To be honest, philosophy is not my field of expertise. I would venture an answer that we're convinced of love and other emotions because they're universal and everyone feels them. We all feel love in one form or other, even though the fact remains that it's difficult to put physical evidence for love on the table. If we were to communicate with, say, an A.I. construct, computer program, or alien intelligence with no concept of love, then we might need to start looking for physical evidence if we intend to convince them and/or teach them how to identify it, but we as humans agree among ourselves that evidence for love is largely unnecessary.
Yes, exactly. The experiences differ between us and your hypothetical alien, and so we cannot convince them of the existence of something that, to a human, is self-evident. The same is true between believer and non-believer. The difference is in our experience. I simply cannot give you a scientific accounting of all my experiences. That doesn't make them any less real.
And so I put "experiential" evidence in a different category than scientific evidence. Sometimes I will also talk about testimonial, legal, and historical evidence. IMO much of the qualitative evidence you will want to admit in support of evolution is actually what I would call historical evidence. That is why, beginning back in post #36, Research6 started talking aobut evolution as "an interpretation of prehistory." I don't know if he shares my views on evidence, but that is why I agreed with him.
I'm not really a good philosopher, so I think my ability to come up with rock-solid definitions is poor at best, but if you want to throw any examples my way I think I'd be able to do a pretty good job of telling you whether they're evidence or not.
I appeciate your honesty, but "I'll know it when I see it" is not an acceptable scientific device. One of the ways scientists try to eliminate bias is by predicting. Then, if something goes wrong, they can't amend their position to force fit a theory to the data (as often happens in Internet flame wars). So, we'll need to agree on things before they are admitted as evidence, not after. That is what makes quantification so useful.
I guess we're at odds as to what constitutes of evidence, but with that said, I was and am still keen to listen to your evidence for creationism, even if I can't guarantee I'll agree with it.
Well, my interest is the reason why we're at odds, not the evidence itself. But I think it will help advance the discussion about assumptions if I give a few examples. So, here it goes:
Based on the preceding (though incomplete) discussion about evidence, I'll tell you that I am aware of 3 basic approaches to presenting creationist "evidence." 1) Show the flaws in evolutionary conclusions drawn from the data, 2) Use the scientific method on a creationist prediction, 3) Use experiential evidence.
I'm a little rusty on some of this, so I didn't spend a lot of time on #1. Mainly because I'm afraid it would just devolve into an argument over whether my cited example is a true flaw or not (Yes it is, No it's not). But IMO some of the best arguments against evolution focus on abiogenesis. Whether you consider abiogenesis part of evolution or not, the question of how we got here is important to the overall discussion. I know one of the debates in abiogenesis is whether conditions on earth were ever suitable for some of the claimed mechanisms for jump-starting life.
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I'll give more detail on #2 - specifically species stasis. I did some digging on this because my knowledge is mainly historical and regards some of the studies done in the 19th century, which are out of date. Here is what I found (granted that it was a whirlwind tour of the subject):
Farmers and breeders have long known that attempts to improve crop yields or milk production from cows can only go so far. That seems to support the creationist claim of species stasis. So, some studies were done on the subject, and the results are part of a book published in 1960, "Introduction to Quantitative Genetics" by Falconer. Since I'm a novice, I may be misunderstanding what Falconer was saying, but it appears that he says an allele may reach either fixation or loss in any population even if mutation is present (and he uses some mathematics to back that up). The key to whether that point is reached is the size of the population. He uses some standard
assumptions (note the word folks) about mutation rates and so forth, and concludes that the dividing line between populations that would evolve and those that wouldn't is about 50,000 organisms.
These results were codified in what is known as the Hardy–Weinberg principle, and they have been verified experimentally. For example, there is the fruit fly experiment of Mather & Harrison ("The Manifold Effect of Selection",
Heredity, 1949) which showed that mutation caused a change in the number of chaetae that the flies possessed, but that the number never changed above or below certain limits.
So, the scientific literature supports the possibility of species stasis. However, here is what stumps me at the moment. The evolutionist will likely claim that population sizes greater than 50,000 are readily available. That may be true now, but what about in the past? If life supposedly arose from non-life, then the population obviously began below 50,000. Therefore, if evolution occurred, it needed a different mechanism than the one currently claimed to push populations above that limit. Like I said, just my own speculation that I haven't found an answer to yet. But, at the very least I think I've demonstrated that their is on-going work on species stasis. In fact, a further and more recent reference would be "Optima for Animals" by R.M. Alexander. In that book, Alexander proposes a mathematical model for evolution. At the end of the book, he talks about the difficulties with his method. He states, "The next problem, after deciding what is likely to be optimized, is to decide what structures or strategies are possible, and what constraints apply. If no such limitations were recognized it would have to be concluded that optimum structure would make bones unbreakable and without mass, and an optimum life-history would involve immortality and infinite fecundity."
It sounds to me like Alexander is saying that if evolution is to be viewed as an optimization problem, then it must have limits. He says, "Problems usually have to be posed in ways that allow only a limited range of answers." The rub, then, is determining what those limits are. With respect to that, he further states that, "Constraints are often not explicit in optimization models, but implicit in
assumptions."
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So, then, we come to #3. Suppose aliens find one of our Voyager probes floating in space (hmm, wasn't that a Star Trek movie?). Alien A claims that it was intelligently designed while alien B claims it arose by natural processes. It would bolster the case of alien A if a human were to appear on the scene and say, "Yes, we designed that." But it might remain difficult for alien A to convince alien B if only he had the encounter.
Such is the nature of experiential evidence. My spiritual experiences leave me without doubt that God exists. Whether I tell them to you or not, those experiences will not be convincing. You would need to have your own experience. Yet the evidence is there.