T'ai Chi said:
Where do skeptics consider things like:
ideas
information
emotion
thoughts
feelings
sensory input
(can't think of any more)
Can these things be classified as 'matter' or 'non-matter' ?
Is there anything that is non-matter?
Are these things less, as, or more important than things that are matter?
I gotta laugh at questions like this.
I don't know what Skeptics™ decide, but as a person who is fairly well versed in 20th Century physics, I don't even know what matter is.
Take a very simple case: one electron in a hydrogen atom. It has a spin which, when measured, will be either up or down. One could say that the electron is matter, and the spin is information. I think that it is possible to do things to the electron such that, if the spin is up, afterward there is a high probability that the spin willl be down. But I don't know that the spin is a seperate thing from the electron; I don't know that Joe Electron switches its spin or that it is replaced by Fred Electon with the opposite spin; I just think electron number is conserved. But there are plenty of particles whose number is not conserved.
Down one level, and I don't know if there is an electron there. I think that there is an amplitude that an electron is there, and if I assume that an electron is a point particle, I can calculate a probability of finding an electron there. If I stick to the highest probabilities, then they form a fuzzy sphere around the nucleus, and I can calculate that pretty easily. But the sphere is much bigger than the electron would appear if it were not around the proton. So, is there really an electron there, or is there information about the nucleus that there is a certain probability of finding an electron around it?
Furhtermore, this spin of which I speak seems to be related to a thing called angular momentum, which is related to rotational symmetry, which is related to the very existence of another particle.
I'm pretty sure that everything in the universe works basically the same way, because if there were something that didn't work the same way, then all hell would break loose, and this doesn't seem to have happened.
In the absence of a solution to these extremely simple cases, I don't see that it's remotely possible to make a decision about a statement like "information is matter."