Percy's take on FOXP2 language gene?
b9oky at TTACS.TTU.EDU
Fri Sep 13 12:09:07 EDT 2002
I don't pretend to speak as a representative of Walker. Not a spot that
is proper or comfortable.
However, if someone has a question about the research on FOXP2, I will
be happy to shoot off my own mouth.
My initial response to this article is that FOXP2 and its mechanisms
while interesting, are no more interesting than genes that make possible
other body parts or functions involved in speech.
We can already produce mechanical speech with devices (robots, tape
recorders, synthetic speech chips) but none of those entities have a
language. Helen Keller produced speech before the event Walker liked to
consider. She was an effective robot, in other words. She changed after
she acquired language, becoming fully a person.
But I could be wrong...
marcus at loyno.edu wrote:
> I am pretty certain that Percy would have been fascinated by the research
> at Stanford, Oxford and elsewhere that may point to a relatively recent
> genetic base for human language/symbolic capacity.
> Does anyone--Ken Ketner?--have any ideas how Percy might have responded to
> this article by Nicholas Wade?
> The New York Times
> August 15, 2002, Thursday, Late Edition - Final
> SECTION: Section A; Page 18; Column 5; National Desk
> LENGTH: 703 words
> HEADLINE: Language Gene Is Traced To Emergence of Humans
> BYLINE: By NICHOLAS WADE
> A study of the genomes of people and chimpanzees has yielded a deep insight
> into the origin of language, one of the most distinctive human attributes
> and a critical step in human evolution.
> The analysis indicates that language, on the evolutionary time scale, is a
> very recent development, having evolved only in the last 100,000 years or
> so. The finding supports a novel theory advanced by Dr. Richard Klein, an
> archaeologist at Stanford University, who argues that the emergence of
> behaviorally modern humans about 50,000 years ago was set off by a major
> genetic change, most probably the acquisition of language.
> The new study, by Dr. Svante Paabo and colleagues at the Max Planck
> Institute for Evolutionary Anthropology in Leipzig, Germany, is based on
> last year's discovery of the first human gene involved specifically in
> The gene came to light through studies of a large London family, well known
> to linguists, 14 of whose 29 members are incapable of articulate speech but
> are otherwise mostly normal. A team of molecular biologists led by Dr.
> Anthony P. Monaco of the University of Oxford last year identified the gene
> that was causing the family's problems. Known as FOXP2, the gene is known
> to switch on other genes during the development of the brain, but its
> presumed role in setting up the neural circuitry of language is not
> Dr. Paabo's team has studied the evolutionary history of the FOXP2 gene by
> decoding the sequence of DNA letters in the versions of the gene possessed
> by mice, chimpanzees and other primates, and people.
> In a report being published online today by the journal Nature, Dr. Paabo
> says the FOXP2 gene has remained largely unaltered during the evolution of
> mammals, but suddenly changed in humans after the hominid line had split
> off from the chimpanzee line of descent.
> The changes in the human gene affect the structure of the protein it
> specifies at two sites, Dr. Paabo's team reports. One of them slightly
> alters the protein's shape; the other gives it a new role in the signaling
> circuitry of human cells.
> The changes indicate that the gene has been under strong evolutionary
> pressure in humans. Also, the human form of the gene, with its two changes,
> seems to have become universal in the human population, suggesting that it
> conferred some overwhelming benefit.
> Dr. Paabo contends that humans must already have possessed some rudimentary
> form of language before the FOXP2 gene gained its two mutations. By
> conferring the ability for rapid articulation, the improved gene may have
> swept through the population, providing the finishing touch to the
> acquisition of language.
> "Maybe this gene provided the last perfection of language, making it
> totally modern," Dr. Paabo said.
> The affected members of the London family in which the defective version of
> FOXP2 was discovered do possess a form of language. Their principal defect
> seems to lie in a lack of fine control over the muscles of the throat and
> mouth, needed for rapid speech. But in tests they find written answers as
> hard as verbal ones, suggesting that the defective gene causes conceptual
> problems as well as ones of muscular control.
> The human genome is constantly accumulating DNA changes through random
> mutation, though they seldom affect the actual structure of genes. When a
> new gene sweeps through the population, the genome's background diversity
> at that point is much reduced for a time, since everyone possesses the same
> stretch of DNA that came with the new gene. By measuring this reduced
> diversity and other features of a must-have gene, Dr. Paabo has estimated
> the age of the human version of FOXP2 as being less than 120,000 years.
> Dr. Paabo says this date fits with the theory advanced by Dr. Klein to
> account for the sudden appearance of novel behaviors 50,000 years ago,
> including art, ornamentation and long distance trade. Human remains from
> this period are physically indistinguishable from those of 100,000 years
> ago, leading Dr. Klein to propose that some genetically based cognitive
> change must have prompted the new behaviors. The only change of sufficient
> magnitude, in his view, is acquisition of language.
> An archive of all list discussion is available at <http://www.ibiblio.org/wpercy/hypermail>.
> Visit the Walker Percy Project at <http://www.ibiblio.org/wpercy>.
Kenneth L Ketner
Paul Whitfield Horn Professor
Institute for Studies in Pragmaticism
Texas Tech University
Lubbock, TX 79409-0002
806 742 3128
Office email: b9oky at ttacs.ttu.edu
Home email: ketner at arisbeassociates.com
Office website: http://www.pragmaticism.net
Personal website: http://www.wyttynys.net
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