The mind-brain interaction problem—how a subjective, immaterial mind can interact with an objective, material brain—may be resolved through quantum mechanics, specifically biological entanglement and nonlocality. Analysis of recent experiments suggests that quantum effects could explain how mental events initiate neural events, enable transference of conscious subjective experience, and address the measurement problem and the binding problem. Ongoing and proposed experiments may further clarify these connections.
An analysis of von Neumann, London and Bauer, and Wigner's theories on consciousness collapsing the wave function suggests they may have erred in calling for reduction of superposition states in the brain. Wigner later adopted a simpler objective position, expanded by Shimony, which offers a resolution. The argument holds that the wave function of superposed photon states is objectively changed within the eye's architecture: first a continuous linear process for most photons, then a discontinuous nonlinear collapse for any remaining, ensuring only final measured information reaches the brain. A future experiment may resolve the measurement problem and test if quantum mechanics' linearity is violated by perception.