Two Little Girls–One Mind? June 2, 2011Posted by Nina Rosenstand in Current Events, Nina Rosenstand's Posts, Philosophy of Human Nature, Science.
Tags: Antonio Damasio, conjoined twins, craniopagus, mirror neurons
Two little girls in British Columbia will grow up as conjoined twins; they are craniopagus, connected at the head, sharing a part of their brain structure. Separating them is apparently not an option. That phenomenon, disturbing as it may be, is not in itself the reason why these little 4-year old girls are getting attention from cognitive neuroscientists. It is because they apparently share not only brain matter, but also sensory experiences:
Twins joined at the head — the medical term is craniopagus — are one in 2.5 million, of which only a fraction survive. The way the girls’ brains formed beneath the surface of their fused skulls, however, makes them beyond rare: their neural anatomy is unique, at least in the annals of recorded scientific literature. Their brain images reveal what looks like an attenuated line stretching between the two organs, a piece of anatomy their neurosurgeon, Douglas Cochrane of British Columbia Children’s Hospital, has called a thalamic bridge, because he believes it links the thalamus of one girl to the thalamus of her sister. The thalamus is a kind of switchboard, a two-lobed organ that filters most sensory input and has long been thought to be essential in the neural loops that create consciousness. Because the thalamus functions as a relay station, the girls’ doctors believe it is entirely possible that the sensory input that one girl receives could somehow cross that bridge into the brain of the other. One girl drinks, another girl feels it.
The girls surely have a complicated conception of what they mean by “me.” If one girl sees an object with her eyes and the other sees it via that thalamic link, are they having a shared experience? If the two girls are unique individuals, then each girl’s experience of that stimulus would inevitably be different; they would be having a parallel experience, but not one they experienced in some kind of commingling of consciousness. But do they think of themselves as one when they speak in unison, as they often do, if only in short phrases? When their voices joined together, I sometimes felt a shift — to me, they became one complicated being who happened to have two sets of vocal cords, no less plausible a concept than each of us having two eyes. Then, just as quickly, the girls’ distinct minds would make their respective presences felt: Tatiana smiled at me while her sister fixated on the television, or Krista alone responded with a “Yeah?” to the call of her name.
Although each girl often used “I” when she spoke, I never heard either say “we,” for all their collaboration. It was as if even they seemed confused by how to think of themselves, with the right language perhaps eluding them at this stage of development, under these unusual circumstances — or maybe not existing at all. “It’s like they are one and two people at the same time,” said Feinberg, the professor of psychiatry and neurology at Albert Einstein College of Medicine. What pronoun captures that?
The average person tends to fall back on the Enlightenment notion of the self — one mind, with privacy of thought and sensory experience — as a key characteristic of identity. That very impermeability is part of what makes the concept of the mind so challenging to researchers studying how it works, the neuroscientist and philosopher Antonio Damasio says in his book, “Self Comes to Mind.” “The fact that no one sees the minds of others, conscious or not, is especially mysterious,” he writes. We may be capable of guessing what others think, “but we cannot observe their minds, and only we ourselves can observe ours, from the inside, and through a rather narrow window.”
And yet here are two girls who can possibly — humbly, daily — feel what the other feels. Even that extraordinary dynamic would still put the girls on the continuum of connectivity that exists between ordinary humans. Some researchers believe that when we observe another person feeling, say, the prick of a pin, our neurons fire in a way that directly mimics the neurons firing in the person whom the pin actually pricks. So-called mirror neurons are thought to foster empathy, creating connections of which we are hardly aware but that bind us in some kind of mutual understanding at a neurological level.
The article, written by Susan Dominus (New York Times Magazine) who visited with the girls, includes several incidents that would indicate some form of shared sensory experience. I recommend that you read the rest of the article. The girls have not been studied extensively because of their young age, but if they remain healthy we may be treated to insight about one of the many ways of being human that just hasn’t been scientifically explored yet—the sharing of a mind…The philosophical implications of this phenomenon are overwhelming, to say the least.
Consciousness Explained? September 2, 2010Posted by Dwight Furrow in Dwight Furrow's Posts, Philosophy, Philosophy of Human Nature, Science, Uncategorized.
Tags: Antonio Damasio, Mind body problem
David Hirschman at Big Think summarizes recent views on the nature of consciousness:
Dr. Antonio Damasio, a neuroscientist from the University of Southern California who has studied the neurological basis of consciousness for years, tells Big Think that being conscious is a “special quality of mind” that permits us to know both that we exist and that the things around us exist. He differentiates this from the way the mind is able to portray reality to itself merely by encoding sensory information. Rather, consciousness implies subjectivity—a sense of having a self that observes one’s own organism as separate from the world around that organism.
“Many species, many creatures on earth that are very likely to have a mind, but are very unlikely to have a consciousness in the sense that you and I have,” says Damasio. “That is a self that is very robust, that has many, many levels of organization, from simple to complex, and that functions as a sort of witness to what is going on in our organisms. That kind of process is very interesting because I believe that it is made out of the same cloth of mind, but it is an add-on, it was something that was specialized to create what we call the self.”
It seems to me there is something missing from this all-too-brief summary of Damasio’s account. To have a self (and thus to be robustly conscious) is not just to be a “witness to what is going on in our organism” or to recognize that one’s own organism is separate from the world.
To be conscious is to have the felt sense that something matters—has significance or import. A sophisticated computer might know that it exists, that things around it exist, and that there is a difference between it and the world. But I doubt that such a machine would have a felt concern for something because it is not a biological organism with needs embedded in feeling states. Self-awareness is not merely a “witness” but an active sorter of what to attend to and what to ignore in light of what matters. It is hard to imagine a consciousness without this sorting ability.
