Showing posts with label holobionts. Show all posts
Showing posts with label holobionts. Show all posts

Friday, December 18, 2020

The Secret of the Human Eyes: How Evolution Shapes our Perceptions

 

 
This post is reproduced from my blog "The Proud Holobionts" where I explore how the new concept of "Holobiont" can find applications not only in biology, but in many fields dealing with complex systems, including the human economy, memetics, and ecosystems
 
 
The short movie abov, Vikaari, has recently appeared on the "Dust" site and I think has several interesting features, relevant to the concept of holobionts. 
 
It is very well done as a movie, although it is deeply contradictory in many aspects. For one thing, it is a narrative disaster. First, the movie tells you that the "Vikaari", children born without a visible iris in the eyes, are good people, while being the target of Nazi-like bad guys. Then, we see the Vikaari killing their pursuers using their psychokinetic powers in bloody and cruel ways, apparently without any regret. Needless to say, this completely destroys the narrative tension of the movie and leaves you totally baffled about what the filmmakers wanted to say.

Indeed, I think the filmmakers were badly confused on several planes. First of all, in their decision of presenting this "new race" of children as something that will replace current human beings, engaged in destroying their own planet. Is this a hope or a fear? Difficult to say, but surely evolution doesn't work in that way. 

And then, why the choice of iris-less eyes as a defining mark? It is rare that people consciously perceive the characteristics of the irises of their fellow human beings. But the shape of the iris tells us much of the genetic inheritance of a person. On this point, the film-makers got it right, although in reverse. A human being without a visible iris is not a modern human.
 
The iris is an easily modified, highly visible human trait. There is a whole genetic story in the human iris. From what we can say, light-colored eyes have been rare in the remote past, although DNA studies indicate that they already existed in the Mesolithic period. Curiously, Europe is the continent where, nowadays, light-colored eyes are most common. But it is only a few centuries ago that light-colored irises start to appear in paintings. If they had existed before, surely painters would have noted them and shown them in their paintings. Green eyes are a modern trait in Europe, they seem to come from Northern Asia. They do spread easily because they are a typical "epigamic" trait. They give a certain advantage in the sexual competition for mates. 
 
And then, there are limbal rings. The dark ring that surrounds the iris. Also a typical epigamic signal, they are likely to be a feature of the modern main organism of the human holobionts. Here you see the eyes of Sarah Brightman, a modern human specimen. Note the light green color and well detectable limbal rings. As epigamic signals go, Ms. Brightman is surely beaming them out loud and clear!
 

Note the difference from other mammalian eyes. Most animals, even our close relatives, the apes, have dark eyes, no limbal rings, and not even a large and well detectable sclera. You see it in the image: this (probably) female bonobo doesn't look at all like Sarah Brightman, although she also surely sends powerful epigamic signals to the males of her species. 
So, why do the Vikaari of the movie have no irises and no pupil? They are, actually, the specular version of the "black eyed people," characters of a recent horror movie. In both cases, filmmakers understood that the lack of sclera or of the iris is a characteristic of a creature that is not fully human. A new species (as in Vikaari) or an otherworldly evil creature (as in "Black Eyed Creatures"). No wonder that regular humans react with great perplexity and sometimes violently to these alien-looking creatures. And this violence is reciprocated in Vikaari
The existence of these films shows our limited understanding, and also limited tolerance, of what makes humans human. A small difference in the extent of the sclera or in the color of the iris is sufficient to turn otherwise fully human creatures into enemies, at least in these fiction pieces. But we all know very well that it happens also in the real world for other, no more important genetic traits, such as skin color. 
 
There is a thin line that separates the horrible from the attractive: nobody would be killed for having green eyes, but the white-eyed Vikaari could be if they existed for real. But that's the way evolution works. Sometimes gradually, sometimes in bumps. The human holobiont of the future will not be the same as it is now and it was in the past. It is the giant holobiont that we call the ecosphere that changes all the time. Onward, fellow holobionts!


Finally, for your curiosity, the "Statue of a Standing Nude Goddess," presently at the Louvre Museum and coming from excavations in the Middle East. Note the eyes without irises. It is not clear if that was a bug or a feature: once they had decided to use rubies for the eyes of this statuette, there was no way they could have shown irises and pupils. But maybe it was intentional: this figure may have been supposed to be somewhat otherworldly or even threatening. Note the horns on her head, a typical attribute of the Moon Goddess. Already at the time when it was made, probably the 2nd century CE, goddesses were rather unpopular and suspicious, not unlike our modern witches. 



