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CRC Press eBooks

Consciousness in quantum physics

Danko Dimchev Georgiev

Published Dec 6, 2017• 0 citations
Publisher

Abstract

Quantum physics provides a good candidate for a mathematical entity, namely, the quantum state vector in the Hilbert space. The causal potency problem originates from determinism: In classical physical theories there are fundamental constituents entering in the mathematical description of the physical laws that govern deterministically the dynamics of physical systems. Since only these fundamental constituents are causally potent to affect the deterministic behavior of physical systems, consciousness has to appear as a fundamental constituent of the physical theory as well. Existentialism clashes seriously with determinism. Classical deterministic physics allows no free will and no objective morality. Classically, functionalism leads to epiphenomenalism because the generated conscious experiences are unable to change the already predetermined future dynamics of the brain. In quantum physics, however, the quantum indeterminism in the dynamics of quantum systems provides a multitude of possible outcomes from the measurement process.

DOI
10.1201/9780203732519-6

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Quantum physics provides a good candidate for a mathematical entity, namely, the quantum state vector in the Hilbert space. The causal potency problem originates from determinism: In classical physical theories there are fundamental constituents entering in the mathematical description of the physical laws that govern deterministically the dynamics of physical systems. Since only these fundamental constituents are causally potent to affect the deterministic behavior of physical systems, consciousness has to appear as a fundamental constituent of the physical theory as well. Existentialism clashes seriously with determinism. Classical deterministic physics allows no free will and no objective morality. Classically, functionalism leads to epiphenomenalism because the generated conscious experiences are unable to change the already predetermined future dynamics of the brain. In quantum physics, however, the quantum indeterminism in the dynamics of quantum systems provides a multitude of possible outcomes from the measurement process.
The evolution of the human mind through natural selection mandates that our conscious experiences are causally potent in order to leave a tangible impact on the surrounding physical world. Any attempt to construct a functional theory of the conscious mind within the framework of classical physics, however, inevitably leads to causally impotent conscious experiences in direct contradiction to evolution theory. Here, we derive several rigorous theorems that identify the origin of the latter impasse in the mathematical properties of ordinary differential equations employed in combination with the alleged functional production of the mind by the brain. Then, we demonstrate that a mind–brain theory consistent with causally potent conscious experiences is provided by modern quantum physics, in which the unobservable conscious mind is reductively identified with the quantum state of the brain and the observable brain is constructed by the physical measurement of quantum brain observables. The resulting quantum stochastic dynamics obtained from sequential quantum measurements of the brain is governed by stochastic differential equations, which permit genuine free will exercised through sequential conscious choices of future courses of action. Thus, quantum reductionism provides a solid theoretical foundation for the causal potency of consciousness, free will and cultural transmission.
The natural evolution of consciousness in different animal species mandates that conscious experiences are causally potent in order to confer any advantage in the struggle for survival. Any endeavor to construct a physical theory of consciousness based on emergence within the framework of classical physics, however, leads to causally impotent conscious experiences in direct contradiction to evolutionary theory since epiphenomenal consciousness cannot evolve through natural selection. Here, we review recent theoretical advances in describing sentience and free will as fundamental aspects of reality granted by quantum physical laws. Modern quantum information theory considers quantum states as a physical resource that endows quantum systems with the capacity to perform physical tasks that are classically impossible. Reductive identification of conscious experiences with the quantum information comprised in quantum brain states allows for causally potent consciousness that is capable of performing genuine choices for future courses of physical action. The consequent evolution of brain cortical networks contributes to increased computational power, memory capacity, and cognitive intelligence of the living organisms.
