Posts Tagged ‘octopuses’
octopuses r n t us
I watched a video yesterday on those amazing sea creatures and was reminded of a couple of books I read a few years ago by Peter Godfrey-Smith, Other minds: the octopus and the evolution of intelligent life, and Metazoa: animal minds and the birth of consciousness. Yes, again it’s about being engrossed and then more or less forgetting everything, so this time I won’t go on about myself and focus solely on octopuses. There are around 300 species of these shape-and-colour-shifting cephalopods, ranging in size from the Giant Pacific (the largest ever found weighing at about 270 kgs) to the Octopus wolfi (less than a gram). Which makes me wonder, how smart could such a mini-octopus be…?
Octopuses have been living in our oceans for some 300 million years, pre-dating the dinosaurs. They are invertebrates, i.e no backbone, but they do have hard beaky bits, the only part that can’t shape-shift. They’re famously solitary, living in home-made rock shelters, or shells or crevices – in fact in all sorts of innovative hideaways, and they’re not very long-lived at all, for all their smarts. The Giant Pacific lasts about five years at most, others not so much. Basically, they live to breed, then they die – males and females alike. Talk about a mind-blowing orgasm. This is called semelparity, which contrasts with iteroparous us. There are sex-based differences though, in this senescence. The females guard their eggs for a while, wasting away and generally dying just as the eggs hatch. This wasting process is similar in both sexes (though sometimes the male is killed by the female), and is brought about by secretions of the optic gland, ‘an endocrine gland located near the optic lobes, between the brain and eyes’, according to AI, which doesn’t lie. Anyway, this death-on-giving-birth system ensures, if that’s the word, that every new-born octopus is an orphan. Nothing is learned from their parents. They have to rely on their own smarts.
So what’s most interesting about them, surely, is the stuff that makes them think, from the get-go. It’s not a brain, in the mammalian or birdian sense, it’s a kind of decentralised nervous system. They do have a brain, of sorts, but they have eight other ‘arm-brains’. So each arm works separately but they must also be co-ordinated for the creature to get anywhere. Hard to work all that out, but then they’ve had 300 million years to do it. As to how many neurons they have, you can imagine, with the vast difference in species sizes, that it varies considerably. The common octopus, Octopus vulgaris, has about the same number as a dog, two-thirds of which are in the arms, the rest in the head. Nine brains, sort of. It has the largest brain-to-body mass of any invertebrate, unsurprisingly. They’re very visual, and can distinguish human faces, and even make friends with them, sort of. The award-winning documentary ‘My octopus teacher’ apparently demonstrates this (I haven’t seen it, but I will, and I’ve watched a documentary on the documentary, and even that was an emotional experience).
So octopuses can be added to the list of smart, even super-smart critters, but there’s something very very different about them, it seems to me. They’re solitary, and this doesn’t seem to be emphasised enough. They’re orphans, effectively. Of course they mate, because it takes two, but they don’t have mates in the Aussie sense.
Think of what this means. They don’t have parents, or siblings, or relatives – at least not that they know of, though the giant Pacific octopus lays tens of thousands of eggs before it drops dead. They don’t have playmates or teachers. Nothing is passed from generation to generation. Nothing is accumulated. They have no society. Remember the apocalyptically imbecilic remark of Margaret Thatcher, ‘there’s no such thing as society’? Maybe she’d mistaken herself for an octopus. For me, it’s due to the society that I live in that I can write on this laptop, or that I can read or write at all. Through my society I’ve learned something about the ancient Egyptians and Minoans, about Plato and Aristotle, about Voltaire and Diderot, Newton and Maxwell, Planck and Einstein. I’ve learned to play and appreciate the skills of soccer, pool and table tennis. I’ve learned of the joys and miseries associated with countless alcoholic beverages, and the odd not quite licit drug. I’ve driven cars, flown in planes, studied at a university, and sampled many other pleasures, as well as pitfalls, that my WEIRD world has provided. All, or most, of this stuff was around before I was born. They were the accumulations of our culture, part of what all we humans plug into. Octopuses, living and dying for hundreds of millions of years, have had none of that. To survive, they’re still doing what they were doing when our ancestors were synapsid tetrapods, likely sharing their oceans. And of course, they may well survive us. But have they had as much fun?
References
Peter Godfrey-Smith, Other minds: the octopus and the evolution of life, 2017
the short life and strange brains of the octopus, and other thoughts
a meeting of minds?
Canto: So we’ve been reading about the strange world of the octopus, and her fellow cephalopods, the squid and the cuttlefish, and what they might tell us about other intelligent forms of life. So what might they?
Jacinta: This is quite a new field of investigation, but certainly an exciting one. The octopus appears to be the most intelligent invertebrate on earth, though we still have lots to learn about it, and we know even less about its cephalopod cousins.
Canto: And we need to be careful about the ‘it’ word, as there are at least 300 species of the beasties, which vary considerably in size, habitat and even quite possibly in life-span.
