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Uniquely Human: The Evolution of Speech, Thought, and Selfless Behavior Revised ed. Edition
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Lieberman has distilled the best of his twenty-five years of accumulated wisdom about man's unique gift of speech and has presented it here in much too readable a form to be limited to experts. I hope it reaches the broad audience it deserves. (George Miller, Princeton University)
From the Back Cover
In a stimulating synthesis of cognitive science, anthropology, and linguistics, Philip Lieberman tackles the fundamental questions of human nature: How and why are human beings different from other species? Can the Darwinian theory of evolution explain human linguistic and cognitive behavior? How do our language and thought processes differ from those of Homo erectus 500,000 years ago? What accounts for human moral sense? Uniquely Human will stimulate fresh thought on the basic question of how we came to be.
Top Customer Reviews
Briefly, Lieberman argues first that language and speech must have co-evolved (as opposed to the capacity for language coming first, perhaps being used in gestural modalities before the capacity for speech came about). The reasons for this are complex, but the gist of it is that a supra-laryngeal vocal tract that permits formation of the sounds of human speech is such a non-survival characteristic (adult humans are the only mammals incapable of breathing and drinking simultaneously (thus also rendering infants subject to SIDS in the period when the larynx drops), small mouth and small teeth make us work harder to ingest food, etc.) that it would never have evolved at all if the capacity to use language had co-evolved with some other adequate modality of language use. In addition, general principles of natural selection tell us that the cognitive capacity for language (probably) did not evolve independent of an ability to use language.
Next, Lieberman argues that the cognitive capacities that make language possible are the very same ones that make possible all of the cognitive "feats" that we consider to be particular to humankind: creativity and innovative thought, as well as our highly-developed hand-eye coordination and digital manipulation abilities.
In my view -- but not Lieberman's -- the third part of his argument is something of an afterthought, not a necessary part of his theory and more speculative than data-driven.Read more ›
He states in the Introduction to this 1991 book, "apes cannot form grammatical sentences. Although they can acquire a limited vocabulary by using sign language, they are incapable of grasping the rules of syntax that even three-year old children master. Nor do chimpanzees or other animals ever create works of art or complex devices, or convey 'creative' thoughts. Nor do they, in their natural state, adhere to the most basic aspects of higher human moral sense. In the chapters that follow, I shall try to demonstrate that human language is a comparatively recent evolutionary innovation that added two powerful devices, speech and syntax, to older communication systems."
He later writes, "Syntax is clearly species-specific. No other living animals, including language-trained apes, have been able to master anything but the very simplest syntactic rules. The syntactic abilities of the most proficient ASL-using chimpanzees are surpassed by human three-year olds; by age four or five humans can produce an infinite number of new sentences."
He also observes, "(P)resent data on chimpanzees living in the wild do not show any evidence that clearly indicates that they use words. What chimpanzees clearly do not seem to be able to acquire is the complex syntax of ASL. Careful observations of chimpanzee lanaguage using ASL and other modalities ... show that syntactically significant word order is usually not preserved. A chimpanzee who by all appearances intends to sign 'tickle me' is just as likely to sign 'me tickle.'"