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How is materialism different from mind-body dualism?

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Bronze bust of Epicurus with a full beard and draped clothing, displayed on a round inscribed base at the National Archaeological Museum of Naples. — Materialism Epicurus, bronze bust from a Greek original, c. 280–270 bce; in the Museo Archeologico Nazionale, Naples.

Materialism and mind-body dualism represent fundamentally different approaches to the nature of reality and the relationship between mental and physical phenomena.

Materialism is the metaphysical view that all facts—including those concerning the human mind and will—are causally dependent upon or reducible to physical processes. Materialists generally seek to explain mental events within a unified scientific framework, often identifying mental states with brain states or behavioral dispositions to avoid the need for irreducible "mental" entities.123

In contrast, mind-body dualism posits that the mind and body are fundamentally distinct kinds of substances or natures. While materialists argue that mental properties are determined by or identical to physical ones, dualists maintain that the mental is not merely a physical byproduct.45

Key differences include:
* Substance: Dualists (specifically substance dualists) argue the mind is an immaterial, nonextended substance, whereas materialists reject the existence of such nonphysical "stuff".4
* Causality: Dualism often struggles with the "mind-body problem"—explaining how an immaterial mind can causally interact with a physical body. Materialism avoids this by asserting that all causal chains are physical.4512
* Reductionism: Materialism aims to reduce mental phenomena to physical mechanisms, while dualism insists on the irreducibility of the mental.12