But in this case the brain's understanding is based on observation of the world external to the self, and supernatural beings by definition aren't found in nature. So reality is free of supernatural beings not only via observation but in principle.
I don't understand what you mean by "metaphysics" in this context.
...
That is magical thinking. Here is how. You think the world is natural. That is what you do, when you define the world as being natural. But that you define it so, won't cause it to be natural.
So we are playing what the world is to you as per your experiences versus independent of your experiences(metaphysics) and apparently you are functionally unable to understand the difference.
So here it is for 2 different natural world, where the worlds as independent of your experiences are different.
A real world versus a Boltzmann Brain universe physically consisting of some space, a computer and a powersource. On the computer is a simulation of the universe and you running as subroutine. I don't exist as me and your definition doesn't change anything as to what the world is as independent of your experience of it.
This example with a Boltzmann Brain universe can be formalized in a more general sense:
- A real world causes you to have your experiences.
- A non-real world causes you to have your experiences.
Ah, so you're a solipsist changing your world with the power of imagination.
And you've imagined me out. you say?
Then I guess you won't find me there.
Now my above example are not metaphysical/ontological solipsism. They are epistemological skepticism for what knowledge is and how to understand your magical thinking by believing the world is natural, because you define it so.
NOW LISTEN!!! I am not a solipsist and that you are unable to understand that, is your problem and not mine.
I am a skeptic. I check my own thinking and other humans' thinking and you can't think the world to be natural by defining the world to be natural. That is a case of magical thinking, because it means that your thinking is what causes the world to be natural.
That you are like some other people and unable to understand the difference between solipsism and skepticism as for knowledge, is not my problem.
In effect you seem unable to understand the difference, so reduction ad absurdum I use your magical thinking on you. You don't exist, because I define you to be non-existence. You won't accept that, because you know, that is not how thinking works. But you believe that your thinking as your definition of what the world is, decides what the world is. It doesn't!