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Alvin Plantinga and Gary Gutting discuss the rationality of atheism Alvin Plantinga and Gary Gutting discuss the rationality of atheism

02-14-2014 , 06:08 AM
Quote:
Originally Posted by NotReady
The way you stated it in your summary and your answer to my correction left the impression that A.P. thinks belief as such is based on the s.d., which would leave open a charge of irrationalism. The same error is often made concerning WLC's use of the same idea - the internet is clogged with assertions that he's irrational for that very reason.
The important part - on which we all agree - is that AP believes that we have reason to think God would give us reliable truth-detecting capacities over or instead of those given to us by evolution. The sensus divinatus is just one example of such a truth-guiding capacity. I did not, and do not, mean to suggest that the sd is THE truth-guiding capacity for all beliefs. Frankly, I don't care if the claim is that beliefs about tigers emerge from the sensus divinatus or the sensus expelliarmus: both are equivalent as far as I am concerned.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 07:15 AM
As it turns out, last night Massimo Pigliucci posted his response to the Gutting interview.

Some excerpts relevant to the thread:

W/r/t wellnamed and BeaucoupFish's questions about materialism:

Quote:
Originally Posted by Massimo P
First, a materialist would not say that a belief is a material structure in the brain, but rather that beliefs are instantiated by given material structures in the brain. This is no different from saying that numbers, for instance, are concepts that are thought of by human beings by means of their brains, they are not material structures in human brains. Second, as the analogy with numbers may have hinted at, a naturalist (as opposed to a materialist, which is a sub-set of naturalist positions) has no problem allowing for some kind of ontological status for non-material things, like beliefs, concepts, numbers and so on. Needless to say, this is not at all a concession to the supernaturalist, and it is a position commonly held by a number of philosophers.

W/r/t the question-begging assertion that content of a belief is not material:

Quote:
Originally Posted by Massimo P
Plantinga goes on with his philosophy of mind 101 lesson and states that the real problem is not with the existence of beliefs per se, but rather with the fact that beliefs cause actions. He brings up the standard example of having a belief that there is some beer in the fridge, which — together with the desire (another non-material thingy, instantiated in another part of the brain!) to quench one’s thirst — somehow triggers the action of getting up from the darn couch, walk to the fridge, and fetch the beer (presumably, to get right back to the couch). Again, the full quote so you don’t think I’m making things up:
“It’s by virtue of its material, neurophysiological properties that a belief causes the action. It’s in virtue of those electrical signals sent via efferent nerves to the relevant muscles, that the belief about the beer in the fridge causes me to go to the fridge. It is not by virtue of the content (there is a beer in the fridge) the belief has.”
But of course the content of the belief is also such in virtue of particular electrical signals in the brain. If those signals were different we would have a different belief, say that there is no beer in the fridge.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 05:54 PM
Quote:
Originally Posted by zumby
Something else important is that not all beliefs are the same. For example, beliefs about direct sensory input ("my cat is jumping on my computer desk") are more likely to be true than beliefs about, say, abstract objects or the nature of infinity etc. Will expand on this if necessary.
I'd very much like you to expand on this at some point.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 06:07 PM
Not much more to say, he's just a bit of a naughty cat.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 06:18 PM
I agree with it, it was something I was thinking about a bit but hadn't tried to elucidate.

If you think about evolutionary processes and the kinds of beliefs that would be correlated with fitness (leaving aside the ontological stuff about contents of beliefs and the EAAN for the moment) it certainly seems reasonable that the kinds of beliefs that have a more obvious direct relation with survival would be selected for, rather than very abstract beliefs for which there is no obvious connection. Properly interpreting direct sensory input has some clear applications towards avoiding danger, finding a mate, etc etc. It's reasonable to think that evolution does not lead to the reliability of beliefs of a very abstract nature, but does lead to the reliability of beliefs about when to high tail it away from the bush.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 06:31 PM
Quote:
Originally Posted by well named
I agree with it, it was something I was thinking about a bit but hadn't tried to elucidate.

