It stands to reason that experiences and thoughts in our brain exist physically in the universe. As how would we be able to comprehend them and interact with them if they were imaginary. They are of course brought about by electrical signaling in our neurons. However wouldn't that also suggest the feeling and experience of a thought must also exist physically in the universe? There for, mustn't thoughts be made of matter? And if not, how can something exist in this universe not made of matter, and yet interact with it. Would this be considered a field? A force? I've been contemplating this for a long time.