Thursday, July 16, 2020

The End of an Age: The Great Failure of Catastrophism


Colin Campbell, the founder of the association for the study of peak oil and gas (ASPO). 



The considerations I develop below originate from a post by Michael Krieger where he describes how he is so dismayed by the reaction of the public to the current epidemic that he is closing his blog to rethink the whole matter over. You can read similar feelings in a post by Rob Slane of the "Blogmire" and of Chris Smaje on "Resilience." Many others are dismayed at how badly the COVID-19 crisis was managed: a threat that was real but, by all measures, not so terrible as it was described. Nevertheless, it generated an overreaction, more division than unity, political sectarianism, and counterproductive behaviors, and it ultimately led people to accept being bullied and mistreated by their governments and even to be happy about that.


by Ugo Bardi


The "peak oil movement" was started by a group of retired geologists around the end of the 1990s. It grew to include many kinds of scientists, including physicists, chemists, biologists, and others. You could call us "catastrophists," but catastrophe was not our goal. We were not revolutionaries; we never thought of storming the Bastille, giving power to the people, or creating a proletarian paradise. We were scientists; we just wanted society to get rid of fossil fuels as soon as possible, although we thought that the final result would be a more just and peaceful society. 

But how to reach this goal? Of course, we understood that humankind is a vague term and that people tend to seek for their personal well-being, rather than that of their fellow human beings. But we saw no reason why the people in power shouldn't have listened to our message. After all, it was in their best interest to keep the economy alive. So, the plan was to diffuse the message of resource depletion as a scientific message, not a political one. We did our best to produce models, to make studies, to convene meetings, to publish scientific papers. The very fact that our main talking point was a bell-shaped graph meant that we were speaking to the tip of the social pyramid. We knew (or at least we should have known) that most people cannot understand a Cartesian graph. There is a reason, after all, why in Excel the default graphical representation of data is a bar chart.

It was an utter failure. We might have expected it, but we were much better as scientists than as politicians. We thought we could speak to "the ear of the prince" as Niccolò Machiavelli had tried to do, centuries ago. He discovered, as we did, that the prince doesn't want counsel, he only wants obedience. The prince operates according to a time-tested strategy that goes as "scare them, then force them to obey." The commoners operate on an equally time-tested strategy that goes as "be scared and obey," or, at least, "pretend to be scared and pretend to obey."

So, what happened is that some threats were just ignored: peak oil, resource depletion, and now climate change. Instead, other threats were amplified beyond recognition and some elites used them as a chance to reinforce their power on other elites or on the commoners. That was the case of the recent coronavirus epidemic.

As a combination of overreaction and non-reaction, we are now facing the downward slope that I had termed the "Seneca Cliff," the start of a probably irreversible descent, at least for several decades. No wonder that many of us are dismayed. But how is it that the human society either overreacts or doesn't react to external perturbations? Compare with the behavior of a system such as a forest. It is a system in many ways as complex as the human economy (quite possibly, more complex) but it tends to reach and maintain a certain level of stability. Forests manage and conserve their resources, maintaining an incredibly complex diversity. And when a fire starts, the forest waits for it to burn out, and then it patiently re-colonizes the burned area. It is the way natural systems work -- today we tend to define with the term of holobionts. 

Why can't human systems behave in that way? Clearly, we have a lot to learn, especially on how natural holobionts evolved and attained their stability. Perhaps we are moving in that direction in any case. It is a question of natural selection, those entities which are unstable tend to disappear in favor of the more stable ones. Maybe human society naturally evolves in this direction, even though it will involve a lot of suffering and it will take a lot of time before we arrive there. Perhaps, we could think of some kind of "directed evolution," with the human intelligence used to turn society into a societal holobiont. But that's exactly what the catastrophists, peakers and the others, failed to attain -- evidently it is not easy. Whatever we do, in any case, we keep marching toward the future. And so, onward, fellow holobionts!


Who

Ugo Bardi is a member of the Club of Rome, faculty member of the University of Florence, and the author of "Extracted" (Chelsea Green 2014), "The Seneca Effect" (Springer 2017), and Before the Collapse (Springer 2019)