Is everything in the universe physical, or is consciousness something entirely different?
In short: Physicalism asserts that reality is fundamentally physical, leaving no room for non-physical substances. Yet, this dominant philosophical view faces persistent challenges, from the mystery of subjective experience to the possibility of philosophical zombies. Can science explain the mind, or is there a gap that physics simply cannot bridge?
Physicalism is the metaphysical doctrine that everything in existence is physical, meaning there is nothing beyond the physical realm. It posits that all phenomena supervene on the physical, such that no mental change can occur without a corresponding physical change. While often used interchangeably with materialism, physicalism is broader, encompassing energy, spacetime, forces, and information as described by modern science. Introduced in the 1930s by Otto Neurath and Rudolf Carnap, it remains the majority view among philosophers, held by 51.9% according to the 2020 PhilPapers Survey.
The debate often centers on whether mental states are reducible to physical ones. Type physicalism suggests mental states like pain correlate directly with physical events like C-fiber firings, but critics point to multiple realizability—the idea that the same mental state could be produced by different physical systems. Non-reductive physicalists attempt to avoid this by arguing that while mental states are physical, they are not strictly reducible to physics. However, philosophers like Jaegwon Kim argue this leads to causal overdetermination, forcing a choice between reductionism or epiphenomenalism, where mental states have no causal power.
The most famous objections involve the 'hard problem' of consciousness. Frank Jackson’s 'Mary’s room' thought experiment argues that knowing every physical fact about color does not equate to the experience of seeing it, suggesting physicalism misses something essential. Similarly, the 'zombie argument' posits that we can conceive of a world physically identical to ours but lacking consciousness, which would imply physicalism is false. Some, like Galen Strawson, argue that 'real' physicalism must actually embrace panpsychism, suggesting that experience is an intrinsic feature of physical ultimates, rather than something that emerges from non-experiential matter.
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- Summary by Intellect · source: Physicalism
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