Thestudy challenges th idea that the “language centres” of our brains are the sole driver of language
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A long-standing idea that human languages share universal features that are dictated by human brain structure has been cast into doubt.
A study reported in Nature has borrowed methods from evolutionary biology to trace the development of grammar in several language families.
The results suggest that features shared across language families evolved independently in each lineage.
The authors say cultural evolution, not the brain, drives language development.
At the heart of both studies is a method based on what are known as phylogenetic studies.
Lead author Michael Dunn, an evolutionary linguist at the Max Planck Institute for Psycholinguistics in the Netherlands, said the approach is akin to the study of pea plants by Gregor Mendel, which ultimately led to the idea of heritability of traits.
“By looking at variation amongst the descendant plants and knowing how they were related to each other, [Mendel] could work out the mechanisms that must govern that variation,” Dr Dunn explained to BBC News.
“He inferred the existence of some kind of information transfer just from knowing family trees and observing variation, and that’s exactly the same thing we’re doing.”
Modern phylogenetics studies look at variations in animals that are known to be related, and from those can work out when specific structures evolved.
For their studies, the team studied the characteristics of word order in four language families: Indo-European, Uto-Aztec, Bantu and Austronesian.
They considered whether what we call prepositions occur before or after a noun (“in the boat” versus “the boat in”) and how the word order of subject and object work out in either case (“I put the dog in the boat” versus “I the dog put the canoe in”).
The method starts by making use of well-established linguistic data on words and grammar within these language families, and building “family trees” of those languages.
“Once we have those trees we look at distribution of these different word order features over the descendant languages, and build evolutionary models for what’s most likely to produce the diversity that we observe in the world,” Dr Dunn said.
The methods use inference in a similar way to Mendel’s studies of pea plants
The results showed that, although grammatical features were shared across the families, the way that the features arose depended strongly on the history of development of language features within the families.
In a parallel to convergent evolution in biology – in which analogous structures in unrelated animals can evolve independently – grammatical constructs follow their own independent evolutionary paths.
“We show that each of these language families evolves according to its own set of rules, not according to a universal set of rules,” Dr Dunn explained.
“That is inconsistent with the dominant ‘universality theories’ of grammar; it suggests rather that language is part of not a specialised module distinct from the rest of cognition, but more part of broad human cognitive skills.”
The paper asserts instead that “cultural evolution is the primary factor that determines linguistic structure, with the current state of a linguistic system shaping and constraining future states”.
However, co-author and evolutionary biologist Russell Gray of the University of Auckland stressed that the team was not pitting biology against culture in a mutually exclusive way.
“We’re not saying that biology is irrelevant – of course it’s not,” Professor Gray told BBC News.
“But the clumsy argument about an innate structure of the human mind imposing these kind of ‘universals’ that we’ve seen in cognitive science for such a long time just isn’t tenable.”
Steven Pinker, a cognitive scientist at Harvard University, called the work “an important and welcome study”.
However, Professor Pinker told BBC News that the finer details of the method need bearing out in order to more fully support their hypothesis that cultural boundaries drive the development of language more than biological limitations do.
“The [authors] suggest that the human mind has a tendency to generalise orderings across phrases of different types, which would not occur if the mind generated every phrase type with a unique and isolated rule.
“The tendency may be partial, and it may be elaborated in different ways in differently language families, but it needs an explanation in terms of the working of the mind of language speakers.”
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.

Hispanics became the largest minority group in 191 metro areas in 2010
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New figures by the US Census Bureau show Hispanics now outnumber African Americans for the first time in most metropolitan areas.
The figures, from the 2010 Census, illustrate the growing diversity of the 366 metro areas in the US, which are home to 83.7% of the US population.
Hispanics became the largest minority group in 191 of the areas last year.
The data could influence redistricting lines in many states, where political maps are drawn based on population.
The figures released on Thursday are important for the US political process because population determines the number of members a state has in the House of Representatives.
And states draw their own district lines, often taking ethnic voting into account.
That Hispanic populations have become the biggest minority groups in an increasing number of metropolitan areas – 191, up from 159 in the 2000 Census – is in part attributed to black populations moving south, leaving behind economically troubled cities in the northern part of the country.
“A greater Hispanic presence is now evident in all parts of the country”
William Frey Demographer at the Brookings Institution
New metropolitan areas where Hispanic populations rose include: Chicago, Illinois; Grand Rapids, Michigan; and Atlantic City, New Jersey – all regions that will lose US House seats in the 2012 elections because of overall population changes.
Last month, the Census Bureau said the total Hispanic population in the US jumped 42% in the last 10 years to 50.5m, the equivalent of one in six Americans.
Black populations increased 11% to 37.7m, or about one in 10 Americans.
