Shunya's Notes

The Inner Lives of Animals

(Cross-posted on 3 Quarks Daily, where it has received many comments.)

It is often said that humans are the only animals to use symbols. So many other claims of human uniqueness have fallen away—thoughts, emotions, intelligence, tool use, sense of fairness—what's so special about symbols, you ask? I share your skepticism, dear reader, and in the next few paragraphs I'll tell you why.

Let's begin by clarifying what "symbol" means here. One way to do this is to contrast symbols with signs. A sign, such as a red light, a grimace, a growl, or a thunderstorm, signifies something direct and tangible, making us think or act in response to the thing signified. Issuing and responding to signs is commonplace in Animalia. A symbol, on the other hand, is "something that represents something else by association, resemblance, or convention". A symbol allows us to think about the thing or idea symbolized outside its immediate context, such as the word "water" for the liquid, "7" for a certain quantity, and "flag" for a community. What is symbolized doesn't even have to be real, such as God, and herein lies the power of symbols—they are the building blocks of abstract and reflective thought. Evidence of material symbols used by humans dates back at least 60-100K years, when burial objects and decorated beads start to appear in archaeological finds. Linguistic symbols were almost certainly in use long before then.

According to Susanne Langer, symbols serve "to liberate thought from the immediate stimuli of a physically present world; and that liberation marks the essential difference between human and nonhuman mentality ... Words, pictures, and memory images are symbols that may be combined and varied in a thousand ways." It is only through symbolic thought that we imagine the past or the future—mental time-travel, including episodic memory, requires the use of symbols. Indeed, language is really a system of symbolic communication, combining words (which are symbols) and syntax. If non-human animals lack symbols, what and how do they really think?

Two Hundred Years of Surgery

Atul Gawande reviews the last two years years of the surgical profession, from the days before anesthesia and antiseptics (yikes!).

Consider, for instance, amputation of the leg. The procedure had long been recognized as lifesaving, in particular for compound fractures and other wounds prone to sepsis, and at the same time horrific. Before the discovery of anesthesia, orderlies pinned the patient down while an assistant exerted pressure on the femoral artery or applied a tourniquet on the upper thigh. Surgeons using the circular method proceeded through the limb in layers, taking a long curved knife in a circle through the skin first, then, a few inches higher up, through the muscle, and finally, with the assistant retracting the muscle to expose the bone a few inches higher still, taking an amputation saw smoothly through the bone so as not to leave splintered protrusions. Surgeons using the flap method, popularized by the British surgeon Robert Liston, stabbed through the skin and muscle close to the bone and cut swiftly through at an oblique angle on one side so as to leave a flap covering the stump.

The limits of patients' tolerance for pain forced surgeons to choose slashing speed over precision. With either the flap method or the circular method, amputation could be accomplished in less than a minute, though the subsequent ligation of the severed blood vessels and suturing of the muscle and skin over the stump sometimes required 20 or 30 minutes when performed by less experienced surgeons. No matter how swiftly the amputation was performed, however, the suffering that patients experienced was terrible. Few were able to put it into words. Among those who did was Professor George Wilson. In 1843, he underwent a Syme amputation — ankle disarticulation — performed by the great surgeon James Syme himself. Four years later, when opponents of anesthetic agents attempted to dismiss them as “needless luxuries,” Wilson felt obliged to pen a description of his experience:

The horror of great darkness, and the sense of desertion by God and man, bordering close on despair, which swept through my mind and overwhelmed my heart, I can never forget, however gladly I would do so. During the operation, in spite of the pain it occasioned, my senses were preternaturally acute, as I have been told they generally are in patients in such circumstances. I still recall with unwelcome vividness the spreading out of the instruments: the twisting of the tourniquet: the first incision: the fingering of the sawed bone: the sponge pressed on the flap: the tying of the blood-vessels: the stitching of the skin: the bloody dismembered limb lying on the floor.

A 50-Year Plan for Energy

In this TED talk, Amory Lovins, an energy researcher, lays out a plan for a whole new private-sector energy industry that will save trillions while decimating fossil fuel use, creating jobs, reducing oil conflicts, and growing the economy. For more, visit ReinventingFire.com.

The Slow Explosion of Speech

In this review of James R. Hurford's The Origins of Grammar, Nick Enfield presents a significant viewpoint on how we humans, from a stage when our ancestors were without language, came to acquire language in all its modern complexity.

If you could travel back to a time around the dawn of humankind, and if you encountered a people there whose only form of language was a list of one-word interjections like Yuck, Wow, Oops, Hey!, No, and Huh?, would you say that these people were of a different species, not quite human? Would they be like today’s apes that simply don’t have it in them to fully acquire a modern human language? Or would they be the same as us only less well equipped for communication, like the eighteenth-century man who is every bit human but happens not to have been born in a world with telephones? If the latter were true, then language would be more technology than biology, more something we build than something that grows. It’s clear that the earliest humans did not possess language as we know it. The question is whether this was because language as we know it hadn’t yet been invented.

In James R. Hurford’s towering account of our species’ path from being once without language to now being emphatically with it, he proposes that just such a monophrase language of the Yuck/Wow variety was an important early human achievement. And, Hurford argues, while our earliest forms of language had no grammatical rules by which words were combined to form sentences, they were far from primitive call systems.

More here. Also see this 3QD thread for a discussion on language, syntax, and symbol use among animals, where I've weighed in too.