So there we go, words from the man himself!

I was the one making the suggestion about a relatively simple selection pressure, with an accompanying cluster of traits, as a different way to think about human/cultural evolution. As you indicated, sometimes the trait-specific adaptationism becomes the dominant mode of evolutionary analysis.

For something like culture, particularly its more systemic and integrative aspects, it might prove productive to think about “joint variation” as a better evolutionary model. That still leaves open what specific selective pressures acted when (it’s not just one over two million years, that’s for certain). But a bundled approach to cultural evolution, with a focus on basic selective advantages (mordibity, mortality, foraging, social relations, kin selection), is a different model than trait-specific adaptationism and modeling biological and cultural evolution separately.

Looking at the video again, I agree that certain things are related to the environmental feedback, such as going into the home and responding to names. And those things jump out at us, because they make the foxes seem even more dog-like. But I wouldn’t want to place it all on early feedback.

I do think there are different genetic patterns in the feral and domesticated foxes as well (likely more in terms of expression than changed code…?). Much of that is due to an experience at my sister’s farm. Yes, I am going to use an anecdote!

At that time my sister had some pet rats, very white, quite friendly and tame. During some construction in her barn, a wild rat’s nest got exposed. The mother rat took off, and there were some newborn rats.

My sister decided to “take in” these barn rats, and initially kept them in a large feed tin with a lid. I remember how bristly their fur was, such a sharp contrast to the soft white coat of the domesticated rats.

Each time someone would take the lid off, the group of baby rats would be huddled together in the middle of the bin. But with the noise and light, they would immediately shoot at full speed to the sides of the bin. That same “flight response” as in the foxes.

A very adaptive response when faced with a large animal that is both a predator and capable of crushing a rat underfoot. And completely different from the way her tame rats acted. The Balyaev video captured the same thing for me, but with foxes.

As you say, we likely domesticated ourselves. That’s a very different way of thinking than proposing the adaptive features of culture or religion, as if these were somehow separate from people themselves. It’s also different from proposals of social or Machiavellian intelligence and the runaway human brain.

But to go back to Gregory Bateson, in selective terms, what was the difference that made a difference? If we get this suite or cluster of traits and effects bundled together, what was the specific adaptive component? It certainly is something fun to think about.

But I’m struck by what Rilling suggests, and I think Belyaev’s foxes sort of demonstrates something contrary to what she is saying (or at least, one way that I might be interpreting what she’s saying). That is, Belyaev got this sort of behaviour by relatively simple selective mechanisms; he simply screened for response to the glove in the cage, whether an animal was aggressive or fearful, or whether it was calm or curious. The foxes did not start out ‘domesticated’; they became domesticated through this selection process. He ran the same sort of selection a few times, and in ten years (I don’t know how many fox generations), he got this cluster of different traits, all brought on by the simple selective mechanism of ‘if you bite me, you don’t breed.’

The foxes became ‘wired’ this way through this selection process. In addition, the immature foxes, with a different set of initial response patterns (or instincts) started to get abundant feedback in relation to the new early profile. Because they didn’t bite humans when young, they didn’t have to be in cages, they got to run around, they got scratched and cuddled by humans, etc. The opposite can happen with a domesticated animals that is neglected and ‘goes feral.’ Genes are the same, and the animal likely had the early developmental patterns of a domesticated animal, but the subsequent experience (and lack of ‘domestic’ behaviour reinforcement cycles), and the animal goes feral (though not exactly back to ‘wild,’ of course).

So if Rilling is saying that humans come into the world pre-destined for cooperation, I would disagree with this. We know that feral children, neglected children, abused children, and some others can wind up very ‘un-cooperative.’ They’re no less ‘human’ because of this, of course, but they may have started with the same early developmental behaviour patterns, the same mechanisms that produce a proclivity for cooperation in most human adults (though not all), but they didn’t come to a normal profile because the support and response patterns in the environment were not cultivating this trait.

In other words, I suspect that we, like Belyaev’s foxes, are ‘domesticated’ animals — it’s just that we do it to ourselves. We have lots of other traits of domestic animals that point to this same conclusion (such as high body fat, under-developed flight and fight responses, exaggerated curiosity, some juvenile physiological traits that continue into adulthood like the floppy ears of Belyaev’s foxes, etc.).

Although I like your reference to Berlin’s discussion of foxes and hedgehogs, I think it’s also appropriate to talk about Gould’s criticism of the trait-specific adaptationism of many evolutionary theorists that he wanted to criticize. That is, a lot of evolutionary theorists — especially those from fields outside of evolutionary science (I won’t name names, but our readers know the Usual Suspects) — tend to think of an organism as a collective of discrete and disarticulated traits, each one of which is independently selected for. Organismal biology clearly shows that traits are not isolated and independent, but often vary jointly in intriguing ways, like ‘tameness’ and colour, ear shape, and facial structure in foxes. Although a trait may offer a selective advantage, natural selection acts on the organism as a whole, so the ‘package’ of linked traits either gets passed on or not. The fox doesn’t get to pick which trait it keeps; all those bundled with the trait that gets selected (in this case, artificially) wind up tagging along for the evolutionary ride.

What a great video though. I’m sure to use it when I teach this semester. Thanks a ton for pointing it out.