If you think about evolutionary processes and the kinds of beliefs that would be correlated with fitness (leaving aside the ontological stuff about contents of beliefs and the EAAN for the moment) it certainly seems reasonable that the kinds of beliefs that have a more obvious direct relation with survival would be selected for, rather than very abstract beliefs for which there is no obvious connection. Properly interpreting direct sensory input has some clear applications towards avoiding danger, finding a mate, etc etc. It's reasonable to think that evolution does not lead to the reliability of beliefs of a very abstract nature, but does lead to the reliability of beliefs about when to high tail it away from the bush.
Yep.

Spoiler:
I was coming back here to give a serious answer, but wn slow-ponied me, honest
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 09:05 PM
Quote:
Originally Posted by zumby
Frankly, I don't care if the claim is that beliefs about tigers emerge from the sensus divinatus or the sensus expelliarmus: both are equivalent as far as I am concerned.
I was wondering why you wanted to continue this when you're so obviously wrong. Now I'm really glad I made the correction - it was needed more than I thought.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 09:11 PM
I've yet to see that I've actually said anything wrong. As far as I can make out you are just launching a pre-emptive strike - against hypothetical arguments someone might make - that had little to do with anything I said.

I.e:

Quote:
Originally Posted by you
The way you stated it in your summary and your answer to my correction left the impression that A.P. thinks belief as such is based on the s.d., which would leave open a charge of irrationalism. The same error is often made concerning WLC's use of the same idea - the internet is clogged with assertions that he's irrational for that very reason.
I've said that I didn't mean to imply what your "impression" suggested.

Also this exchange:

Quote:
Originally Posted by you
The point is that s.d. is relevant only for belief in God and other religious beliefs, not for beliefs in general.
Quote:
Originally Posted by me
Yeah, fine.
Not sure why you are being so aggressive, tbh.

Last edited by zumby; 02-14-2014 at 09:20 PM.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 09:15 PM
Quote:
Originally Posted by zumby
I've yet to see that I've actually said anything wrong. As far as I can make out you are just launching a pre-emptive strike - against hypothetical arguments someone might make - that had little to do with anything I said.
You keep leaving the impression that A.P. bases ALL decisions on the s.d. rather than logic, evidence, etc. As I said, this is similar to positions taken by internet skeptics re WLC on the same point. The s.d. is evidence for the believer, but it is (internal)evidence only for the existence of God and other related beliefs, such as faith, God's love, etc. We still make decisions on natural matters, such as the Big Bang and the lack of evidence for macroevolution the same way everyone else does - evidence and reason.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 09:29 PM
Quote:
Originally Posted by NotReady
You keep leaving the impression that A.P. bases ALL decisions on the s.d. rather than logic, evidence, etc. As I said, this is similar to positions taken by internet skeptics re WLC on the same point. The s.d. is evidence for the believer, but it is (internal)evidence only for the existence of God and other related beliefs, such as faith, God's love, etc. We still make decisions on natural matters, such as the Big Bang and the lack of evidence for macroevolution the same way everyone else does - evidence and reason.

Righto... Lemonzest, Aaron, wellnamed, other non-batcrap crazy Christians: am I leaving this impression?
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 10:13 PM
Quote:
Originally Posted by zumby
Righto... Lemonzest, Aaron, wellnamed, other non-batcrap crazy Christians: am I leaving this impression?
Forget it - my point is made - this is no longer worth it.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 10:23 PM
I did not get that impression. That said, my position (which is not plantingas) is open to charges of irrationality so perhaps I am less sensitive about the possibility.

Although I might try to argue that arational is not irrational
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-14-2014 , 10:30 PM
I don't agree to forget it. You are accusing me of saying something I've explicitly denied multiple times. If this is a case of me genuinely giving the wrong impression then I want to know so I don't make the same mistake again.

If, however, this is just you throwing mud around in order to cover your weird tangent about WLC then I want to know so I can just ignore your posts in future.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-15-2014 , 09:00 AM
Quote:
Originally Posted by zumby
I don't agree to forget it. You are accusing me of saying something I've explicitly denied multiple times. If this is a case of me genuinely giving the wrong impression then I want to know so I don't make the same mistake again.

