Natural conversations of this sort are important to linguists, psychologists, sociologists, anthropologists and philosophers because they embody the complex, integrated whole of language in a way that no other manifestation of language does. Conversations are the apex of linguistic studies and sources of insight particularly because they are potentially open-ended in meaning and form. They are also crucial to understanding the nature of language because of their ‘underdeterminacy’ – saying less than what is intended to be communicated and leaving the unspoken assumptions to be figured out by the hearer in some way. Underdeterminacy has always been part of language.
As an example of underdeterminacy, look at the second line of the conversation between Sabatão and Bidu. Sabatão says to Bidu, ‘Let talk in our language.’ This is strange if one takes it literally, because they are already speaking in their language. In fact, these men would be hard pressed to carry on a natural conversation in Portuguese, because their knowledge of it is rudimentary, limited principally to bartering. Sabatão’s words presume something unstated. Sabatão is using these words to indirectly let me know that they will not use any Portuguese to converse because they know that I am trying to understand how they converse in their language and because they want to help me. None of this is spoken. Though underdetermined by the words, it is implicit in the context.
Likewise, in the line ‘Let’s remember how things were a long time ago’ there is shared knowledge of the general range of things they are trying to remember. What is up for grabs here? Rituals? Hunting? Relationships with other peoples? How long ago? Before the Americans came? Before the Brazilians came? A hundred generations? Both Bidu and Sabatão (or indeed any other Banawá) know what is being talked about, but this is not clear initially to someone from another culture.
Sabatão and Bidu are two of the eighty or so remaining speakers of Banawá, a language that has already helped the scientific community learn a great deal about human language, cognition, the Amazon and culture. Specifically, they have taught us about unusual sound structures and grammar, the ingredients and process for manufacturing poison for darts and arrows, their classification of Amazonian flora and fauna and their connections linguistically to other Amazonians. Such lessons naturally follow from working out the knowledge structures, values, linguistics and social organisation of different groups who, like the Banawás, have spent millennia mastering life in a particular niche.
Any community – whether it be the Banawás, the French, the Chinese, or Botswanans – uses language to build social ties between members of their community and others. Indeed, our species has been conversing for a very long time. All languages on earth trace their underdetermined, socially bonding, grammar-constrained, meaning-motivated expressions of thought back to early hominins, to Homo erectus and perhaps even earlier. Based on the evidence of Homo erectus culture, such as their tools, houses, village spatial organisation and ocean travel to imagined lands beyond the horizon, the genus Homo has been talking for some 60,000 generations – quite possibly more than one and a half million years. By now one would expect our species, after more than a thousand thousand years of practice, to be very good at language. And we would also expect the languages we have all developed over time to better fit our cognitive and perceptual limitations, auditory range, vocal apparatus and brain structures. Underdeterminacy means that every utterance in every conversation and every line in every novel and each sentence of any speech contains ‘blank spots’ – unspoken, assumed knowledge, values, roles and emotions – underdetermined content that I label ‘dark matter’. Language can never be understood entirely without a shared, internalised set of values, social structures and knowledge relationships. In these shared cultural and psychological components, language filters what is communicated, guiding a hearer’s interpretations of what another is saying. People use the context and cultures in which they hear language to interpret it. They also use gestures and intonation, in order to interpret the full meaning of what is being communicated.
Like all humans, the first Homo species to begin the long arduous process of constructing a language from scratch almost certainly never said entirely what was on their minds. That would violate basic design features of language. At the same time, these primordial hominins would not have simply made random sounds or gestures. Instead, they would have used means to communicate that they believed others would understand. And they also thought their hearers could ‘fill in the gaps’, and connect their knowledge of their culture and the world to interpret what was uttered.
These are some of the reasons why the origins of human language cannot be effectively discussed unless conversation is placed at the top of the list of things to understand. Every aspect of human language has evolved, as have components of the human brain and body, to engage in conversation and social life. Language did not fully begin when the first hominid uttered the first word or sentence. It began in earnest only with the first conversation, which is both the source and the goal of language. Indeed, language changes lives. It builds society, expresses our highest aspirations, our basest thoughts, our emotions and our philosophies of life. But all language is ultimately at the service of human interaction. Other components of language – things like grammar and stories – are secondary to conversation.
This point raises an interesting question about language evolution, namely who spoke first? Over the past two centuries a plethora of ancestors for humans have been proposed, from South Africa, Java and Beijing, to the Neanderthal Valley and Olduvai Gorge. At the same time, researchers have proposed several novel hominin species, leading to a confusing evolutionary mosaic. To avoid getting caught up in a morass of uncertain proposals, only three language-possessing species need to be discussed – Homo erectus, Homo neanderthalensis and Homo sapiens.
