According to the Many Minds interpretation of quantum mechanics (https://en.wikipedia.org/wiki/Many-minds_interpretation), the distinction between worlds in the Many Worlds interpretation should be made at the level of the mind of an individual observer. I have read that, in this case, each observer's mental states would be realized in at least one universe. According to the Many Minds interpretation all that matters is the mind and its mental states

When I found about this interpretation I though it was interesting, although I know it has no empirical support yet. But then I thought of something strange that I think would happen if this interpretation was true and I do not know if my idea is correct.

The thing is: When we observe something (e.g. an apple), a set of neurons are activated and they form a mental state representing the observation of that apple. People with mental illnesses (such as schizophrenia) tend to visualize things that do not really exist (for example, if a patient visualizes a monster, the mental states that would correspond to the observation of that monster are activated. Even if the monster does not exist, the mental states corresponding to that observation are activated, and therefore, the patient would really believe that there is a monster in front of it, since that "observation" would be indistinguishable from an observation of an actual thing)

Therefore, if Many-Minds considers that the observer is fundamental and that mental states corresponding to different observations are realized in different universes, then, would a schizophrenic patient's hallucinations actually exist in different universes? I mean, if this interpretation considers that the different mental states corresponding to what we observe actually indicates what is real, then, if a person suffers hallucinations, wouldn't it meant that these "observations" of those illusions could exist in different universes? That when a schizophrenic patient "sees" a monster, that monster could actually exist in some universe (since it corresponds to a mental state of an "observation")?


This is why the many worlds hypothesis gets the “blank stare response”. Sit for a while and think of all the absurd possibilities that would exist. Anything you can get think of really exists in some universe. Every movie ever made actually happens for real in some universe. There might be a universe where everyone on earth stands up all at once and starts screaming and running around, ripping their clothes off, killing people, etc. States of eternal agony, injustice, and totally evil, hell. Universes where you murder your whole family for no apparent reason. Monsters. Superheroes. They all exist in the other universes. Universes where it just so happens that you are some kind of mutant who doesn’t grow old or die. Universes where I win the powerball every time I play. The absurdities are endless.

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