures. This split in space-time reality if taken at face value implies that the universe is splitting into multiple parallel universes in which slightly different events take place. However, quantum mechanics is also faced with a measurement process by which these parallel universes are destroyed and “collapsed” down to a single reality of what actually happens. This duality between a superposition of multiple possible realities and a measurement that reduces the probability space down to a single universe is the fundamental mystery at the heart of quantum mechanics. The tricky bit is that we live in a culture that more readily accepts the multiverse interpretation of quantum mechanics and is hesitant to dive into the murky depths of wave function collapse theories. For example, Roger Penrose describes a mechanism why which wave function collapse occurs at a specific threshold because these parallel universes in possibility space are unstable and collapse. This “objective reduction” theory of wave function collapse is still mostly considered as a fringe and unsubstantiated theory (although the times are slowly changing). To assert the universe and reject the multiverse is to take wave function collapse seriously!

As we enter the quantum information age, society will start to get used to thinking about a digital information state that is chosen as input into a quantum computer, then from this state a wave function evolves and these possible realities interfere with each other. Finally, the system is measured again and digital information is extracted from the system. Computation in the future will be a hybrid of digital and quantum computation in a dualistic interplay. From this perspective, the idea that each of those possibilities is dissociated from each other into a multiverse just does not fit with the idea of interference patterns and quantum computation. If all the suboptimal solutions of a quantum computation are different parallel universe that never interact, then this undermines the concept of quantum computation.

Finally, at the core of the multiverse is the idea that everything is random and nothing happens for a reason. We just happen to be in the universe that worked out despite countless failed universes all around us. This mechanism of action at the core of the idea is a bit too overly simple and reverts into more nihilistic physicalism. From a human outlook, the multiverse is another tenant of nihilism that challenges the idea that your choices matter, you are real, and there is something meaningful occurring in the universe.

In episode 37 of the quantum consciousness series, Justin Riddle takes a deep dive into Donald Hoffman’s conscious agent model and relates it to the leading theories of quantum consciousness. The structure of this episode is an introduction to Hoffman’s model of conscious agents, then an interview with Don Hoffman in November 2022, and finally some reflections on the implications of this model. Hoffman begins by describing the interface theory of perception: we have mistaken the external “physical” world to be fundamental reality. But this external world that we see around us is an evolved interface that was created through billions of years of evolution and cannot be trusted. The world you experience is like a video game – with icons, side quests, and abstract motivations to win victory points. The “real” world is not directly accessible to us through our perceptual systems and there is a great illusion at play. Hoffman then proposes his Conscious Agents theory, in which the universe is comprised of conscious beings interacting with each other. He describes these conscious agents as Markov Chains – probabilistic systems that move through a set of possible experience and action states while learning from their interactions with the world at large. Finally, he proposes that conscious agents are composed of conscious agents resulting in a fractal nested hierarchy of beings from the scale of the entire universe down to the Planck scale. This nested hierarchy is fundamental and now just needs to be mapped into modern particle physics in order to complete his theory of everything. Here, he introduces “decorated permutations” which are a way to map the Markov Models of his conscious agents into geometric structures. With this mapping, he claims to connect his agents to fundamental geometric forms at the core of reality, such as the amplituhedron, and then that amplituhedron can derive space-time, particle physics, and quantum mechanics. His theory is very Platonist in its essence and relies on a geometric depiction of reality. At the end of the episode, I praise the ability of Hoffman’s theory to connect the nested hierarchies of beings into a substrate for mathematical forms to arise, but also caution that his model throws away the physical world and mental world to some degree to focus exclusively on the Platonic world of forms. Living within a hyperdimensional geometric form may result in the same nihilistic conclusions that our lives are just unfolding as sub-projections of this universal form. Can we salvage the human spirit from unmoving crystalline geometry? I hope you enjoy!

