| | The Nature of the Physical and NonPhysicalPer Jordan's suggestion, and because the subject is a diversion in the context of the Concepts/Percepts thread, I begin this thread on the nature of the physical and the non-physical. The questions seem to center around whether or not the mind is "physical" and whether or not there can be anything, any existent, which is not in some sense physical. I probably won't have much time to participate in this thread (famous last words), but I'll offer portions of some of my posts, slightly edited, from that thread as grist for this mill, if anyone is truly interested in further discussion. If not, just consider this an article of sorts. NH
From the tread: Concepts and Percepts--Are They Different? Are They Certain?
Post 99
How do we define "physical"?
I doubt it's any more possible to actually define "physical" or "energy" than "existence."
These are so close to the fundamental facts of existence that ostensive definition is all that is practically available. Quoting dictionaries just leads to tight little loops of A is B is A.
That's to be expected at that level of description of things. Words have their limitations--some things simply have to be experienced, the nature of an ostensive definition.
NH
Post 71
Is there something beyond what we call the "physical"?
In my view, all existents can be described as:
1. Physical, which includes all forms of matter and energy and phenomena arising from the nature of these, like space-time.
2. Organization, pattern and process, all of which is conveyed [as information borne by a medium] by the physical world or other subpatterns.
It should be said that these are not mutually exclusive, but mutually inclusive. In other words, the physical cannot exist without the organizational, and the organizational ultimately depends upon the physical as a medium.
NH
Post 97
Aren't ABSTRACTIONS non-physical? I can hold the abstract concept "unicorn." The REFERENT of the abstraction does not exist, but the abstraction-as-concept is encoded in the patterns of my living brain.
For us to say that my abstraction-as-concept is not "physical," we would have to deny that organization of matter is not physical.
That might not look like much of a problem on the surface, but it might actually entail an almost infinite regress of denial! It may well turn out that most of the nature of matter itself is organizational--physics certainly seems to be leading us in that direction.
If the physical turns out to be largely organization with very little actual "substance," it seems consistent to hold that organization at macro levels is also "physical."
NH
Post 96
Doesn't the 'physical' refer to matter and the 'nonphysical' refer to energy?
That's an understandable view to adopt, because matter (like rocks) feels so "solid" and energy (like light) feels so insubstantial.
But not only did Einstein demonstrate the equivalence of energy and matter with E=mc^2, much of the apparent solidity of matter owes entirely to energy. (Ultimately, it all may--there may be no actual 'solids' if we go down to the incomprehensibly small sizes of superstring theory.)
The floor holding you up, for example, is largely empty space between atoms and molecules, held together with electromagnetic energy billions of times stronger than gravity. (That's why the Earth doesn't pull you through the floor.)
When a nuclear device is exploded, some matter is actually converted to energy.
All this is why in post in my post 71 of this thread I made both matter and energy "physical," and contrasted that with "organization," though the latter two classes are theoretically inseparable.
NH
Post 110
Can't mental processes be said to be non-physical?
Nathaniel Branden, The Psychology of Self-Esteem, ch. 1, pg. 9:
"... It is a species of what philosophers term “the reductive fallacy” to assert that mental processes are “nothing but” neural processes—that, for example, the perception of an object IS a collection of neural impulses, or that a thought IS a certain pattern of brain activity. A perception and the neural processes that mediate it are not identical, nor are a thought and the brain activity that may accompany it. Such an equation is flagrantly anti-empirical and logically absurd.”
That, as that nasty President man said, is a matter of what IS is.
I can't think of any sane person (which excludes a few philosophers) who would claim that a Patek Philippe Calibre 89, the most complicated mechanical watch ever produced, is just a collection of metal and glass chunks.
Yet is IS "a collection of metal and glass chunks." It differs from other metal and glass chunks only in the nature of its organization.
This is not to minimize the transcendental nature of that organization. It is to say that what Branden writes is, taken literally, incorrect.
So far as we know, mental processes ARE "'nothing but' neural processes... a collection of neural impulses, ... a certain pattern of brain activity." Furthermore, "a perception and the neural processes that mediate it" ARE inclusive and identical.
If, as Mr. Branden claimed in this early work of his, equating brain activity and thought is "anti-empirical and logically absurd," it is incumbant upon the claimant to produce that empirical evidence and logic. I'm not sure he would still make this claim in this fashion. I will put the question to him.
Further, quoting J.B. Pratt:
“[Reductive materialism] maintains that consciousness IS A FORM OF BRAIN ACTIVITY … To say that consciousness IS a form of matter or of motion is to use words without meaning … "
"To say that consciousness IS a form of matter or of motion is to use words without meaning..."
Not at all. Every day thousands of AI researchers are putting matter into motion (computers) and producing machines which are more and more becoming "conscious" in very sense of that word.
Their consciousness does not yet quite resemble HUMAN consciousness, but it does resemble that of lower animals. To demand anything more is absurd--nature had 3 billion years to evolve human intelligence, and we've been working on the problem in a substantive way barely over 3 DECADES. We are still about 10-15 years away from having raw computer power equivalent to that of the human brain, and an unknown number of years away from modeling the PROCESSES of the human mind.
Those who hold that consciousness/mind is "something more" than physical brain and organization/pattern are obliged to say what that might be. Just claiming that the physical/organizational is "not enough" without stipulating what else is required is hollow denial.
That position could conceivably (though I doubt it) be ultimately correct, but I would require evidence and sound reasoning to be persuaded.
NH
Post 90
How can we be sure that the non-physical couldn't exist?
I don't believe anything in the absense of evidence, but my study of physics has led me to keep an open mind about everything.
Nature doesn't care whether we can conceive of something or not, and more than She cares if a dog can comprehend Riemannian geometry and the curvature of space-time. Nature, if She has a sense of humor, may well be laughing at our manipulated words and other symbols, our fuzzy ideas and our pronouncements about the ultimate nature of things.
Or, maybe not. Regardless, NOTHING, no claim imaginable, could be any more bizarre and counterintuitive than the claims of modern physics.
If somebody says, 'There can be something beyond our physical realm and the organization superimposed upon it,' I will respond by saying that I can't conceive of such, and that I think even parallel dimensions would still fall into that "physical" category, but...
...do I detect a smile, Mother N?
NH
END
(Edited by Nathan Hawking on 5/11, 2:24pm)
(Edited by Nathan Hawking on 5/11, 4:30pm)
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