Mechanisms of Language Change - uni-jena.dex4diho/LangCog.Mechanisms_of_langua… · Demonstratives...
Transcript of Mechanisms of Language Change - uni-jena.dex4diho/LangCog.Mechanisms_of_langua… · Demonstratives...
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Mechanisms of Language
Change
Holger Diessel
University of Jena
http://www.holger-diessel.de/
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Language evolution
Human beings are the only
species with language.species with language.
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Language evolution
Attempts at teaching
nonhuman primates nonhuman primates
language have failed.
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Language evolution
Where does language come from?
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Language evolution
What are the genetic prerequisites for language?
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Language evolution
People with a defective FOXP2 gene are unable to produce the
FOXP2 - the language gene
People with a defective FOXP2 gene are unable to produce the
fine movements with the tongue and lips that are necessary to
speak clearly.
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Language evolution
‘A Language Gene is identified.’‘A Language Gene is identified.’
[Washington Post Oct. 2001]
The FOXP2 gene in
language development
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Language evolution
FOXP2 seems to play an important role in controlling motor
movement, but motor movement has nothing to do with
language and cognition.
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Language evolution
How did language (notably grammar) evolve?How did language (notably grammar) evolve?
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Language evolution
Many researchers agree that language evolution / development
has two important cognitive prerequisites:
� The ability to understand (linguistic) symbols
� The ability to combine symbols to larger units
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The symbolic nature of language
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What are the cognitive prerequisites for understanding symbols?
The symbolic nature of language
In order to understand/use symbols I need to understand that In order to understand/use symbols I need to understand that
other people are mental beings like I am.
[Tomasello 1999]
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Where does grammar come from?
The evolution of grammar
(1) Peter was hit by a car.
1. Where do constructions come from?
(2) The letter was written by Mary.
(3) She was kissed by someone.
2. Where do grammatical morphemes come from?
Articles: the, a, some, any
Prepositions: on, in, under, between
Auxiliaries: is, be, will
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� Content words
The evolution of grammar
Words are commonly divided into two basic types:
� Content words
� Grammatical markers
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The evolution of grammar
Content words are prototypical signs (or symbols) that combine a
sequence of speech sounds with a particular concept (or meaning).
Grammatical markers are semantically more abstract and their
occurrence seems to be dependent on the occurrence of content
words.
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The evolution of grammar
The categories of content words (i.e. nouns and verbs) are
universal.
But the categories of grammatical markers are language-specific:
There are many languages that do not have articles, auxiliaries,
relative pronouns, complementizers, modal verbs etc.
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The evolution of grammar
Content words and grammatical markers are two different types
of expressions that may have evolved differently in the evolution
of human language.
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The evolution of grammar
If human language is symbolic, as commonly assumed, one can
easily imagine a scenario in which our ancestors came up with
words for fire, tree or stone:
But how do we explain the evolution of grammatical markers?
How do we explain the evolution of bound morphemes such as the
English past tense suffix –ed or the grammatical case markers in
German: der Mann, den Mann, dem Manne, des Mannes
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The evolution of grammar
(1) Jack’s gonna come because he has won.
� is gonna > motion verb (is going to)
because > PP (by cause)� because > PP (by cause)
� he > DEM
� has > verb of possession
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Grammaticalization
Grammaticalization is the process whereby lexical items develop
into grammatical items and items that are already grammaticalized
assume new grammatical functions. assume new grammatical functions.
