In what ways do perceptions (what we see) and images (what we imagine) differ? Is a hallucination an image or a perception? How about a dream? Bob

I'm not quite ready to accept your terminology, but will try to respond in spite of that. I think the most obvious difference between ordinary perception and things like hallucinations and dreams is that the former sorts of experiences are reasonably assumed to be verific (that is, to tell us something true about the world), whereas the others are not verific, or at least are only very unreliably so. The fact that I dream that such and such is the case (assuming I have no reason to think that I am some kind of dream clairvoyant) is of course compatible with it really being the case...but gives me no grounds for believing that it really is the case. The fact that I perceive something to be the case does give me grounds for believing that it is the case. I am not claiming, of course, that perception is infallible, for it plainly is not. What I am claiming is that there is evidenciary value in perception that is lacking in hallucination, fantasy, dreaming, and other such experiences.

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