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I believe you are confusing consciousness with measurement. A favorite pass time of quantum mechanics. The double slit experiment outcome has nothing to do with consciousness in the experimental sense of the word. When the measuring device is turned on then the wave pattern no longer appears but the particle appears in one spot or the other. There could have just as well been a timer turning on the measuring device while you were not in the room and the same thing would have happened. That being said consciousness does enter the picture but in a very subtle and unexpected place. Free will is usually tied to consciousness and if you don't believe in free will then there is no enigma because you could argue the universe conspired to set up the results knowing what your action was going to be. BUT if you believe in free will that the quantum enigma exists in the sense of the type measurement will predict a wave or a particle outcome. This is were consciousness meets QM.