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17 theories

Neutral Monism: theories of consciousness

Reality is made of one basic kind of stuff that is neither mental nor physical. Mind and matter are two aspects, or two constructions, of that single neutral base.

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Neutral monism agrees with materialism and idealism that reality is built from one kind of stuff. It disagrees about what that stuff is. The base is neutral, and the mental and the physical are both organizations or aspects of it. This promises to avoid the interaction problem of dualism, the trouble materialism has with experience, and the trouble idealism has explaining how one cosmic mind divides into many.

The classic versions come from William James, who called the neutral stuff ‘pure experience’, and Bertrand Russell, whose ideas lie behind today’s Russellian monism. Ernst Mach built a similar picture out of sensations. Dual-aspect theories make the same move in another form. Spinoza described one substance known under the attributes of thought and extension, and the physicist Wolfgang Pauli, with Carl Jung, treated the mental and the physical as complementary aspects of one reality, an idea Harald Atmanspacher develops today.

The family is broad. It includes Max Velmans’s reflexive monism, Galen Strawson’s realistic monism, Max Tegmark’s proposal that consciousness is a state of matter defined by how it processes information, and the Qualia Research Institute’s attempt to give experience a precise mathematical formalism. Leibniz and Davidson are borderline members. Leibniz’s monads are mental and Davidson’s base is physical, yet each treats the mental and the physical as two coordinated descriptions of one order.

The weak point is the neutral base itself. Its defenders say little about what it is like in itself, and if it has experiential qualities, the view slides toward panpsychism, which differs mainly in calling the base mind-like from the start.

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