Key Moments
Can Evolution Explain Consciousness and Reason? | Thomas Nagel
Closer To TruthKey Moments
Evolutionary materialism struggles to explain consciousness and objective value, suggesting a fundamental aspect of reality might be inherently proto-conscious or teleological.
Key Insights
The evolutionary explanation of mind fails to account for consciousness and objective value, suggesting that our capacity for reason and ethics might not be mere byproducts of survival.
Objective value and ethics are presented as being on par with consciousness in terms of their explanatory challenge, as reducing them to subjective feelings or evolutionary advantages is seen as inadequate.
Sharon Street's argument linking subjective value to evolution is acknowledged, but Nagel reverses it, suggesting that objective moral truths might challenge neo-Darwinian evolutionary accounts.
The potential for teleology (purpose or goal-directedness) in the universe's development is considered, not as a religious concept, but as a potentially fundamental aspect of reality that science should not pre-emptively dismiss.
Nagel, an atheist, expresses a personal desire for there to be no God, not out of spite, but due to a wish for human autonomy and privacy from divine oversight.
The fundamental nature of reality might be neither purely mental nor purely physical, but something deeper that manifests as both, implying that consciousness or its potential was present from the universe's inception.
The inadequacy of evolutionary materialism for consciousness and value
Thomas Nagel revisits his arguments in "Mind and Cosmos," challenging the prevailing view of evolutionary materialism, which posits that complex phenomena like consciousness, rationality, and objective value can be fully explained by material processes and evolutionary history. He contends that this framework, while useful for understanding the mechanistic "how" of biological development, fails to adequately address the "what" and "why" of subjective experience and our sense of objective moral truths. The emergence of consciousness from a soulless, material universe, starting from a "quark soup," presents a profound mystery that evolutionary accounts struggle to resolve. Furthermore, the existence of objective value and the basis of ethics and reasons for action are presented as equally significant challenges, resisting reduction to mere subjective feelings or evolutionary adaptations for survival. Nagel argues that attempts to explain value judgments as purely expressive or culturally relative are ultimately unconvincing, implying that our moral intuitions point towards a reality where such values hold objective weight.
Objective value as a core philosophical challenge
Nagel elevates the problem of objective value to a status comparable to the mind-body problem. He argues that the debate hinges on whether certain phenomena or facts are intrinsic and can be understood outside of reductionist explanations. While acknowledging the persistent debate between moral realists and subjectivists/expressivists, Nagel finds attempts to reduce value judgments to mere expressions of feeling or adherence to traditions unsatisfactory. He uses a Socratic approach, questioning whether an individual truly believes that an act like torture would not be wrong if they simply did not *feel* it was wrong. This highlights the core issue: can value judgments be exhaustively explained through reductionist lenses, or do they point to a deeper, objective reality?
Reversing the evolutionary account of value
The video discusses Sharon Street's argument, which suggests that the subjective nature of morality arises from evolutionary pressures. Street posits that evolution would naturally produce agents with certain values, making those values inherently subjective. Nagel agrees with the linkage Street draws between evolution and value but reverses the direction of causality. He suggests that if one starts with a commitment to moral realism—the belief in objective moral truths—then this very commitment poses a challenge to a straightforward neo-Darwinian evolutionary explanation. If objective moral facts exist, then our evolutionary history must somehow account for our capacity to apprehend them, rather than simply generating subjective preferences that aid survival. This perspective implies that our rational and moral faculties might be attuned to an objective reality that evolutionary materialism struggles to accommodate.
Rationality and the limits of evolutionary explanation
Similar to the problem of consciousness and value, Nagel argues that evolutionary explanations also fall short when it comes to rationality. If rationality is understood as a connection to objective truth, then an evolutionary account that explains our thinking habits solely in terms of their survival value, rather than their capacity to track reality, becomes problematic. This echoes Alvin Plantinga's evolutionary argument against naturalism, which suggests that adopting an evolutionary worldview can lead to self-contradiction regarding the reliability of the very reasoning faculties used to arrive at that worldview. While Nagel agrees with the critique, he diverges from Plantinga by seeking a more fundamental aspect of our relationship with the universe to explain our rational capacities, rather than solely focusing on the internal consistency of naturalism.
