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Title: Author Response: Review: How New Languages Emerge
Submitter: David Lightfoot
Description: In response to LINGUIST List Reviews issue:
http://linguistlist.org/issues/18/18-432.html#1

Like booing and jeering at sports events, negative reviews are part of the
culture of the humanities and social and behavioral sciences. A standard
technique is to describe a book the reviewer would like to have read.

Michael Arbib has written extensively on mathematics, models of the brain
and computational science but his website and publications indicate no
previous interest in language variation, acquisition or change. Not
surprisingly, he wanted a textbook on historical linguistics (actually, a
construction-based approach), providing a comparison of alternative
theories and an account of how work on historical phonology might develop.

Now there is a textbook on diachronic syntax (Roberts 2007). This will
provide part of what Arbib wants but not everything – it, too, fails to
adopt a construction-based approach and also ‘is silent on how to move
forward the study of historical phonology.’

My goal was not to write a textbook or a monograph but a book intended for
people in other disciplines about how new languages emerge, motivated in
part by a belief that linguistics allows a more sophisticated treatment of
history and change than has been obtained in biological or political
history. The book makes much of the distinction between “external
language” (language as it exists in the world) and “internal language”
(language as represented in an individual’s brain). By examining the
interplay between the two, in ways that differ from my earlier work, I
showed how children are “cue-based” learners, who scan their linguistic
environment for specified structures, making sense of the world outside in
order to build their internal language. In my view, the cue-based approach
to acquisition is a significant variant of other parametric approaches,
which solves problems in those approaches. There were new ideas about the
EXPRESSION of cues and I explored how new systems arise, how they are
acquired by children, and how adults and children play different and
complementary roles in language change.

One is generally advised not to reply to reviews. Here I merely state
briefly the intent of the book, as stated in the publisher’s blurb and in
the first few paragraphs of the preface, because nobody reading Arbib could
have any idea what the book is about. He did not understand the most
central notions.

He writes that children construct an I-language that approximates the
ambient E-language, but that is inconceivable: E-language is a different
kind of thing from I-languages. For example, I-languages have structures
but E-language is a collection of utterances.

Poverty-of-stimulus arguments are central in my work and he complains that
I do not respond to the criticisms of Pullum & Scholz (2002), not
remembering that Pullum & Scholz explicitly exclude discussion of the kind
of arguments that I have been concerned with, which they characterize
accurately as ‘not so much stimulus poverty as stimulus absence’ (pp14-16).

He says that ‘no theory is offered of how the child activates “cues” from
the observed E-language,’ ignoring discussion of the expression of cues.
He may not like that theory but a theory is discussed.

He writes: ‘His method is to simply observe that a change occurs in the
texts from date x to date y and then state without evidence that change in
children’s I-languages must have been the driving factor … And that’s the
method – gather data showing historical change, then argue that I-languages
might change as a result, and then assert without discussion that the
change in I-languages explains the E-language change.’

This is so topsy turvy that it’s hard to know where to begin. Certain
historical changes cluster and can plausibly be shown to reflect a single
change at the level of I-languages. The clustering of phenomena changing
at the same time is the evidence for the singularity of the change in
I-languages. So modal verbs in English came to be categorized as
Inflectional elements in Early Modern English; several phenomena changed,
which can be construed as a function of that single change in I-languages.
Thomas More was the last known speaker with the old system and all the
relevant phenomena occur in his extensive writings. Others had the new
system before More’s time. In general, speakers either had the old system
or the new system or, for a transitional period, both systems, but the
phenomena cluster systematically and not randomly. Given such an analysis
of I-language change, one can look for prior changes, changes in adult
usage, which changed E-language in such a way that the new system came to
be triggered, thereby EXPLAINING the change in I-languages. Hence the
interplay between adult changes and changes in acquisition by young
children, and the complementarity of adult and child changes. There was no
attempt to ‘privilege the language learning of infants over the effects of
adult innovation’ and I do not ‘insist without question that children’s
formation of new I-languages is the key to how languages change.’ The two
kinds of change, change in E-language and I-languages respectively, work
off each other – both are essential and there could be no change in
I-languages without prior change in E-language.

There is much to say about all of this, much that has been written in the
technical literature. However, I regret that Arbib was not able to find
the book he was looking for and yet more that I was not clear enough for
him to understand the central notions of the book I wrote.

REFERENCES
Pullum, G. K. & B. C. Scholz 2002 Empirical assessment of stimulus poverty
arguments. The Linguistic Review 19:9-50.
Roberts, I. G. 2007 Diachronic syntax. Oxford University Press.
Date Posted: 26-Mar-2007
Linguistic Field(s): Historical Linguistics
Sociolinguistics
Language Acquisition
LL Issue: 18.899
Posted: 26-Mar-2007

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