If, however, this is just you throwing mud around in order to cover your weird tangent about WLC then I want to know so I can just ignore your posts in future.
You're the mud slinger here - think what you like - I've already decided to ignore you.
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02-15-2014 , 09:23 AM
OK tiger.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-15-2014 , 01:53 PM
Quote:
Originally Posted by zumby

Quote:
Originally Posted by Massimo P
First, a materialist would not say that a belief is a material structure in the brain, but rather that beliefs are instantiated by given material structures in the brain.
I think the critics of materialism understand what materialists are saying. What isn't so apparent is that Pigliucci understands the criticism. From Plantinga’s Against Materialism (p. 14):
And now the difficulty for materialism is this: how does it happen,
how can it be, that an assemblage of neurons, a group of material objects
firing away has a content?
[….] The fact is, we can't see how it could have a content.
Quote:
Originally Posted by Massimo P
But of course the content of the belief is also such in virtue of particular electrical signals in the brain. If those signals were different we would have a different belief, say that there is no beer in the fridge.
Of course “the content of the belief is also such in virtue of particular electrical signals in the brain” holds if materialism is true. But no one is challenging the internal validity of materialism. What’s being challenged is materialism’s ability to explain the phenomenon of consciousness, or more to the point the content of consciousness, without just decreeing its emergence from a physical substratum. In other words, how can it be that physical happenings, which aren’t inherently about anything, suddenly come to be about something?
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-15-2014 , 02:08 PM
Quote:
Originally Posted by well named
It's reasonable to think that evolution does not lead to the reliability of beliefs of a very abstract nature, but does lead to the reliability of beliefs about when to high tail it away from the bush.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-15-2014 , 02:19 PM
Quote:
Originally Posted by duffee
Steve Martin seems to be lacking a sensus divinitatis.
Alvin Plantinga and Gary Gutting discuss the rationality of atheism Quote
02-15-2014 , 02:44 PM
Quote:
Originally Posted by duffee
I think the critics of materialism understand what materialists are saying. What isn't so apparent is that Pigliucci understands the criticism. From Plantinga’s Against Materialism (p. 14):
And now the difficulty for materialism is this: how does it happen,
how can it be, that an assemblage of neurons, a group of material objects
firing away has a content?
[….] The fact is, we can't see how it could have a content.
Of course “the content of the belief is also such in virtue of particular electrical signals in the brain” holds if materialism is true. But no one is challenging the internal validity of materialism. What’s being challenged is materialism’s ability to explain the phenomenon of consciousness, or more to the point the content of consciousness, without just decreeing its emergence from a physical substratum. In other words, how can it be that physical happenings, which aren’t inherently about anything, suddenly come to be about something?
Well, there are tons of examples where something has a property that does not belong to it's constituent parts. For example, atoms do not have a temperature, but collections of atoms in certain dynamic arrangements create temperature. Temperature is an emergent property of atoms. There is no, a priori reason to think that consciousness cannot be an emergent propery of neurons etc. So if that is your point then it is a simple composition fallacy, easily disproved by both logic and virtually every analysis of the properties of complex systems and the properties of their components.

Given that this would be such an obvious error, perhaps you understand that there is no a priori reason to preclude a materialistic account of consciousness, but are instead just asking for the actual explanation. Clearly, we don't know what the explanation is as yet. A hundred years or so ago we did not know how to explain the emergence of temperature from physical systems.
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02-15-2014 , 04:07 PM
My experience has been, in reading on philosophy of mind, that really the difference between physicalists with regard to consciousness (say Dennett) and non-physicalists (Searle, Chalmers, etc) is that the non-physicalists are entirely persuaded by an intuition that there has to be something that is irreducible. The intuition is stated pretty plainly in that quote:

Quote:
how can it be, that an assemblage of neurons, a group of material objects
firing away has a content?
That's not actually an argument, except from incredulity. Same with the argument about meaning, although it's slightly different. Douglas Hofstadter is a great read as far as thinking about meaning, language, and reductionism. Godel, Escher, Bach is a classic.