Few linguists claim that Homo erectus had language. Many, in fact, deny this. There is currently no consensus on when the first humans spoke. But there does seem to be some modern consensus on human evolution, the methods used and an overview of the evolution of our species’ physical and cognitive abilities. In The Descent of Man, Charles Darwin suggested that Africa might be the birthplace of humans because it is also the location of most apes. He reasoned (correctly) that humans and apes probably are closely related, sharing a common ancestor. Darwin wrote these prescient remarks prior to the major discoveries of early hominins (hominin refers to the genus Homo and their upright ancestors, such as Australopithecus afarensis). Another group of relatives, the hominids, are the great apes. This group includes humans, orang-utans, gorillas, chimpanzees, bonobos and their common ancestor. The cast in the story of human evolution includes the offshoots of Homo erectus, up to modern humans. To understand the relationships between some of these different species and whether or not they spoke, one must learn what is known about them.
Part of the controversy of human origins is the number of species of Homo that existed, but it is still necessary to understand the potential cognitive abilities of all hominins (based on brain size, tool kits and travel) before moving on to the significance of hominin migration for the evolution of human language. One can focus on physiology or culture or both, yet some of the most interesting evidence comes from culture.
Symbols (the association of largely arbitrary forms with specific meanings, such as using the sounds in the word ‘dog’ to mean canine) were the invention that put humans on the road to language. And for this reason we must understand not only how they came about, but also how they were adopted by entire communities and how they were organised. One proposal I discard is arguably the most influential explanation of the origin of human language of all time. This is the idea that language resulted from a single genetic mutation some 50–100,000 years ago. This mutation supposedly enabled Homo sapiens to build complex sentences. This is the set of ideas known as universal grammar. But a very different hypothesis emerges from a careful examination of the evidence for the biological and cultural evolution of our species, namely t
he sign progression theory of language origin. This phrase means simply that language emerges gradually from indexes (items that represent things they are physically connected to, such as a footprint to an animal) to icons (things that physically resemble the things they are used to represent, such as a portrait for the real person) and finally by creating symbols (conventional ways of representing meaning that are largely arbitrary).
Eventually, these symbols are combined with others to produce grammar, building complex symbols out of simple ones. This sign progression eventually reaches a point in language’s evolution in which gestures and intonation are integrated with grammar and meaning to form a full human language. This integration transmits and highlights the information that the speaker is telling the hearer about. It represents a crucial, though often ignored, step in the origin of language.
Because the evolution of language is such a hard problem, the earliest efforts to solve it predictably began rather badly. In place of data and knowledge, accounts relied on speculation. One popular idea was that all languages began with Hebrew, since it was believed that this was the language of God. Like this Hebrew-first speculation, many ideas were abandoned, although there were others that included kernels of good ideas. These have led, however circuitously, to the present understanding of language origins.
But a serious deficiency traced its way through all of these early efforts and a lack of evidence, in conjunction with an abundance of speculation, irritated many scientists. So in 1866 the Paris Linguistics Society declared that it would no longer accept papers about language origins.
The good news is that the ban has now been lifted. Contemporary work is somewhat less speculative and occasionally more firmly grounded in hard evidence than the work of the nineteenth and twentieth centuries. In the twenty-first century, in spite of the difficulties, scientists have finally managed to put together enough of the extremely small pieces of the language evolution puzzle to give a reasonable idea of how human languages came about.
Still, one of the greatest mysteries left to solve regarding the origin of language, as many have observed, is the ‘language gap’. There is a wide and deep linguistic chasm between humans and all other species. Communication systems of the animal kingdom are unlike human language. Only human languages have symbols and only human languages are significantly compositional, breaking down utterances into smaller meaningful parts, such as stories into paragraphs, paragraphs into sentences, sentences into phrases and phrases into words. Each smaller unit contributes to the meaning of the larger unit of which it is a part. For some, this language gap exists simply because humans are a special creature unlike any other. Others claim that the distinctiveness of human language was designed by God.
More likely, the gap was formed by baby steps, by homeopathic changes spurred by culture. Yes, human languages are dramatically different from the communication systems of other animals, but the cognitive and cultural steps to get beyond the ‘language threshold’ were smaller than many seem to think. The evidence shows that there was no ‘sudden leap’ to the uniquely human features of language, but that our predecessor species in the genus Homo and earlier, perhaps among the australopithecines, slowly but surely progressed until humans achieved language. This slow march taken by early hominins resulted eventually in a yawning evolutionary chasm between human language and other animal communication. Eventually, Homo species developed social complexity, culture and physiological and neurological advantages over all other creatures.
Human language thus begins humbly, as a communication system among early hominids not unlike the communication systems of many other animals, but more effective than a rattlesnake’s.