[Hopper and Traugott 1993]
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Grammaticalization
Auxiliaries
gonna motion verbgonna motion verb
will verb of intention
have verb of possession
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Grammaticalization
Conjunctions
while DEM hwile SUB (hwile = ‘time’)while DEM hwile SUB (hwile = ‘time’)
therefore DEM + P
given PTC
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Grammaticalization
Prepositions
during V-ingduring V-ing
in front of PP
ago prefix-gone (‘a-gone’)
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Grammaticalization
Indefinite markers
somebody NPsomebody NP
a numeral (‘one’)
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Grammaticalization
Epistemic markers
y’know ‘(do you) you know’ [question]y’know ‘(do you) you know’ [question]
(I) think main clause
guess imperative main clause
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Grammaticalization
Transparent forms
nevertheless that’s whynevertheless
however
moreover
in case
is about to
that’s why
in order to
gotta
regarding
in the course of
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The origins of grammatical function words in German
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Weil ich gerne lese, hat mir jemand ein Buch geschenkt, das jetzt
auf meinem Schreibtisch steht und das ich noch vor den Ferien
Grammaticalization
lesen werde.
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Grammaticalization
Pronouns/determiners
ein numeralein numeral
der DEM
jemand je ein Mann (=irgendeine beliebige Person)
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Grammaticalization
Conjunctions
weil Phrase include the noun ‘Weile’
nachdem P + DEM
falls Fall
dadurch DEM + P
deswegen DEM + P
vorausgesetzt PTC
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Prepositions
(1) Anhand des Beispiels
Grammaticalization
(1) Anhand des Beispiels
(2) Infolge des Angriffs auf den Irak
(3) Anlässlich seines Geburtstags
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(1) An der Hand dieses Beispiels > anhand
(2) In der Folge dieses Ereignisses > infolge
Grammaticalization
(2) In der Folge dieses Ereignisses > infolge
(3) Aus Anlass dieses Ereignisses > anlässlich
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Grammaticalization
Where do bound morphemes come from?Where do bound morphemes come from?
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Grammaticalization
Spanish Gloss
cantaré ‘I’ll sing’
cantarás
cantará
cantaremos
cantareís
cantarán
‘you’ll sing’
‘he’ll sing’
‘we’ll sing’
‘you’ll sing’
‘they’ll sing’
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Grammaticalization
Spanish Gloss Latin
cantaré ‘I’ll sing’ cantare habeo
cantarás
cantará
cantaremos
cantareís
cantarán
‘you’ll sing’
‘he’ll sing’
‘we’ll sing’
‘you’ll sing’
‘they’ll sing’
cantare habes
cantare habet
cantare habermus
cantare habetis
cantare habent
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Grammaticalization
Bound morphemes
N-ly noun meaning ‘with an x-appearance’N-ly noun meaning ‘with an x-appearance’
N-hood noun meaning ‘person/sex/quality’
N-ful hand full of x
V-ed auxiliary ‘do’ (uncertain)
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The grammaticalization of
demonstrativesdemonstratives
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Grammaticalization
All grammatical morphemes have developed out of lexical All grammatical morphemes have developed out of lexical
morphemes, principally nouns and verbsJ
[Bybee 2003]
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Cline of grammaticalization
lexicon grammar
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Grammaticalization of demonstratives
There is at least one other (important) source for grammatical
morphemes: demonstratives (or spatial deictics) such as English morphemes: demonstratives (or spatial deictics) such as English
this and that and here and there.
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Grammaticalization of demonstratives
Third person pronouns
he / it
er / sie / es
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Grammaticalization of demonstratives
Definite article
the
der/die/das
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Grammaticalization of demonstratives
Relative pronouns
that
der/die/das
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Grammaticalization of demonstratives
Complementizers
that
dass
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Grammaticalization of demonstratives
Sentence connectives/conjunctions
thus / therefore
deshalb / dadurch
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Grammaticalization of demonstratives
Directional preverbs
hin-gehen
her-kommen
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Grammaticalization of demonstratives
Copulas
NP, [DEM NP] > NP be NP
Der Mann, der ein Polizist. >
Der Mann ist ein Polizist.
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Grammaticalization of demonstratives
Common assumption: demonstratives are function words, thus they
must have developed from content words.
But there is no evidence from any language that demonstratives
developed from content words.
Thus, we may assume that demonstratives are older than other
function words.
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Grammaticalization of demonstratives
Demonstratives have a special status in language; they serve
one of the most basic functions of human communication.
