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The controversial and unproven hypothesis that classical physics cannot explain consciousness, and that quantum mechanical processes within neurons (e.g., in microtubules) are the source of subjective experience. Proponents argue this could explain the non-algorithmic nature of thought and free will. Critics dismiss it as wishful thinking. More philosophically, it can refer to the idea that consciousness itself has quantum-like properties: being both particulate and wavelike, being changed by observation, and existing in a potential state until collapsed by interaction.
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