Consciousness and Quantum Mechanics: How are they related?

The discussion revolves around the controversial role of consciousness in quantum mechanics, particularly focusing on interpretations by physicists like von Neumann and Wigner. They believed consciousness is necessary to make sense of quantum phenomena, particularly the collapse of wave-functions, where a quantum state shifts from multiple possibilities to a single observed state. The text explains the Wigner's friend experiment and von Neumann's chain of superpositions, which propose that the observer's consciousness is the deciding factor in the collapse. However, these interpretations haven't gained wide acceptance due to their complexity and the undefined nature of consciousness. The text further explores a new proposal by philosophers David Chalmers and Kelvin MacQueen, which modifies quantum mechanics and uses the Integrated Information Theory to measure consciousness. Finally, the discussion criticizes experiments that claim consciousness can influence the collapse of wave-function, explaining that the results are disputed and not reproducible. It also briefly touches upon the Penrose and Hamaroff's theory, which reverses the assumption and suggests the collapse of the wave-function leads to consciousness.