In their basic use, demonstratives function to establish joint
attention.
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Joint attention
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Joint attention
Triadic situation (Bühler 1934)
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Joint attention
dyadic interactions
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Joint attention
The shift from dyadic to triadic interactions is reflected in the
emergence of joint attentional behaviours such as eye gaze and
pointing.
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Joint attention
Scaife & Bruner 1975; Butterworth 1998; Franco 2005;
Brooks & Meltzoff 2005
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Joint attention
Proto-imperatives� Proto-imperatives
� Proto-declaratives
Bates et al. (1976, 1979)
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Joint attention
Proto-imperatives are pointing gestures that resemble reaching
gestures produced with the intention to obtain an object.
Proto-declaratives are pointing gestures produced with the sole
intention to focus the addresses’ attention on a particular object.
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Joint attention
Declarative pointing is a unique trait of human communication.
Declarative pointing gestures are produced with the sole intention
to establish joint attention.
Declarative pointing (and joint attention) presupposes that the
communicative partners understand each other as mental or
intentional agents and are able to engage in triadic interactions.
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Joint attention
Demonstratives have a special status in language because they
are the quintessential linguistic device to establish joint attention. are the quintessential linguistic device to establish joint attention.
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Demonstratives
� Demonstratives are universal.
� Demonstratives emerge very early in language acquisition.
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Demonstratives
Eve Naomi Nina Peter Total %mean
1. that
2. it
3. a
4. there
860
481
581
299
327
488
97
175
241
142
234
52
366
303
349
500
1794
1414
1261
1026
3.1
2.5
2.3
2.14. there
5. the
6. my
7. what
8. no
9. mommy
…
13. this
…
15. here
299
340
348
146
353
283
…
41
…
67
175
145
61
511
138
187
…
406
…
31
52
341
314
10
117
148
…
52
…
247
500
74
161
162
115
29
…
97
…
96
1026
900
884
829
723
647
…
596
…
441
2.1
1.9
1.8
1.5
1.2
1.2
…
1.2
…
1.1
Total 20.512 13.072 8.551 12.255 54.390 100
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Demonstratives
� Demonstratives are universal.
� Demonstratives emerge very early in language acquisition.
� Demonstratives are very old.� Demonstratives are very old.
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Demonstratives
German der hier der da
French celui-ci celui-là
Swedish denhär dendär
Reinforcement:
Latin ille
Vulgar Latin ecce ille
Old French cest cel
French ce
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Demonstratives
Demonstratives emerged very early in the evolution of language
so that we simply do not know how they evolved.
Demonstratives are part of the basic vocabulary of every Demonstratives are part of the basic vocabulary of every
language.
Demonstratives provide a common historical source for some of
the most frequent grammatical markers.
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Demonstratives
The grammaticalization of demonstratives originates from the
anaphoric and discourse-deictic uses.
(1) The Yukon lay a mile wide and hidden under three feet of ice. (1) The Yukon lay a mile wide and hidden under three feet of ice.
On top of this ice were as many feet of snow.
(2) Oh, pretty big. Big enough so that the rock doesn't look nearly
as tall as it is. The top's bigger than the base. The bluff is sort of
worn away for several hundred feet up. That's one reason it's
so hard to climb.
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Demonstratives
Anaphoric and discourse-deictic demonstratives involve the same
psychological mechanisms as demonstratives that speakers use with
text-external reference. In both uses, demonstratives focus the
interlocutors’ attention on a particular referent.
Joint attention is thus not only important to coordinate the interlocutors’
attentional focus in the speech situation, it also plays an important role
in the internal organization of discourse.
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Demonstratives
When anaphoric and discourse deictic demonstratives are
routinely used to express a particular relationship between two routinely used to express a particular relationship between two
linguistic units, they often loose their deictic force and develop into
grammatical markers.
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Demonstratives
(1) Listen to this: Jack told me that he won’t come.
