Hallucination and Truth. Whoever this Fumerton is they sound rather silly or you are misrepresenting their point … whatever it is.
If I see a table in front of me I do not question it as a table. If my hand goes through the table then I understand I am hallucinating. If I believe I can put my hand through a table when everyone else around me says there is no table there that is a delusion. If I see a rainbow in the sky it is an optical illusion.
The idea that we can ‘know’ in some absolute sense is clearly ridiculous and why I said it sounds rather silly. We do not look at every object in day-to-day life and question its existence. Anything brought into conscious attention can be readily questioned with some degree of skepticism.
Maybe he was asking how we regulate our skepticism and get on in the world rather than being constantly constipated with doubt about everything? That can fairly easily be accounted for through neuroscientific studies, that show how we are novelty seeking beings. What is ‘ordinary’ is roughly categorised as ‘existing’ and not worthy of any high degree of skeptical attention - unless it errs from normal experience in its appearance in some way. This is why when we walk into a room in our house we tend to notice if there is a chair overturned, yet on a junk site an overturned chair will unlikely draw our attention as it is something we are likely to see.
As for studies where people have taken hallucinogens there are reports that such experiences feel ‘more real than real’ and we could perhaps put this down to a novelty overload of sorts. Things that grip us so profoundly open up our perceptual doors and allow for the comparative drudgery of day-to-day life to spring into a newfound light and gain potentially more meaning along side the novelty of the experience.
I imagine a few people here have experienced something quite extraordinary in life that made the whole world around them look/feel somehow ‘different’ and ‘more new’.