Assuming you are using "intentionality" as discussed in the SEP... — wonderer1
Which states that:
In philosophy, intentionality is the power of minds and mental states to be about, to represent, or to stand for, things, properties and states of affairs. To say of an individual’s mental states that they have intentionality is to say that they are mental representations or that they have contents.
So I can't see how your proposed definition:
I think that only physical systems with outputs, that are about some aspect of their inputs have intentionality. — wonderer1
squares with what is given in the SEP article. You've already suggested a couple of times that ChatGPT might possess intentionality, which in both cases, ChatGPT itself has rejected. Besides, when you mention neural networks or artificial intelligence, you do so precisely because of
what they represent: you are saying that they
represent the way in which physical systems are able to embody intentionality. So again your argument is recursive - you are imputing intentionality to those systems on the basis of your rational ability to draw reasoned conclusions, which is the very faculty that is in question.
The intention of the OP, seems to argue that rational humans are not mere instinctive animals. Hence more than just aggregations of atoms & tangles of neurons. It's that little extra immaterial essence --- je nais se quoi --- that distinguishes human nature from animal nature. — Gnomon
As noted, C S Lewis was arguing as a believer. My motivation is different - whilst I'm not atheistic, I also have no intention of evangalising for belief in God. My view is that the commonly-held materialism of secular culture is something like a popular mythology, an aggregation of views that 'everyone knows' must be true (science says so!) But that many of the elements of that worldview can be called into question by philosophical analysis.
In regards the question of the nature of 'intention', the following is glossed from the essay by Victor Reppert, where he defines what exactly is being called into question by the argument.
Basic assumptions of materialism
First the materialist worldview presumes a mechanistic base level. This doesn't mean necessarily deterministic - there can be chance at the basic level of reality in a mechanistic worldview (e.g. Heisenberg's uncertainty principle and the 'quantum leap'.) However at the level of basic physics, nature is
free of purpose, free of meaning or intentionality, free of normativity, and absent of any and all forms of subjectivity. If one is operating within a materialistic framework, then one cannot attribute purpose to what happens at the basic level. Talk of purpose may be appropriate for macrosystems, such as animals and humans, but that is a purpose that is ultimately the product of a purposeless basic physics. This is the level at which the role of intentionality in nature is to be debated.
Furthermore, 'what something means' cannot be an element of reality at the basic level. Meaning is only ever imputed by subjects, and subjects don't exist on that level - so the Universe, absent subjects, is also devoid of meaning.
There is nothing normative in basic physics. We can never say that some particle of matter is doing what it is doing because it
ought to be doing that. Rocks in a landslide do not go where they go because it would be a good idea to go there. To quote Wittgenstein, 'in the world everything is as it is and happens as it does happen. In it there is no value—and if there were, it would be of no value. If there is a value which is of value, it must lie outside all happening and being-so. For all happening and being-so is accidental.' (TLP 6.41)
Basic physics is lacking in subjectivity. The basic elements of the universe have no 'points of view,' and no subjective experience (this is the point which is disputed by panpsychism). Consciousness, if it exists, must be a 'macro' feature of basic elements massed together. This is presumed to be where evolutionary biology enters the picture - by providing the mechanism through which simple elements are combined so as to give rise to the emergence of consciousness.
The level of basic physics must be causally closed. That is, if a physical event has a cause at time t, then it has a physical cause at time t. Even that cause is not a determining cause; there cannot be something nonphysical that plays a role in producing a physical event. If you knew everything about the physical level (the laws and the facts) before an event occurred, you could add nothing to your ability to predict where the particles will be in the future by knowing anything about anything outside of basic physics.
Finally whatever is not physical, at least if it is in space and time, must
supervene on the physical. Given the physical, everything else is a necessary consequence, including minds and purposive behaviour.
In summary, the world is at bottom a mindless system of events at the level of fundamental particles and fields, behaving in the manner described by physical laws, and everything else that exists must exist consequentially to what is going on at that basic level. This understanding of a broadly materialist worldview is not a tendentiously defined form of reductionism; it is what most people who would regard themselves as being in the broadly materialist camp would agree with, a sort of “minimal materialism.” Reppert also maintains that any worldview that could reasonably be called “naturalistic” is going to have these features, and the difficulties that the 'argument from reason' presents against a “broadly materialist” worldview thus defined will be typical of naturalism insofar as it maintains these materialist tenets.
Incidentally, for anyone who is up for rather a long (i.e. >10,000 word) read, I've found an excellent essay by non-reductionist biologist Stephen Talbott,
From Physical Causes to Organisms of Meaning, which discusses in depth and details how to get from the 'blind, non-purposive' causes of physics to the plainly purposive behaviours which animate the entire organic domain.