[From Rick Marken (2006.08.29.0825)]
Bill Powers (2006.08.29.0715 MDT)--
The movers arrive today.
Oy. Good luck. I hope it goes smoothly.
Rick Marken (2006.08.28.1600) --
OK. I think we can all agree that perception is reality and reality is the current state of our scientific models.
Why am I not happy with that?
Because I was waxing poetic. What I should have said is "perception is what we take to be reality while the best we can do at knowing the nature of the presumed external reality that is the basis of our perception is to build scientifically tested models of that reality" .
Ah, same reason I give for determining what is an illusion: Things which are equal to the same thing (or each other) are equal to each other
Could you expand on that a little? How does that apply to common visual illusions, like the Necker cube, Muller Lyer (<--> >--<), stick bent in water, etc.
Directly Perceived Reality is the part of Real Reality that can be experienced. Experience can't be denied. If you see a pink elephant in the corner of the room, there is no way to deny that you see it, the room, the corner, the label "pink elephant," and so on. That experience is happening.
Deduced Reality is a subset of Directly Perceived Reality. It is the set of all statements (thoughts, etc.) about other parts of directly perceived reality. "That pink elephant is not real" is a statement belonging to deduced reality.
I like it! So what we call an illusion is a discrepancy between Directly Perceived Reality and Deduced Reality. Is that right? Is it fair to say, then, that Deduced Reality is what most people think of as Real Reality? And would it also be fair to say that, to a large extent, the study of perception (in psychology and physiology) has largely been concerned with determining the relationship between Directly Perceived Reality and Deduced Reality? Isn't that basically what psychophysics is about, for example?
Models belong to deduced reality.
What other aspects of Deduced Reality are there besides models? If, for example, I deduce that a stick remains rigid when placed in water, isn't that kind of a model of stick behavior? So when I see the stick bend at the surface, don't I treat that as an illusion because the Directly Perceived Reality (bent stick) is inconsistent with the Deduced Reality (my model) of the stick as rigid?
I love the distinction between Real Reality, Directly Perceived Reality and Deduced Reality. If I include it in any writing I will give both you and Bob Clark credit for it. It's a very helpful distinction -- or so I deduce, anyway;-)
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