The nature and idea of consciousness is very mysterious and has profound importance, with existential, medical and spiritual implications and productivity. Behavior and functioning of the brain or, in other words, material brain activity is in some way correlated to the consciousness or mental activity. Since it is the most fundamental theory about the matter that is currently available, in efforts to understand the consciousness we can assume that the Quantum theory can be helpful. Various steps and studies have been carried out to achieve the extent of relation of quantum theory to the different neurophysiological levels of descriptions. In past and in current scenario efforts have been made to adopt quantum theory in different ways that correlate it to consciousness. The concept that this is solely a quantum effect and does not work for a classical case is also discussed. Researchers studied this about the notorious puzzles and contradiction of quantum mechanics, the theory physicists use to describe the tiniest objects in the Universe.
Quantum theory is open to different interpretations, and this paper reviews some of the points of contention. The standard interpretation of quantum physics assumes that the quantum world is characterized by absolute indeterminism and that quantum systems exist objectively only when they are being measured or observed. David Bohm's ontological interpretation of quantum theory rejects both these assumptions. Bohm's theory that quantum events are party determined by subtler forces operating at deeper levels of reality ties in with John Eccles ' theory that our minds exist outside the material world and interact with our brains at the quantum level. Paranormal phenomena indicate that our minds can communicate with other minds and affect distant physical systems by nonordinary means. Whether such phenomena can be adequately explained in terms of nonlocality and the quantum vacuum or whether they involve superphysical forces and states of matter as yet unknown to science is still an open question, and one which merits further experimental study.
Science is learning more about the brain activity necessary for consciousness, but has not identified any mechanisms for how it could actually arise through neural processes. Here I present ways to build consciousness into the mathematics of quantum mechanics for use in the growing area of quantum neurology. Quantum waves are not physical in the sense of forces acting on particles through cause and effect, and they are expressed using mathematical placeholders that do not have agreed-upon real-world representations. These can be used to represent consciousness. Quantum mechanics has shown how the traditional aspects of the physical world emerge from non-physical quantum information through a combination of mathematical, not causal, determinism, and stochastic interactions. The modeling methods here could help account for how the mental world could also emerge from information fields. Neural interactions for mental experiences are complex, so it is reasonable to expect that consciousness is an emergent property of neural networks. But emergent properties are not magic – they work through procedural mechanisms – in this case for how neural processes generate experiences. No steps for how consciousness could be manufactured in this way are apparent, and philosophers have strong arguments for such not being possible. An alternative is to model consciousness as part of quantum waves, so it is accessed, not created, by the brain. This is a form of neutral monism – the idea that the physical and mental worlds both come from a single underlying source – in this case quantum waves. The classical physical picture of particles and forces acting under cause and effect has developed into a belief system, not just a theory, and this has created difficulties in taking quantum mechanics itself at face value. The result has been the creation of numerous “interpretations” of quantum mechanics that seek to frame it within these philosophical presuppositions. The conceptual framework of Cartesian dualism provides a platform for analysis of the related philosophical issues of consciousness and of quantum mechanics itself.
In recent decades, progress in the field of neurosciences has triggered an interest in understanding mind-brain relationships. Quantum Mechanics (QM) has been present in the debate from its beginnings through the well-known measurement paradox. The standard interpretation of QM considers two basic, fundamentally irreducible, processes: the deterministic evolution of the wave-function according to the Schrodinger equation, once the initial conditions have been settled; and the indeterministic wave-function collapse into one of the possible outcomes, after performing a specific measurement. So, QM would point to the limits of a purely deterministic view of nature and, in particular, of brains. Nevertheless, QM’s relevance for the brain’s physics is still to be proven. Detractors of the QM influence are confident of the role of decoherent processes at different physical scales in order to ensure a classical deterministic behavior of the brain. However, little attention is paid to the epistemic implications of invoking decoherence for the mind-brain problem. In this paper, (i) we present lasting QM models stating a specific view of human consciousness and make explicit their position regarding the relationship between the physical activity of neurons and/or networks of neurons and the phenomenal conscious experience; (ii) we review the main criticisms of the relevance of QM in the brain and, most importantly, we bring out the philosophical implications behind the usual recourse to decoherence in the transition from the quantum to the classical world, explaining why the mind-brain problem and the measurement paradox should not be disentangled.