Demonstratives > complementizer
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Demonstratives
(1) Middle High German
johgizalta in sâr thaʒ,
Demonstratives > complementizer
johgizalta in sâr thaʒ,
and told them immediately that
thiu sâlida untar in uuas
theluck among them was
‘And he told them immediately that good fortune was among them.’
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Demonstratives
(1) Old English
þt gefremede Diulius hiora consul
Demonstratives > complementizer
þt gefremede Diulius hiora consul
that arranged Diulius their consul
þt þt angin wearð tidlice Durthogen
COMP that beginning was in.time achieved
‘Their consul Diulius arranged (it) that it was started on time.’
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Demonstratives
Grammatical markers that commonly develop from demonstratives:
� Complementizers
� Relative pronouns
� Third person pronouns� Third person pronouns
� Definite articles
� Conjunctions
� Directional preverbs
� Copulas
� Focus markers
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Demonstratives
Content words Demonstratives
Grammatical
markers
Grammatical
markers
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Mechanisms of Language
Change
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Questions:
� Where do grammatical morphemes come from?
� Where do grammatical constructions come from?
Review
� Content words
� Demonstratives
Sources of grammatical markers:
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Where do grammatical constructions come from?
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The development of constructions
VP
S S
Peter saw that: Mary kissed John.
NP
NP V PRO NP V NP
VP
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The development of constructions
SSUB
VP
S
Peter saw that Mary kissed John.
SSUB
NP V COMP NP V NP
S
VP
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The development of constructions
S
S
I am going to marry Bill.
VPNP
S
PRO AUX V INF V NP
SSUB
VP
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The development of constructions
S
VP
I am.going.to marry Bill.
AUXNP
PRO V N
NP
VP
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The development of constructions
Free discourse configurations -> phrase structureFree discourse configurations -> phrase structure
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Grammaticalization
going to > gonna
Phonetic reduction
going to > gonna
I will > I’ll
I am > I’m
do not > don’t
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Grammaticalization
that /those > that [complementizer]
Loss of inflectional properties
that /those > that [complementizer]
go-ing > gonna
give > given
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Grammaticalization
want to > wanna
Loss of constituent structure
want to > wanna
[in [front [of__]]] > [in front of [ __ ]]
some DET body N > [somebody] PRO
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Grammaticalization
have (poss) > have (aux)
Semantic bleaching
have (poss) > have (aux)
go (motion) > gonna (aux)
stomach (concrete) > in (relational)
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Grammaticalization
Grammaticalization is unidirectional.Grammaticalization is unidirectional.
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Grammaticalization
ups and downs
if and buts
I dislike her use of ismsI dislike her use of isms
a downer
siezen/duzen
das Für und Wider
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Grammaticalization
� It provides a straightforward answer to the question ‘Where does
grammar come from?’
� It challenges the assumption that linguistic categories have rigid
category boundaries: Is in front of a PP or a preposition? Indirect category boundaries: Is in front of a PP or a preposition? Indirect
support for a prototype approach to linguistic categorization.
� It challenges the static view of grammar: Linguistic structures and
linguistic categories are constantly changing. What we need is a
dynamic theory of grammar.
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Grammaticalization
Grammaticalization involves general cognitive or psychological
process.
Grammaticalization often involves a mapping between two
cognitive domains.
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From space to time
(1) a. The priest stood before the altar.
b. St. Michael’s day is before Christmas.
(2) a. Bill is in Leipzig.
b. He will come in the spring.b. He will come in the spring.
(3) a. The balloon flew over the hill.
b. The game is over.
(4) a. He followed him.
b. World War II was followed by a 45 year
period of Cold War.
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From space to time
(5) a. That’s a pretty long log.
b. It has been a pretty long day.
(6) a. They were driving along the river.
b. He new it all along.
(7) a. He is going to the village.
b. The rain is going to help the farmer.
(8) a. At the end of the queue.
b. At the end of the day.