For political commentary by Dwight Furrow visit: www.revivingliberalism.com
Earth Day is Rousseau Day, Part 2 April 22, 2010Posted by Nina Rosenstand in Ethics, Nina Rosenstand's Posts, Philosophy of Human Nature.
Tags: Antonio Damasio, compassion, Earth Day, empathy, Hobbes, Jean-Jacques Rousseau, Lord of the Flies
Last year I chose to mark Earth Day with a blog about Jean-Jacques Rousseau, because he, more than any other philosopher prior to the twentieth century, pointed attention to the value of wild nature as a remedy for what ails the “modern” human spirit. Not the contemporary, controversial concept of intrinsically valuable nature, because Rousseau thought in fundamental, anthropocentric terms, but still, for the 1700s, a completely new approach to nature as something intellectually and emotionally valuable rather than just a resource. And, as I mentioned a year ago, we can agree or disagree with Rousseau and the entire Earth Day/Environmental movement (and I disagree with plenty of Rousseau’s ideas,) but the fact remains that the focus on the value of nature, for us or in itself, has transformed and expanded the debate about ethics within the past 30 years.
This year I want to pay another visit and tribute to Rousseau, and I may as well do that on Earth Day, for the reasons stated above, and in the original blog piece. But today I want to focus on something other than the environment—although it also has to do with nature: human nature. Since Rousseau introduced the idea that the “State of Nature” ( a pre-social condition which we now recognize as a fictional concept, useful as a Rawlsian thought experiment, but not as a historical theory) was good and beneficial to humans, he was able to conclude that human nature was also fundamentally good; that childhood was a valuable, innocent time that should be cherished and not squandered; and that indigenous peoples living in harmony with nature were morally superior to people living in great civilizations. Nature heals, civilization corrupts…
And most of that has generally been considered a magnificent fantasy by a more cynical, modern time. We know there was never a completely pre-social Rousseau-type state of nature, because we know now that humans have lived in groups, with at least basic rules of behavior, even before we became human. We assume that indigenous peoples are usually not morally better or worse than citified people—we’re all just people. The upgrading of childhood to something intrinsically valuable is truly something Rousseau should get credit for, but without us necessarily adopting his rather peculiar ideas of how to raise children (or his habit of dumping his own at the orphanage…). But what about human nature being essentially good? In most of the twentieth century scholars as well as laypeople leaned toward the assumption that Hobbes was more right than Rousseau—we’re simply pretty rotten: selfish, aggressive, belligerent, and like the schoolboys in Lord of the Flies we will revert to that fundamental selfish aggression if the veneer of civilization wears thin. But now (as you probably will have noticed, from other blog entries here over the past three years) neuroscientists and evolutionary psychologists are teaming up with philosophers, and little by little creating a new view of human nature: we appear to be not nearly as selfish as previously assumed. We (or most of us) seem to have a natural capacity for empathy, and a reluctance to harm others. That doesn’t mean we can’t override that empathy and learn to follow orders to harm others (Milgram experiment, Stanford prisoner experiment), or simply look to our own advantage, but according to high-profile researchers such as Antonio Damasio the deeper human nature is one of compassion and empathy rather than blatant selfishness. And what did Rousseau say, in his 2nd Discourse, On the Origin of Inequality Among Humans (1754)?
There is another principle which has escaped Hobbes; which, having been bestowed on mankind, to moderate, on certain occasions, the impetuosity of egoism, or, before its birth, the desire of self-preservation, tempers the ardour with which he pursues his own welfare, by an innate repugnance at seeing a fellow-creature suffer. I think I need not fear contradiction in holding man to be possessed of the only natural virtue, which could not be denied him by the most violent detractor of human virtue. I am speaking of compassion, which is a disposition suitable to creatures so weak and subject to so many evils as we certainly are: by so much the more universal and useful to mankind, as it comes before any kind of reflection; and at the same time so natural, that the very brutes themselves sometimes give evident proofs of it….
…It is then certain that compassion is a natural feeling, which, by moderating the violence of love of self in each individual, contributes to the preservation of the whole species. It is this compassion that hurries us without reflection to the relief of those who are in distress: it is this which in a state of nature supplies the place of laws, morals and virtues, with the advantage that none are tempted to disobey its gentle voice: it is this which will always prevent a sturdy savage from robbing a weak child or a feeble old man of the sustenance they may have with pain and difficulty acquired, if he sees a possibility of providing for himself by other means: it is this which, instead of inculcating that sublime maxim of rational justice. Do to others as you would have them do unto you, inspires all men with that other maxim of natural goodness, much less perfect indeed, but perhaps more useful; Do good to yourself with as little evil as possible to others. In a word, it is rather in this natural feeling than in any subtle arguments that we must look for the cause of that repugnance, which every man would experience in doing evil, even independently of the maxims of education. Although it might belong to Socrates and other minds of the like craft to acquire virtue by reason, the human race would long since have ceased to be, had its preservation depended only on the reasonings of the individuals composing it.
We used to snicker at Rousseau and his romanticism. We used to dismiss these sentimental words as either naiive fantasies, or a shrewd preparation for his later social contract theory which had to be grounded in a concept that humans were fundamentally good. But now? The new alliance of neuroscientists, evolutionary psychologists and ethicists are presenting evidence that, indeed, a natural empathy predates rational thinking in the human brain. We may agree or disagree, and we (as I often do) may want to point out that even if empathy is primary, it doesn’t take the place of sound logic and common sense in determining our moral course of action. But we should recognize that the idea itself is not new: Rousseau introduced it to Continental Europe in 1754. (Was he the first one? No, David Hume—a friend of Rousseau’s for a while—had already published similar ideas about human natural empathy in 1740. But that’s another story!)