In India, there is a Charvaka system of thinking which argues similarly that that the body endowed with the quality of intelligence is the Self. They give evidence that
intelligence is observed only where a body is observed while it is never seen without a body.
I am aware of Charvaka, Lokayata, Brihaspati, etc., but only at a very superficial level. From what I have read, their contribution to Indian culture was either suppressed or simply not preserved by Hindu scholarly tradition. So, as with Greek and Roman atheists, the historical record only preserves criticisms of their points of view--the rebuttals to their arguments--not their rejoinders in the debate. That is regrettable, but the historical record of India's past is full of gaps.
The idealists counter as below:
"A body is never perceived without complexion, etc. However, a body is sometimes perceived without consciousness. Therefore consciousness is not a quality of the body." Vatsyayana on Nyaya Sutra iii.2.47
This argument strikes me as very weak. First, analogies are logical fallacies, because they always break down. Complexions and intelligence are not in the same category of "properties". One is tangible and the other is not. Second, the argument depends on the word "quality" having the same meaning in the Charvaka text as in the rebuttal to it, but the Charvakas could have rejected that as equivocation--a semantic difference rather than a substantive one. I don't know how they would have responded, because we have little surviving commentary from their school.
"The qualities of body are of two kinds only, viz. (1)imperceptible, like heaviness and (2) perceptible by external senses eg complexion, etc. Consciousness differs from both these kinds: it is not imperceptible for it is internally apprehended, and it is not perceptible by the external senses, for it is an object known by the mind only. Therefore, consciousness is a quality of some substance other than the body." Vatsyayana on Nyaya Sutra iii.2.53
Again, the rebuttal depends on false analogy and possible equivocation on the word "quality". Weight is actually "perceptible by external senses", but not by vision. You can judge the heaviness of objects by attempting to lift them or by weighing them. There is no reason why human bodies only have to have these two types of qualities, so his initial assumption may have been flawed from the perspective of Charvakas.
This debate is eternal that has never been resolved.
We can never know how the materialist Charvakas defended themselves against such arguments, because we have no record of their defenses.
However, it is illogical to consider that a fixed awareness running through existence is based on moment to moment changeable structures. Structures can explain further structures but not the consciousness that knows the structures.
But awareness is a fleeting phenomenon. It can only be described as a sequence of events in relation to physical events. Physical objects like bodies tend not to be conceived of as constantly-changing, even though they do change (often imperceptibly) from moment to moment. Thought is systemic in nature, not concrete. It is a property of interactions. Destroy the physical system that creates it, and you destroy the possibility of its existence.
I tried reading it and got stuck. The themes are built on an a-priori assumption that intelligence is a product of inert matter. It does not prove that.
Well, I thought that you might enjoy the meditation, but you are right that Hofstadter assumes that intelligence is the product of a physical system of interactions. He describes it quite eloquently with a series of metaphors--e.g. the beehive metaphor. You talk as if he were making a gratuitous assumption. I think that the gratuitous assumption is on the part of those who assume that intelligence can exist independently of the physical interactions that it seems so tightly coupled to.
OTOH, with an understanding of two level awareness of a) basic and indivisible "I am" (which is formless and existing) giving rise to b) secondary "I am this body-brain" when in association with objects, the concepts of self-reference and recurrence become meaningful and leads to consciousness as the irreducible nature of the existence. The process has been compared with the way heat energy glows, acquiring the shapes of objects in it. Or, light bulbs glowing due to resistance to free flow of electrons.
If there must be a physical process to cause light, then that explains the absence of light in the absence of physical process. I am only saying that intelligence is like light. It depends on an operating physical system for its manifestation.
Any way. We actually agree more than you realise. You have already acknowledged that brains are programmed by nature and that nature is all-pervading and within us also. I accept that much.
Yes. We are an integral part of nature.
However, can nature stand alone? Nature, by definition, is nature of something. What is that something?
Reality.
Nature, if you consider it to be creator of brains etc. and composed of parts, then it could not have existed prior to its components just as a car cannot exist before its components -- only the idea of a car can exist in some mind.
Yes, but cars are things that were intelligently designed. Biological entities are known to have evolved through mechanical processes--the interaction of simpler processes that created ever more systemic complexity over time.