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From space to time
Past Present Future
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is going to
From space to time
Boroditsky 2000Christmas is coming up soon.
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is going to
From space to time
Boroditsky 2000
komma att
Christmas is coming up soon.
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From space to time
(1) The revolution is before us.
(2) The revolution is over before breakfast.
(ego-moving)
(time-moving)(2) The revolution is over before breakfast. (time-moving)
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From space to time
(1) a. I have been waiting for you since the train left this morning.
b. Since I have an exam tomorrow, I won’t be able to go out tonight.
(2) a. Wenn wir angekommen sind, rufen wir dich an.
b. Wenn er dort angekommen ist, hätte er angerufen.b. Wenn er dort angekommen ist, hätte er angerufen.
(3) a. all die Weile > weil
b. while
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On the role of frequency in diachronic changeOn the role of frequency in diachronic change
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Frequency and change
Give 12
Keep 3
Bring 47 types
Bring 4
See 12
Think 7
Know 5
Eat 2
7 types
47 tokens
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Frequency and change
summary [sʌməri]
mammary [mʌməri]
summary, memory, family, salary, artillary, cursory
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18,2
60,2
family
every
Summe von Häufigkeit
Frequency and change
Bybee (2001)
0
0,5
1,3
2,6
6,2
11,1
0 10 20 30 40 50 60 70
mammary
cursory
artillery
summary
salary
memory
Verwendungshäufigkeiten
Wort
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Zipf’s law
Frequently used expressions tend to undergo phonetic reduction.
Since frequently used expressions are more easily predictable, they Since frequently used expressions are more easily predictable, they
are more easily identifiable even if they are phonetically reduced.
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Pollack & Pickett (1964)
Only about 50% of all words produced in continuous speech are
phonetically recognizable in isolation.
Especially difficult to identify in isolation are grammatical markers and
frequent content words. frequent content words.
Frequent words tend to be phonetically reduced because in a given
context they are easily predictable (e.g. you know that nouns are often
preceded by an article, which therefore is easily identified even if it is
phonetically reduced).
Frequently used expressions may be shorter because speakers
have more practice producing them.
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Krug (1998)
The reduction effect can also be observed in sequences of linguistic
expressions.
that is vs. that’sthat is vs. that’s
we will vs. we’ll
I have vs. I’ve
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Krug (1998)
70%
80%
90%
0%
10%
20%
30%
40%
50%
60%
here how where there who they we you I
Co
ntr
ac
tio
n r
ati
o
BEC
LLC
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Bybee & Scheibman (1999)
� Tokens with an initial [d] and a full vowel [dõt, dõn]
� Tokens with an initial flap and a full vowel [ɾõt, ɾõ]
� Tokens with a flap and a reduced vowel [ɾ ͂ə]� Tokens with a flap and a reduced vowel [ɾ ͂ə]
� Tokens with just a reduced vowel [ɾ ͂ə, ə]
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Bybee & Scheibman (1999)
[dõt, dõ] [ɾõt, ɾõ] [ɾə͂] [ɾə͂, ə] Total
I 16 22 38 12 88
You 7 7 14You 7 7 14
We 2 6 8
They 1 3 4
NP 5 5
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Bybee & Scheibman (1999)
[dõt, dõ] [ɾõt, ɾõ] [ɾə͂] [ɾə͂, ə] Total
know
think
2
7
8
6
24
6
5
1
39
20think
have
have to
want to
see
like
7
1
1
1
3
6
7
2
1
1
2
6
1
1
3
1
1
20
9
4
5
4
2
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Bybee & Scheibman (1999)
High frequency strings such as I don’t know and I don’t think have
turned into processing units.
Processing units originate as variants of full forms, but may become
conventionalized.conventionalized.
The conventionalization of small biases in language production leads
to diachronic change.
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The development of irregular verbs
Old Form New Form
climb clomb climbed
Frequency can also be a conservative force.
climb
creep
laugh
yield
step
clomb
crope
low
yold
stope
climbed
crept
laughed
yielded
stepped
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The development of do-support
Questions
(1) Know you where Peter is?
