Originally posted by Soljer
Nope, because it's not meant to validate their absolute existence, nor the existence of their hallucinations. Just THEIR existence.My friend, you've missed the point here. It doesn't matter if the hallucination or dream is real - what matters is that you can experience it.
"I think, therefore I am", as I have said, requires base assumptions which were not proved by Descartes, and which you have not addressed either. The first is the presumption that activity without an agent is possible, and that introspection holds no distinct object to serve as the abse for Cartesian self-awareness.
I didn't really want to drag this into a philosophy argument, so let me just point out the flaws in simply saying that one must exist because one thinks. I have already listed one assumption, but let me list a few more, many of which were not disputed by supporters of the cogito:
1) That it is I who thinks.
2) That there must be something that thinks
3) That thinking is an activity and an operation on the part of a being that it assumed to be a cause.
4) That there is an "ego"
5) That it is already determined what is to be designated by thinking - that one knows what thinking is.
Go ahead and work it out.