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Language is endlessly variable.
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Each of us can come up with an infinite
number of sentences
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in our native language,
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and we’re able to do so from an early age—
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almost as soon as we start to communicate
in sentences.
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How is this possible?
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In the early 1950s, Noam Chomsky proposed
a theory
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based on the observation that the key to
this versatility seems to be grammar:
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the familiar grammatical structure of an
unfamiliar sentence
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points us toward its meaning.
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He suggested that there are grammatical
rules that apply to all languages,
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and that the rules are innate—
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the human brain is hardwired to process
language according to these rules.
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He labelled this faculty
Universal Grammar,
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and it launched lines of inquiry that
shaped both the field of linguistics
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and the emerging field of cognitive
science for decades to come.
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Chomsky and other researchers
set out to investigate
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the two main components
of universal grammar:
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first, whether there are, in fact, grammar
rules that are universal to all languages,
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and, second, whether these rules are
hardwired in the brain.
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In attempts to establish the universal
rules of grammar,
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Chomsky developed an analytical tool
known as generative syntax,
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which represents the order of words in a
sentence in hierarchical syntax trees
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that show what structures are possible.
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Based on this tree, we could suggest a
grammar rule
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that adverbs must occur in verb phrases.
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But with more data, it quickly becomes
clear
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that adverbs can appear
outside of verb phrases.
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This simplified example illustrates a
major problem:
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it takes a lot of data from each
individual language
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to establish the rules for that language,
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before we can even begin to determine
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which rules all languages might
have in common.
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When Chomsky proposed universal grammar,
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many languages lacked the volume of
recorded samples necessary
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to analyze them using generative syntax.
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Even with lots of data,
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mapping the structure of a language
is incredibly complex.
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After 50 years of analysis, we still
haven’t completely figured out English.
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As more linguist data was gathered
and analyzed,
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it became clear that languages around the
world differ widely,
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challenging the theory that there were
universal grammar rules.
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In the 1980s, Chomsky revised his theory
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in an attempt to accommodate
this variation.
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According to his new hypothesis of
principles and parameters,
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all languages shared certain grammatical
principles,
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but could vary in their parameters,
or the application of these principles.
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For example, a principle is “every
sentence must have a subject,"
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but the parameter of whether the subject
must be explicitly stated
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could vary between languages.
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The hypothesis of principles and
parameters
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still didn’t answer the question of which
grammatical principles are universal.
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In the early 2000s, Chomsky suggested
that there’s just one shared principle,
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called recursion, which means structures
can be nested inside each other.
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Take this sentence,
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which embeds a sentence within a sentence
within a sentence.
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Or this sentence, which embeds a noun
phrase in a noun phrase in a noun phrase.
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Recursion was a good candidate for a
universal grammar rule
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because it can take many forms.
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However, in 2005 linguists published
findings
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on an Amazonian language called Piraha,
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which doesn’t appear to have any
recursive structures.
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So what about the other part of
Chomsky’s theory,
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that our language faculty is innate?
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When he first proposed Universal Grammar,
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the idea that there was a genetically
determined aspect of language acquisition
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had a profound, revolutionary impact.
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It challenged the dominant paradigm,
called behaviorism.
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Behaviorists argued that all animal and
human behaviors, including language,
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were acquired from the outside by the
mind, which starts out as a blank slate.
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Today, scientists agree that behaviorism
was wrong,
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and there is underlying, genetically
encoded biological machinery
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for language learning.
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Many think the same biology responsible
for language
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is also responsible for other
aspects of cognition.
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So they disagree with Chomsky’s idea that
there is a specific, isolated,
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innate language faculty in the brain.
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The theory of universal grammar
prompted the documentation and study
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of many languages that hadn’t
been studied before.
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It also caused an old idea to be
reevaluated and eventually overthrown
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to make room for our growing understanding
of the human brain.