osgart
Nothing my eye, Something for sure
If someone who hallucinates could test the hallucination they might find that it doesn't corroborate physically with the other senses and thus know it's a real illusion.Yeah, you like logic and reason. Now with logic and reason alone solve the following problem.
You know that a brain can produce a hallucination and you know according to your worldview that it is natural.
In effect the universe causes you to experience something that is not real or true.
So here is the formal problem: If that is true and you can't deny it, because then you deny that the universe is natural and real, because you in effect some unnatural and unreal is caused by the universe, thus it is true and real, that the universe in effect can trick you.
So how do you know that is not happening now? Well, you can't because you then assume that which you question. You question if your experiences are real and true and thus you can't start by assuming that they are, because then you have done a circular argument.
So here it is for the 2 possibilities:
The universe causes you to have experiences that are not real and true.
The universe causes you to have experiences that are real and true.
It comes in many variants: Descartes. A brain in a vat. The computer simulation. A Boltzmann Brain.
The same problem is here on a different scale:
"The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the universe which we can see is a fair sample, and that the same physical laws apply throughout. In essence, this in a sense says that the universe is knowable and is playing fair with scientists."
William C. Keel (2007). The Road to Galaxy Formation (2nd ed.). Springer-Praxis. p. 2. ISBN 978-3-540-72534-3.
And thus you get this in the Wiki article about science:
"All scientific study inescapably builds on at least some essential assumptions that are untested by scientific processes.[43][44] Kuhn concurs that all science is based on an approved agenda of unprovable assumptions about the character of the universe, rather than merely on empirical facts. These assumptions—a paradigm—comprise a collection of beliefs, values and techniques that are held by a given scientific community, which legitimize their systems and set the limitations to their investigation.[45] For naturalists, nature is the only reality, the only paradigm. There is no such thing as 'supernatural'. The scientific method is to be used to investigate all reality,[46] and Naturalism is the implicit philosophy of working scientists.[47]"
Philosophy of science - Wikipedia
en.wikipedia.org
I am just honest. I don't know that the universe is real. I have faith in that.
Same goes for dreams. In my mind's eye I can see images produced and as my mind reacts I seem to be able to exert some control over the actions in my dream. I have imagery responses to the images that happen in my mind. They are somewhat nonsensical occurrences.
Even now I can imagine the checkout counter at the grocery store I was just at in my mind. I know it's real because I've been there so many times physically.
All senses should corroborate that I'm actually experiencing an actual reality vs. an imaginary one.
To some extent the hallucination is real it's just not in the same category of real as the actual physical world.
Hallucinations, dreams, and imaginations are separate realities from the physical actuality.
So it's all real, just in totally different ways.
To me one sense should corroborate with all other senses to know I have actuality.
Of course my niece may actually be a purple dragon appearing as my niece, but I don't buy it.
Then there is the topic of pain. Pain that can't be wished away.
I would say everything is real, but there are different categories of real.