In episode 36 of the quantum consciousness series, Justin Riddle describes the popular simulation hypothesis and discusses the implication of running the simulation using quantum computers. First off, Justin makes the argument that the foundation of the simulation hypothesis is strictly based in a digital computer framework. If the world is deterministic and digitizable, then it could in principle be simulated. But, if the world is quantum mechanical – with superposition, measurement, and entanglement – then the world might be non-deterministic or require simulation of the entire universe to capture all the necessary information to make the simulation perfect. Luckily, quantum computer scientists have been working on the concept of simulation for decades. Universal quantum simulation is the theory that if you set up a quantum computer to have the same inputs and the same quantum circuit, then you will get the same probability distribution on different quantum computers. However, when you measure that output, then you get a random digital output drawn from that probability distribution. This means that you can simulate the wave function but measurement fundamentally disrupts the simulation and creates divergence. If you were attempting to simulate a quantum system, then you simulation would start to diverge with each subsequent measurement and by the time you are multiple measurements into the future, reality might be unrecognizably different from the simulation. This massively reduced the controllability and the conclusion is reached that a quantum simulation that fully approximates the world is not sustainable for any substantial amount of time. Second is the problem of scaling. In a digital computer, you can write code that derives a more complicated world from some simple principles. However, in a quantum system, the informational complexity of the system explodes exponentially at every evolution of the wave function. Scientists running quantum simulations of molecular interactions for example are looking to create quantum computers with comparable complexity to those chemical systems in order to simulate them. This is a challenge for the simulation hypothesis because the creator of the simulation would need to have a computer as big as the universe itself in order to run the simulation – there does not appear to be any effective compression techniques for quantum computers. Third, the no-cloning theorem of quantum mechanics states that each wave function is uniquely identifiable and cannot be copied in principle. While the probability distribution of a quantum system can be approximated by other quantum computers, the array of entanglement relationships of a quantum system to the world at large cannot be simulated. This means that any quantum simulation will not be a perfect replication in principle, which could lead to an uncanny valley where the simulation is missing something and appears fake despite attempts to enhance the realism. With all of these metaphysical arguments in mind, there is still a persistent phenomenology of feeling like you are in a simulation. For example, high doses of psychedelic drugs can induce the dissociative feeling that everything around you is fake and this is the first moment of your life. If you were a quantum computer living within a physical brain, then the experience of accessing the data of your brain might be akin to the feeling of living in a simulation. Here you are in the moment collapsing the wave function and entering unique moments of time, but the data you are accessing in your brain contains the narrative construct of your life and knowledge. Hence, a removal of typical “neural access” might create the perception of living in a simulation. Lots to think about in this one! Hope you enjoy

In episode 35 of the Quantum Consciousness series, Justin Riddle explores the role of quantum computers in the current revolution in digital artificial intelligence (AI). First, Justin describes some of the basics of large language models at a high level. In essence, digital AI can be conceptualized as a series of weighted matrices trained by fitting and updating the weights according to patterns found in extensive training sets of data. While these digital AI systems are indeed quite powerful as tools, it is important for us to determine what "knowledge" is being acquired. One option is that there is no universal truth, and meaning is arbitrary. This viewpoint leads to the most significant perceived risk: that this AI might start optimizing for arbitrary values that do not align with human values, the classic example being turning the planet into a massive paperclip factory. This "alignment problem" is what leads people to assert that we need a moratorium or ban on these AI systems.

However, the alternative viewpoint is that there is a universal truth at the core of reality, akin to Plato's world of forms or mathematics. If mathematics is universal, then there are two subsequent outcomes. Either the digital AI can fully map this Platonic world of math, or it can only approximate these forms. Given arguments from Gödel's incompleteness theorem and the residual mystery of quantum mechanics, it is unlikely that digital systems of formal logic will be able to map mathematics fully. Thus, we are left in the middle ground: there is a universal truth, and digital AI is approximating aspects of this universal truth.

The second topic of the episode is the role of quantum computers with respect to digital AI. Justin describes how digital computers represent the ultimate mastery of the physical aspect of reality, while quantum computers are composed of the fundamental pieces of the universe. At the very least, quantum computers will provide an exponential speedup in the training and execution of digital AI, but are also likely to deviate substantially from digital AI because there are additional aspects of their functioning that remain mysterious. How will the digital AI revolution and the quantum revolution compare?

Digital AI will significantly expand our capacity to remember, access, and learn information, but this is a physical tool that will be external to our bodies and minds. However, if the mind is truly a quantum computer, then quantum computer technologies will likely need to be implanted within the nervous system to directly expand the computational capacity of your mind. At the end of the episode, Justin speculates that the expansion of the mind with quantum technology may inadvertently lead to transcendent experiences that defy our current understanding of ourselves and our place in the universe. It sure is an interesting time to be alive on this planet!