Again, I am somewhat in the same boat as Searle et al, in a certain way, but I think it's important to realize that it is the intuition itself, rather than an argument, that is the fundamental reason for the disagreement. The Mary's Room thought experiment I linked before is useful. Dennett will say that Mary does not learn anything new. Plantinga does not agree. There is no argument for why she will learn something new, it is taken as self-evident by non-physicalists that all conceivable possible knowledge about neurons and cones and retinas and photons will not constitute an experience of color
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02-15-2014 , 06:46 PM
Quote:
Originally Posted by well named
My experience has been, in reading on philosophy of mind, that really the difference between physicalists with regard to consciousness (say Dennett) and non-physicalists (Searle, Chalmers, etc) is that the non-physicalists are entirely persuaded by an intuition that there has to be something that is irreducible. The intuition is stated pretty plainly in that quote:



That's not actually an argument, except from incredulity. Same with the argument about meaning, although it's slightly different. Douglas Hofstadter is a great read as far as thinking about meaning, language, and reductionism. Godel, Escher, Bach is a classic.

Again, I am somewhat in the same boat as Searle et al, in a certain way, but I think it's important to realize that it is the intuition itself, rather than an argument, that is the fundamental reason for the disagreement. The Mary's Room thought experiment I linked before is useful. Dennett will say that Mary does not learn anything new. Plantinga does not agree. There is no argument for why she will learn something new, it is taken as self-evident by non-physicalists that all conceivable possible knowledge about neurons and cones and retinas and photons will not constitute an experience of color
I read the Mary's Room experiment and as is typical for these types of argument it makes the fundamental mistake of making the observer all-knowing. The observer knows everything about Mary's world and also exactly to what extent her knowledge is precise. Two things the observer could not know if put in Mary's world. So basically, when you boil it down to the bones, it is a claim of omniscience. "I know everything, therefore I am right". And if we accept that someone is omniscient... well, you get my drift.

However, what I find far more amusing is that it also fails on a practical level. If Mary's brain and eyes has never seen color, she will likely not see it when she gets out either, as that part of her brain would not have developed properly.

And arguing for the superiority of intuition by using an example that is refuted by inquisition is quite funny.
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02-15-2014 , 06:53 PM
I don't think the idea of an omniscient observer is central to Mary's Room as a thought experiment, but maybe I'm not understanding you properly.

The reason it is a thought experiment instead of a real experiment is because it asks you to consider what would happen in a scenario you can't possibly test, because it involves Mary essentially having inhuman levels of intelligence/knowledge (Dennett did a version of this using a robot instead of Mary, although he was speaking about p-zombies), so from that standpoint yes it sort of assumes impossibilities, but I don't think that ruins the usefulness of it, at least not as a way of helping isolate and clarify intuitions about the nature of knowledge about color. It does not entail the person making the argument (who I am taking as your observer) claiming omniscience, although to the extent that you equate that to my point that the conclusion that Mary learns something when she leaves the room amounts to a bare intuition, you are agreeing with me. That's the limitation of Mary's room as an argument. It's really the entire point of it. But not insofar as a claim of omniscience, but as a claim that the idea that Mary learns something is self-evident, intuitively
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02-15-2014 , 07:13 PM
For those unfamiliar with Mary's Room:

Quote:
In philosophy of mind, Mary’s Room is a thought experiment meant to demonstrate the non-physical nature of mental states. It is an example meant to highlight the knowledge argument against physicalism. The example first appears in an article by Frank Jackson, entitled “Epiphenomenal Qualia”, which appears in Philosophical Quarterly 32:127 (1982).

The thought experiment is as follows: Mary lives her entire life in a room devoid of colour—she has never directly experienced colour in her entire life, though she is capable of it. Through black-and-white books and other media, she is educated on neuroscience to the point where she becomes an expert on the subject. Mary learns everything there is to know about the perception of colour in the brain, as well as the physical facts about how light works in order to create the different colour wavelengths. It can be said that Mary is aware of all physical facts about colour and colour perception.

After Mary’s studies on colour perception in the brain are complete, she exits the room and experiences, for the very first time, direct colour perception. She sees the colour red for the very first time, and learns something new about it — namely, what red looks like.

