What is the difference between substance dualism and property dualism?

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What is the difference between substance dualism and property dualism?

Substance dualism and property dualism are two distinct philosophical positions that attempt to address the mind-body problem, which concerns the relationship between the mind and the body. While both positions acknowledge a distinction between the mental and the physical, they differ in their explanations of this distinction.

Substance dualism, also known as Cartesian dualism, was famously proposed by René Descartes. According to substance dualism, the mind and the body are two separate and distinct substances. The mind is a non-physical, thinking substance, while the body is a physical, extended substance. Descartes argued that the mind and the body interact through the pineal gland, which serves as the point of contact between the two substances. This theory suggests that the mind and the body are fundamentally different entities, with the mind being capable of existing independently of the body.

On the other hand, property dualism, also known as non-reductive physicalism, posits that mental properties are distinct from physical properties, but they are not separate substances. Property dualists argue that mental properties, such as thoughts, emotions, and consciousness, are emergent properties of physical processes in the brain. In other words, mental properties arise from the complex organization and functioning of physical matter. Property dualism does not deny the existence of the physical world but emphasizes that mental properties cannot be reduced to or explained solely by physical properties.

The key difference between substance dualism and property dualism lies in their ontological claims. Substance dualism asserts that the mind and the body are two distinct substances, whereas property dualism maintains that mental properties are distinct from physical properties but are not separate substances. Substance dualism implies a dualistic view of reality, suggesting that there are two fundamentally different types of substances, while property dualism allows for a monistic view of reality, acknowledging that mental properties are dependent on physical properties.

Furthermore, substance dualism faces the challenge of explaining how the non-physical mind can interact with the physical body, as it requires a mechanism for this interaction. Property dualism, on the other hand, does not face this challenge since it does not posit a separate substance for the mind. Instead, it focuses on understanding the relationship between mental and physical properties.

In summary, substance dualism posits that the mind and the body are two separate substances, while property dualism argues that mental properties are distinct from physical properties but are not separate substances. Substance dualism implies a dualistic view of reality, while property dualism allows for a monistic view. Both positions attempt to address the mind-body problem, but they offer different explanations for the relationship between the mental and the physical.