“A greater Hispanic presence is now evident in all parts of the country – in large and small metropolitan areas, in the Snowbelt [northern states] and in the Sunbelt [southern states],” William Frey, a demographer at the Brookings Institution, told the Associate Press news agency.
He added: “From now on, local, state and national politicians will need to pay attention to Hispanics rather than treating blacks as the major minority.”
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.

Ali Isa al-Saqer is one of several detainees who died in police custody
Anti-government protests in Bahrain have been squashed but resentment of the Sunni monarchy simmers among the tiny Gulf kingdom’s Shia majority, reports the BBC security correspondent Frank Gardner in the capital, Manama.
Bahrain is now under what is officially called a state of national security – imposed last month when the government’s patience with protesters and their roadblocks snapped.
But it is martial law by any other name.
Police checkpoints are up all over the country, there are tanks stationed in the centre of the capital Manama, a curfew from midnight until early morning and more than 1,000 troops and police from neighbouring Arab Gulf states helping to guard vital installations.
That’s fine by us, say many Bahrainis from the ruling Sunni minority, as well as expatriates.
They feel reassured, not threatened, by the checkpoints that have replaced the protesters’ anarchic and intimidating roadblocks. But most Shia Muslims tell a different story.
In Manama’s suburb of North Sehla we went to a packed Shia funeral for one of several detainees to die in police custody.
Accused of trying to run over a policeman during a protest, Ali Isa al-Saqer had handed himself over to police after his family say they were threatened.
Six days later he died in their custody, they say he fought his jailers.
“Making an enemy of a whole section of the population who are now unemployed, angry and clever is not wise, it is sowing the seeds for future trouble”
Western diplomat in Bahrain
His family, seeing his battered body for the first time since his arrest, collapsed in howls of grief; his wounds were quite simply horrific.
Beaten black and blue, his lacerated back resembled a bloody zebra; he appeared to have been whipped with heavy cables, his ankles and wrists manacled.
I brought up his case with the health minister, Dr Fatima al-Beloushi, who is also minister for human rights.
At first she said that the opposition had altered the images to invent the lacerations. But when I replied that we had been to the funeral and seen them ourselves she immediately promised a full investigation.
Daniel Williams, a senior researcher with Human Rights Watch, told me after seeing Mr al-Saqer’s body: “If he had been in a car wreck he might have been better off.”
Opposition activists have frequently been prone to exaggeration, claiming wrongly for example that they were being fired on by helicopters.
But they are certainly suffering now.
Bahrain’s security forces are now out in force after weeks of protests
In the last few days the security apparatus appears to have stepped up its intimidation of anyone even suspected of opposition.
People are grabbed at two in the morning from their beds, beaten in front of their families then dragged away by heavily-armed masked men and taken off to unknown cells.
The family is rarely, if ever, told where.
More than 400 people have been detained this year. Four have reportedly died in custody.
Not surprisingly, this is inflaming large parts of the Shia community.
Coupled with this is an organised programme of humiliation of Shia by “baltajiya” – thugs who come at night and smash up community gathering places and spray pro-ruling family graffiti on the walls of Shia areas with antagonising phrases like “the al-Khalifa are a crown upon your head”.
Large numbers of people, mostly Shia, including doctors and other professionals, have recently lost their jobs, officially for absenting themselves from their jobs during the protests.
As one Western diplomat put it to me: “Making an enemy of a whole section of the population who are now unemployed, angry and clever is not wise, it is sowing the seeds for future trouble.”
On the island of Muharraq, just next to the capital, we found unease too among the Sunni community.
Roadblocks set up by anti-government protesters have been dismantled
At Friday prayers at this Sunni mosque we met a community largely supportive of the government’s crackdown.
Worshippers told me they welcomed the Saudi troops that Iran and many Shia have branded as “invaders”.
They said the protesters had gone too far, paralysing the country’s economy with their vigilante roadblocks.
I asked Sheikh Abdullatif Al-Mahmoud, the spiritual leader of Bahrain’s sizable Sunni minority, what he thought would happen if protesters from the Shia majority ever deposed the Sunni ruling family.
Sheikh Abdullatif al-Mahmoud, the spiritual leader of Bahrain’s sizable Sunni minority, warned of terrible consequences if the Shia majority ever deposed the Sunni ruling family.
“If they manage to seize power, Sunnis in Bahrain will suffer and we’ll see bloodshed and killings in Bahrain,” he told me.
For now, the country is holding its breath.
One month into the three-month state of emergency there are attempts to pretend everything is “getting back to normal” despite the sand-coloured armoured vehicles at junctions and a row of tanks guarding what used to be Pearl Roundabout, the now-bulldozed centre of the protests in February and March.
After losing patience with the opposition and their changing demands, the regime’s hardliners have got their security clampdown, the reformers have been sidelined and negotiations on political reform have stalled.
It is as if a lid has been clamped back onto a boiling pot, while at the same time the fire beneath it is being stoked.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.
