Is Property Dualism a Convincing Theory of Mind?
I will conclude that property dualism is unconvincing. While it avoids some of the pitfalls of substance dualism, its core arguments (Zombies and Mary) fail to overcome the physicalist's distinction between concepts and facts, and logical versus metaphysical possibility
- Property dualism is the view that although only one physical substance exists (the brain), it possesses non-physical properties (qualia) that are neither reducible to nor supervenient on physical properties - Unlike substance dualism, property dualism accepts that the mind depends on the brain but denies that this dependence is a full physical reduction. It addresses Chalmers’ 'Hard Problem' of consciousness: why physical processes in the brain give rise to subjective experience - I will evaluate two major arguments for property dualism: Chalmers’ Zombie Argument and Jackson’s Knowledge Argument. I will argue that both fail because they rely on the faulty assumption that our internal conceptions must dictate external reality
Section 1: The Zombie Argument (Chalmers)
- The most effective counter is to deny that conceivability entails metaphysical possibility. The water/H2O analogy is decisive here: it demonstrates that we can imagine a 'confusion' (water without H2O) without it being a real possibility - Furthermore, the zombie argument can be accused of 'begging the question'. If physicalism is true, a zombie is a contradiction (like a 4-sided triangle). One can only clearly conceive of a zombie by first assuming that consciousness is distinct from the physical
David Chalmers: The Zombie Argument
- Chalmers argues that physicalism implies it is impossible for a full physical duplicate of a human to exist without consciousness. However, we can conceive of 'philosophical zombies': - P1. Philosophical zombies (physical duplicates without qualia) are conceivable - P2. What is conceivable is metaphysically possible - P3. If zombies are possible, then phenomenal properties are not reducible to physical ones - C. Therefore, property dualism is true - Chalmers argues that because there's no self-contradiction in the concept of a zombie, it must be logically possible, which undermines the physicalist claim of identity
: The Water/H2O Counter
- Physicalists argue that identity is a metaphysical necessity. Before the discovery of chemistry, people could conceive of water not being H2O, but that didn't make it possible - If the mind is identical to the brain, then a zombie is as impossible as water being XYZ. The fact that it 'feels' conceivable is just a result of our ignorance of the specific identities involved
Section 2: The Knowledge Argument (Mary)
- The 'New Knowledge/Old Fact' response is the strongest rebuttal. It allows that Mary learns something, but denies that what she learns is a new part of reality. She merely acquires a first-person concepts for a third-person fact she already knew - The 'Ability Knowledge' response is also useful but less comprehensive, as it's hard to deny that Mary 'knows more' about the world (propositional knowledge) after seeing red for the first time
Frank Jackson: The Knowledge Argument (Mary)
- Jackson presents the thought experiment of Mary, a scientist who knows all physical facts about color but has never seen red: - P1. Mary knows all physical facts about red - P2. Upon seeing red, she learns something new (what it is like to see red) - C1. Therefore, there is knowledge beyond physical facts - C2. Therefore, physicalism is false and property dualism is true - This argument suggests that qualia are non-physical properties that escape even the most complete physical description
: New Knowledge, Old Fact Response
- This response argues that Mary gains new propositional knowledge, but not knowledge of a new fact. Instead, she learns a new 'phenomenal concept' for a physical fact she already knew via 'physical concepts' - This is like Lois Lane knowing Superman can fly but not knowing Clark Kent can fly. She doesn't learn a new fact about the world when she finds out they are the same person; she just links two concepts to the same entity. Mary does the same for the brain process and the experience of red
- Property dualism is the strongest form of dualism because it acknowledges the physical substrate of the mind while preserving the unique character of qualia. However, strength in intuition does not translate to logical soundness - The Zombie argument fails because the water/H2O analogy proves that we cannot infer metaphysical possibility from mere logical conceivability. To insist otherwise assumes dualism is true from the start - The Mary argument fails because 'knowledge of a new concept' does not imply 'knowledge of a new fact'. Mary gains a psychological way of thinking about an old physical fact (the brain process), which is perfectly consistent with physicalism - Therefore, property dualism remains a speculative theory that lacks the rigorous support needed to overturn a physicalist worldview