The possibility of teleology and purpose
The discussion touches upon teleology, or the idea of purpose and goal-directedness in the universe. While historically a contentious concept in science, Nagel notes its increasing, albeit qualified, use in fields like biology, often interpreted as explanatory rather than faith-based. He finds the idea that the universe's development, including the emergence of life and consciousness, might be inherently purposeful or directed towards greater complexity to be a plausible consideration. This is not presented as a religious argument but as a potential, albeit unfashionable, mode of explanation that science should not dismiss. John Leslie's view, where value is seen as the fundamental generative cause of the universe, is mentioned as an example of this direction of thought, suggesting that purpose might be more fundamental than even existence or divinity.
Personal stance on belief and the desire for non-existence of God
Nagel, an avowed atheist with no religious inclinations, shares a personal sentiment about belief: he not only believes there is no God but also hopes it is true. He elaborates that he "doesn't want the universe to be that way," citing a desire for human privacy and autonomy from divine oversight. This personal perspective contrasts with the usual arguments against God's existence, framing it as a preference for a universe where humanity's affairs are not subject to external divine judgment or knowledge. He likens this to Marvin Minsky's reason for not wanting a God, which stemmed from a desire to claim credit for his own intellectual achievements. While acknowledging that a divine creator could be a source of ultimate purpose, Nagel's personal hope lies in a universe where human existence is self-contained and private.
Seeking a unified, non-reductive understanding of reality
Nagel's project aims to find an alternative to both reductive materialism and religious faith, one that acknowledges the reality of the mind-body problem and the objectivity of value and reason. He suggests that the fundamental constituents of reality might possess inherent proto-conscious or proto-rational properties. This implies that consciousness, or the potential for it, was present from the universe's inception, embedded within the basic elements of matter. Such a view would propose a form of monism where the underlying reality is neither purely mental nor purely physical but something deeper that manifests as both. This deeper reality would explain how complex structures like brains, when assembled correctly, can give rise to subjective human experiences.
Pondering fundamental reality: panpsychism or neutral monism
The discussion explores two speculative paths toward a unified theory: panpsychism (where consciousness or its precursors are fundamental to all matter) and neutral monism (where a single underlying reality manifests as both mind and matter). Nagel acknowledges that currently, there is no definitive way to distinguish between these models. However, he emphasizes that contemplating these possibilities is crucial for scientific and philosophical progress, as it broadens our conceptual landscape. The core idea is that the relationship between mind and matter at all levels might not be accidental but indicative of a deeper unity. This fundamental reality, neither mental nor physical, would be the true ground of existence, manifesting in the diverse phenomena we observe. This philosophical speculation, Nagel believes, is an essential part of the scientific endeavor, offering potential frameworks for future investigation.
Mentioned in This Episode
●Books
●Concepts
●People Referenced
Common Questions
Nagel's book examines consciousness, perception, reason, and value through two lenses: a "how-it-happens" (constitution) approach and a "how-it-came-to-be" (evolutionary history) approach, arguing that both are necessary for a complete understanding.
Topics
Mentioned in this video
The view that consciousness, or proto-consciousness, is a fundamental and ubiquitous feature of reality.
A viewpoint that life and the universe are best explained by an intelligent cause, not an undirected process such as natural selection. Nagel's work is sometimes invoked to support it, though he is an atheist.
A metaphysical view that reality is composed of only one fundamental kind of substance or principle, which is neither mental nor physical but can manifest as both.
Philosopher discussing his book 'Mind and Cosmos' and its implications for understanding consciousness, reason, and value.
Philosopher whose arguments about the subjective value of morality based on evolution are discussed.
Philosopher whose evolutionary argument against naturalism, suggesting a self-contradiction in using the mind to deduce evolutionary truths, is mentioned.
Philosopher who posits value as the fundamental generative cause of the universe, even more important than God.
A renowned atheist and AI pioneer who shared his personal reason for not wanting a God: to claim credit for his own intellectual work.
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