(2) Do you know where Peter is?(2) Do you know where Peter is?
Negation
(1) Peter know not that we are here.
(2) Peter does not know that we are here.
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Krug (1998)
65%
40%
50%
60%
70%P
erce
nta
ge
Early Modern English
They know not what they do.
18% 17%
0%
10%
20%
30%
auxiliaries and
modals
main verbs others
Items preceding not
Per
cen
ta
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Two frequency effects
� Reduction effect: Development of new forms
� Preserving effect: Protection of high frequency items from
analogical leveling
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Two types of markedness
The two frequency effects have given rise to some striking cross-
linguistic tendencies, which typologists characterize with the notion of
markedness:
� Structural markedness
� Behavioral markedness
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Structural markedness
Singular Plural
English tree-Ø tree-s
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Structural markedness
Singular Plural
English tree-Ø tree-s
Chinese tree-Ø tree-Ø
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Structural markedness
Singular Plural
English tree-Ø tree-s
Chinese tree-Ø tree-Ø
Latvian tree-x tree-y
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Structural markedness
Singular Plural
English tree-Ø tree-s
Chinese tree-Ø tree-Ø
Latvian tree-x tree-y
tree-x tree- Ø
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Structural markedness
If singular nouns occur with an overt number marker, plural
nouns also take a number marker. nouns also take a number marker.
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Structural markedness
Turkish Singular Plural
Nominative
Accusative
adam
adam-ɩ
adam-lar
adam-lar-ɩAccusative
Genitive
Dative
Locative
Ablative
adam-ɩ
adam-ɩn
adam-a
adam-da
adam-dan
adam-lar-ɩ
adam-lar-ɩn
adam-lar-a
adam-lar-da
adam-lar-dan
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Structural markedness
If a language uses a case marker for the object it also uses a
case marker for the subject.
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Structural markedness
� Frequently used categories are structurally unmarked because
their endings have been reduced.
How do we account for the asymmetries?
their endings have been reduced.
� Frequently used categories are structurally unmarked because
they function as the default, and marking the default would be
redundant.
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Local markedness
Turkana
ŋa-muk1 ‘shoes’
a-muk-àt ‘shoe’
English
fish, deer, sheep
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Behavioral markedness
Present
1st SG am
2nd SG are2 SG are
3rd SG is
1st PL are
2nd PL are
3rd PL are
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Behavioral markedness
Present Past
1st SG am was
2nd SG are were2 SG are were
3rd SG is was
1st PL are were
2nd PL are were
3rd PL are were
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Behavioral markedness
The preserving effect of frequency accounts for behavioral
markedness: Frequent (irregular) forms can be memorized more
How do we account for the asymmetry?
markedness: Frequent (irregular) forms can be memorized more
easily than infrequent ones (and thus infrequent forms are more
easily regularized).
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� Since the singular is more frequent than the plural, singular
verb forms tend to have more irregularities than plural verb
forms.
Behavioral markedness
forms.
� Since the present tense is more frequent than the past tense,
present tense forms tend to have more irregularities than past
tense forms.
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Conclusion
Frequency is an important determinant of language change.
Linguistic knowledge is determined by our experience with language.
Grammar is shaped by language use.
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Conclusion
Grammar is a fluid system that is constantly changing by virtue
of the psychological mechanisms involved in language use. of the psychological mechanisms involved in language use.
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Conclusion
In the past, linguistic research was concerned with invariable
categories and eternal rules.
In the future, linguistics should focus on cognitive and
psychological mechanisms driving the emergence of linguistic psychological mechanisms driving the emergence of linguistic
structure.
What we need is a dynamic theory of grammar, in which linguistics
categories and constructions are seen as emergent phenomena that
we will only understand if we take into account how they evolved, both
in history and in language acquisition.
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This is the end.