Jacinta: Yes, some octopuses appear to have very short life-spans, a mere two years, but so little is known about so many of the deeper water species out there…
Canto: They’re predators, of course, feeding mainly on crabs, but some of the shallow-water species are known to scavenge off human activities, stealing bait and the like. They have incredibly flexible, almost amorphous bodies that aren’t co-ordinated simply by a central brain. In fact their nervous systems are still very much a source of mystery.
Jacinta: Like our own. Well, okay we know a helluva lot more about ours. Some other facts: they have three hearts, their eight arms or tentacles are made up of four pairs, they’re all more or less venomous, they’re famously able to match their colour to their surroundings pretty well instantly, they can unscrew the lids of jars to get at the contents, some species collect shells to use as constructions around their homes, they have very high brain-to-body mass ratios, and they appear to be very quick to learn new stuff.
Canto: Apparently tentacles are out, they’re called arms. Tentacles are another thing. A cuttlefish has two tentacles and eight arms. Snails have tentacles. As to the brain and nervous systems of octopuses, here’s what we know. Two thirds of its neurons are to be found in its arms, and they can allow the arms to act independently to some extent. Interestingly, although octopuses have complex motor systems, they don’t have an internalised map of the body as vertebrates apparently do. It’s called a somatotopic map, and it’s found in humans in the primary somatosensory cortex, at the top of the brain. Octopuses’ brains/nervous systems are organised quite differently, and that’s the point – their relationship to us on the evolutionary bush is very distant indeed.
Jacinta: Yes, that’s exactly what makes them fascinating – they’ve evolved a complex nervous system on a completely different plan, like aliens.
Canto: Not quite – they still have neurons after all, and DNA. But the link between humans and octopuses probably goes back at least 500 million years, to some of the earliest complex life forms.
Jacinta: Not so complex by modern standards…
Canto: Indeed, something like a sea worm or sea sponge. Anyway, although they appear to have highly developed intelligence, their learning capacity is really hard to ascertain. They’re not highly social animals like many primates and cetaceans are, and they certainly don’t learn from their parents, since both parents ‘fall apart’ and die shortly after breeding.
Jacinta: They’re quite inventive, even playful, they’ve been observed pushing objects into circular currents and catching them. They also board fishing boats in search of food and find ways of getting out of lab aquariums. Their ability to flatten and elongate or bunch up when required makes them very slippery little suckers, you always have to keep an eye on them.
Canto: Well no doubt researchers will be keen to learn more about their neurology, but this relatively new understanding of their smarts raises questions about their treatment by researchers – not to mention eating them en masse.
Jacinta: Well just sticking with lab treatment, I remember reading in The Lab Rat Chronicles how the rather complacently cruel treatment of lab rats, and all experimental animals, is being questioned more and more, leading to the use of less invasive neurological and other operational approaches..
Canto: Which would in any case be a good thing – the more we can learn without destroying the living thing we’re seeking to learn about, the better, for obvious reasons.
Jacinta: Rats are really smart animals – and just about the most successful animals on the planet – and they certainly feel pain and become depressed, and it’s clear that octopuses do too. In fact some countries have rules against surgical procedures without anaesthetic for octopuses, presumably based on a growing body of knowledge about them.
Canto: They often lose an arm to predators – which by the way they’re able to regrow – and have been observed to favour and tend to damaged or lost arms and other parts, which is a clear sign of ‘feeling’ the damage. But really, the idea that animals don’t feel pain – any animal – has surely had its day.
Jacinta: So what about eating them? I gather that in some parts, eating them live is a thing.
Canto: Well I’ve always been of two minds about this, about eating other animals. And Peter Wohlleben argues for the smartness and the communal life of trees and plants, so that doesn’t leave us with anything to eat at all, if we’re being truly sensitive to others. But there’s no doubt we’re eating too much, we’re destroying the habitats of huge number of species, on land and sea, to feed our growing and increasingly voracious human population. Nobody knows how that’s going to end, though some are hoping, as ever, for technological fixes – artificial meat, ways of creating bumper harvests using less and less land and so forth.
Jacinta: Another whole realm of discussion, but getting back to octopuses, can they tell us anything about consciousness, given their vastly different origin, compared to us?
Canto: Well I don’t want to get into consciousness now – that’s such a massive subject – but they can tell us a lot about a different neurological system, obviously. The fact is, though, that we observe whales, crows, elephants, octopuses, rats and other creatures that are vastly different from each other behaving in ways we, in our indulgent and sometimes condescending manner, consider intelligent, but we know barely anything about, to paraphrase a philosopher, what it’s like to be any of those creatures. Do they have thoughts like us? Or do they have thoughts, but nothing like our own? Which of course raises the question, what exactly is a thought? Can it be reduced to brain processes or do we lose too much in the reduction? Will our endless and increasing probing of human and other brains definitively answer this question?
Jacinta: I think we’ll have to wait till after we die to find out…
References
Other minds: the octopus and the evolution of intelligent life, by Peter Godfrey-Smith
https://en.wikipedia.org/wiki/Octopus
https://onekindplanet.org/animal/octopus/