Jackson concluded that if physicalism is true, Mary ought to have gained total knowledge about colour perception by examining the physical world. But since there is something she learns when she leaves the room, then physicalism must be false. As Jackson explains:

It seems just obvious that she will learn something about the world and our visual experience of it. But then is it inescapable that her previous knowledge was incomplete. But she had all the physical information. Ergo there is more to have than that, and Physicalism is false.

The Mary’s Room example has been cited by a number of other philosophers, such as David Chalmers who uses the example to suppose that there are additional irreducible properties of the brain beyond the physical ones known to scientists.

It is important to note, though, that years later, Jackson reversed his stance on the argument, explaining that the knowledge argument and Mary’s Room are deeply rooted in our intuitions about the matter, but that science can offer other explanations for the apparent discrepancy.
[source]
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02-15-2014 , 07:27 PM
Quote:
Originally Posted by well named
I don't think the idea of an omniscient observer is central to Mary's Room as a thought experiment, but maybe I'm not understanding you properly.

The reason it is a thought experiment instead of a real experiment is because it asks you to consider what would happen in a scenario you can't possibly test, because it involves Mary essentially having inhuman levels of intelligence/knowledge (Dennett did a version of this using a robot instead of Mary, although he was speaking about p-zombies), so from that standpoint yes it sort of assumes impossibilities, but I don't think that ruins the usefulness of it, at least not as a way of helping isolate and clarify intuitions about the nature of knowledge about color. It does not entail the person making the argument (who I am taking as your observer) claiming omniscience, although to the extent that you equate that to my point that the conclusion that Mary learns something when she leaves the room amounts to a bare intuition, you are agreeing with me. That's the limitation of Mary's room as an argument. It's really the entire point of it. But not insofar as a claim of omniscience, but as a claim that the idea that Mary learns something is self-evident, intuitively
The problem isn't inhuman levels of intelligence, the problem is that the thought experiment begs the question: The argument states that Mary holds all physical knowledge of color vision and then proceeds to state that she learns something new about color vision.

Thus the conclusion is in the premises.

These things are typical in thought experiments where the "observer" (the one making the argument) assumes total and complete knowledge about the imagined world in which the experiment takes place and then superimposes this on the world he/she knows.
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02-15-2014 , 07:38 PM
wouldn't it be begging the question to assume prior to the thought experiment that all physical knowledge constituted all knowledge? Given that the point of the thought experiment is to question physicalism?

I think you are wrong that it begs the question for that reason. Also it's not an argument in the sense of having premises. Dennett uses the term "intuition pump" for these things, and I think it's apt. The point of it is to get you to think of a scenario and see what you intuitively think the outcome would be. The premises are really our naive intuitions about qualia, and it's those intuitions that prompt the conclusion that Mary learns something.

Again, I don't really see how the one making the argument is assuming total and complete knowledge about the world here, although I would agree with a slightly less aggressive counter-argument that the intuition which drives the conclusion glosses over the fact that "all physical knowledge about color and color vision" is an impossible-for-humans-to-process amount of knowledge, to the point of calling into question the value of the naive intuition in the first place.

That is the physicalist objection to the thought experiment in a nutshell: that the intuition is not valuable, and that the thought experiment does not really constitute any kind of real argument, only a pretty bare assertion. I agree with that objection.

In any case, the reason I mentioned the experiment twice was not so much that I think it's compelling, but that often times in discussions about these issues I see both sides asserting as obvious the things that are really what the disagreement is about. So duffee posts quotes where a philosopher asks incredulously how firing neurons could constitute content, and you now are pointing out that, as though it were contradictory, that the experiment assumes Mary has "all physical knowledge" yet learns something new, which is more or less begging the question the other way, i.e in assuming that physical knowledge is the only knowledge there could be.

It reminds me a lot of the conversations about free will and compatibilism, and fair enough, it took me quite a bit of time (and some help from zumby) to realize that my intuition that free will couldn't possibly be compatible did not actually exhaust the possible meanings of the terms. I think a lot of times the two sides have trouble even understanding what is motivating the conclusions of the other side because there is such a fundamental disconnect in thinking
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