Stas Bush wrote:I'm just wondering about the extent of possible changes as a result of "their environment".
Maybe more than one might think. It's been
long established that simple lack of affection can have serious negative affects on a developing brain. Another example that I gave in another thread recently are the changes caused to the language areas of the brain by the learning of a child's primary language. These changes are what makes it
difficult for adults to
learna second language.
Stas Bush wrote:I think science has developed methods to discern aquired and un-aquired reflexes, did it not?
Well that's precisely what's in dispute here. Does the experiment described sufficiently discern acquired versus innate traits?
Stas Bush wrote:And if so, why would the researchers even want to misinform the public? <snip> The problem is, I take the statement about evolution in earlier species as correct and then think how could that become an aquired characteristic. The only possibility here is Lamarckism.
Just to clarify, I don't think the researchers are misleading the public, I just think the
Detroit Times article is written in a slightly misleading way (see below). But yes, if I were to take the entire article at face value I would of course concede that only Darwinian genetic evolution could result in the results described.
However, as far as I can tell from the article, Graf's brain experiments are not the same experiments that produced the rat results. Unfortunately the rat results aren't sourced in any way in the article and only vaguely described, so we can't check them to make sure they aren't just showing the results of kin selection. Nor can we verify that it isn't some sort of selfish reciprocal altruism, such as reciprocal altruism shown by meal-sharing in vampire bats wherein "debt" is levied against the borrower.
These are specific types of altruism but not the only ones we see in humans, who demonstrate uniquely non-selfish altruism. Example: I (and many other people) gave a significant amount of money to relief efforts after the big tsunami in SE Asia a few years back... none of the people helped by that are related to me in any way and I personally stood nothing to gain by it. This is only one example.
The
underlying roots of this sort of human altruism originate in earlier species (and are obviously passed on to humans via Darwinian genetics), but humans also demonstrate unique forms of non-kin altruism which we have built on... either through additional genetic changes or through memetic changes. Animal experiments that demonstrate non-kin altruism that doesn't have some other selfish root would of course force me to concede this point entirely, but the rat experiment mentioned in the article is unsourced and we can't check it.
Stas Bush wrote:If you say the experiment lacks controls, what sort of controls would definetely prove that it's non-aquired in such a case?
That's the rub. I can imagine controls that
disprove that it's a non-acquired, but I have trouble doing the reverse. An easy one, which I mentioned earlier, would be to compare the brain results against brain scans resulting from other phenomena that we "know" don't have biological roots.
Check the results against similar brain scans undergoing profound religious experiences, for example. We certainly didn't inherit religious experience from our mammalian ancestors, but we nonetheless know that people "experiencing God" (
) show some pretty deep-rooted brain activity (apology here: I remember seeing the article on this board a while back but my Search-Fu fails me). Whether this is because the religious experience is hijacking that part of the brain or whether it's modified that part of the brain over years of indoctrination is up for dispute... but you can make the exact same argument for uniquely human forms of altruism as well.
If we extend the argument to the Hauser Dilemmas you brought up earlier, we run into another problem. These experiments rather conclusively demonstrate that human beings more-or-less all use the same methods of reasoning through moral dilemmas -- using the concepts of Utility combined with the Kantian imperative not to use individuals solely as a means to an end. The problem is that, away from the experiment, we obviously see a great many people not conforming to the experimental results in day-to-day life. This can only be explained if we assume that while human beings have a deeply-rooted biological basis for our altruistic behavior, that we are also affected by our environments to a great enough extent to modify this behavior... unfortunately often to bad ends.