What if all eighty remaining speakers of Banawá died out suddenly and their bones were discovered only 100,000 years hence? Forgetting for now the fact that linguists have published grammars, dictionaries and other studies of the Banawá language, would their material culture leave any evidence that they were capable of language and symbolic reasoning? Arguably it would leave even less evidence of language than has been found for neanderthalensis or erectus. Banawá art (such as necklaces, basket designs and carvings) and their tools (including bows, arrows, blowguns, darts, poison and baskets) are biodegradable. So their material culture would disappear without a trace in much less than the 800,000 to 1,500,000 years that have passed since the appearance of the earliest cultures. Of course, it might be determined from soil usage that they had villages of a certain size, huts and so on, but it would be as difficult to extrapolate from the remnants of their artefacts that they had language, as it is to claim that many ancient hunter-gatherer groups did or did not have language. It is known that current populations of Amazonians have fully developed human languages and rich cultures, so care must be taken not to conclude prematurely that the absence of evidence about language or culture in the prehistoric record indicates that ancient human populations lacked these essential cognitive attributes. In fact, when we look closely, there is evidence that the earliest species of Homo did in fact have culture and did speak.
The solution to the mystery of human language origins begins with an examination of the nature and evolution of the only surviving linguistic species, Homo sapiens, or, as author Tom Wolfe puts it, Homo loquax: ‘speaking man’. There are several unique perspectives that mark the path of the evolution of language.
First, human language emerges from the much larger phenomenon of animal communication. Communication is nothing more than the (usually intentional) transference of information from one entity to another, whether this be the pheromonal communication of ants to other ants, the calls of vervets, the tail positions and movements of dogs, the fables of Aesop, or the writing and reading of books. Language is much more than information transfer, though.
The second perspective on the evolution of language derives from an examination from both the biological and cultural vantage points. How did the brain, the vocal apparatus, movements of the hands and the rest of the human body, in conjunction with culture, affect and facilitate language evolution? Too many accounts of language evolution focus on one or the other of these, the biological vs the cultural, to the exclusion of the others.
A final, and necessary, perspective may strike some as curious. It is to look at language evolution as a linguistic field researcher would. That perspective leads to two fundamental questions: how similar are the human languages that are spoken today and what does the diversity of modern languages reveal about the first human languages? These perspectives offer a useful vision of evolutionary milestones that mark the path of the first language of Homo species.
There are still additional questions to answer. Are gestures crucial to human languages? Yes, they are. Is a vocal apparatus identical to that of modern humans necessary for human languages? No. Are complex grammatical structures required for human languages? No, but they are found in many modern languages for a variety of reasons. Do some societies communicate less or use linguistic communication less than others? It seems so. Erectus might have been in possession of language yet nevertheless valued taciturnity.
Part One
The First Hominins
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Rise of the Hominins
The hand of the Lord was on me, and he brought me out by the Spirit of the Lord and set me in the middle of a valley; it was full of bones. He led me back and forth among them, and I saw a great many bones on the floor of the valley, bones that were very dry …
Ezekiel 37:1–2
CONTROVERSY IS OFTEN DIFFICULT to resolve. In June of 2011 a young mother, Casey Anthony, was on trial for the murder of her two-year-old daughter, Caylee Anthony. The prosecution supported its allegation that Casey murdered her daughter with evidence that her daughter’s body had been stored in the trunk of Casey’s car – a car only she had access to – for several days in 90-degree weather. They produced witnesses who claimed that they had smelled the stench of a decomposing body in the trunk of that car and also showed that there were
bugs in the trunk typical of those that would have swarmed and multiplied in the hot sun on a dead body. Grisly evidence, to be sure. But it sounds convincing. Had the trial stopped there, perhaps a guilty verdict would have been rendered.
First, however, the defence needed to plead their case. Of course, they called their own witnesses, including a forensic expert who argued that the smell people reported could have come instead from a bag of garbage that Casey had left in her trunk for more than a week (no one was defending her hygiene). Moreover, the forensic witness claimed that the bugs found in the trunk of Casey’s car were neither of the type nor in the quantity that would be expected if her car trunk had contained a decomposing body. Finally, after much more arguing back and forth between the experts and attorneys, the jury ultimately decided in favour of the defence. Twelve people found the defendant’s story sufficiently credible to raise reasonable doubt about what happened to Caylee.
The problem of reasonable doubt that faces some juries is also common in science. But the difference is that scientists, unlike jurists, thrive on reasonable doubt. This is because, like doubt, they are trying neither to convict theories, nor to exonerate them. Rather, scientists want to evaluate theories, rejecting those that have excess reasonable doubt, even if only temporarily. In other words, doubt is an intellectual tool that allows scientists to narrow down the number of theories they need to concern themselves with.
It is unsurprising that disagreement between experts occurs. In fact, consensus among experts often seems rarer than disagreement. Every scientific advance usually originates as a dispute concerning the interpretation of evidence for vs evidence against some thesis. Science is not about finding a ‘true’ theory. It is about finding the best theory, as scientists grope their way towards understanding.
How Language Began Page 2