5 research outputs found
A Computational Cognitive Model of Syntactic Priming
The psycholinguistic literature has identified two syntactic adaptation effects in language production: rapidly decaying short-term priming and long-lasting adaptation. To explain both effects, we present an ACT-R model of syntactic priming based on a wide-coverage, lexicalized syntactic theory that explains priming as facilitation of lexical access. In this model, two well-established ACT-R mechanisms, base-level learning and spreading activation, account for long-term adaptation and short-term priming, respectively. Our model simulates incremental language production and in a series of modeling studies we show that it accounts for (a) the inverse frequency interaction; (b) the absence of a decay in long-term priming; and (c) the cumulativity of long-term adaptation. The model also explains the lexical boost effect and the fact that it only applies to short-term priming. We also present corpus data that verifies a prediction of the model, i.e., that the lexical boost affects all lexical material, rather than just heads. Keywords: syntactic priming, adaptation, cognitive architectures, ACT-R, categorial grammar, incrementality
Context Effects in Language Production: Models of Syntactic Priming in Dialogue Corpora
Institute for Communicating and Collaborative SystemsThis thesis addresses the cognitive basis of syntactic adaptation, which biases speakers
to repeat their own syntactic constructions and those of their conversational
partners. I address two types of syntactic adaptation: short-term priming and longterm
adaptation.
I develop two metrics for syntactic adaptation within a speaker and between
speakers in dialogue: one for short-term priming effects that decay quickly, and
one for long-term adaptation over the course of a dialogue. Both methods estimate
adaptation in large datasets consisting of transcribed human-human dialogue annotated
with syntactic information. Two such corpora in English are used: Switchboard,
a collection of spontaneous phone conversation, and HCRC Map Task, a set
of task-oriented dialogues in which participants describe routes on a map to one
another. I find both priming and long-term adaptation in both corpora, confirming
well-known experimental results (e.g., Bock, 1986b). I extend prior work by showing
that syntactic priming effects not only apply to selected syntactic constructions
that are alternative realizations of the same semantics, but still hold when a broad
variety of syntactic phrase structure rules are considered. Each rule represents a
cognitive decision during syntactic processing. I show that the priming effect for a
rule is inversely proportional to its frequency.
With this methodology, I test predictions of the Interactive Alignment Model
(IAM, Pickering and Garrod, 2004). The IAM claims that linguistic and situation model
agreement between interlocutors in dialogue is the result of a cascade of
resource-free, mechanistic priming effects on various linguistic levels. I examine
task-oriented dialogue in Map Task, which provides a measure of task success
through the deviance of the communicated routes on the maps. I find that long term
syntactic adaptation predicts communicative success, and it does so earlier
than lexical adaptation. The result is applied in a machine-learning based model
that estimates task success based on the dialogue, capturing 14 percent of the variance
in Map Task. Short-term syntactic priming differs qualitatively from long term
adaptation, as it does not predict task success, providing evidence against
learning as a single cognitive basis of adaptation effects.
I obtain further evidence for the correlation between semantic activity and syntactic
priming through a comparison of the Map Task and Switchboard corpora,
showing that short-term priming is stronger in task-oriented dialogue than in spontaneous conversation. This difference is evident for priming between and within
speakers, which suggests that priming is a mechanistic rather than strategic effect.
I turn to an investigation of the level at which syntactic priming influences language
production. I establish that the effect applies to structural syntactic decisions
as opposed to all surface sequences of lexical categories. To do so, I identify pairs of
part-of-speech categories which consistently cross constituent boundaries defined
by the phrase structure analyses of the sentences. I show that such distituents are
less sensitive to priming than pairs occurring within constituents. Thus, syntactic
priming is sensitive to syntactic structure.
The notion of constituent structure differs among syntactic models. Combinatory
Categorial Grammar (CCG, Steedman, 2000) formalizes flexible constituent
structure, accounting a varying degree of incrementality in syntactic sentence planning.
I examine whether priming effects can support the predictions of CCG using
the Switchboard corpus, which has been annotated with CCG syntax. I confirm the
syntactic priming effect for lexical and non-lexical CCG categories, which encode
partially satisfied subcategorization frames. I then show that both incremental and
normal-form constituent structures exhibit priming, arguing for language production
accounts that support flexible incrementality.
The empirical results are reflected in a cognitive model of syntactic realization
in language production. The model assumes that language production is subject
to the same principles and constraints as any other form of cognition and follows
the ACT-R framework (Anderson et al., 2004). Its syntactic process implements
my empirical results on priming and is based on CCG. Syntactic planning can take
place incrementally and non-incrementally. The model is able to generate simple
sentences that vary syntactically, similar to the materials used in the experimental
priming literature.
Syntactic adaptation emerges due to a preferential and sped-up memory retrieval
of syntactic categories describing linearization and subcategorization requirements.
Long-term adaptation is explained as a form of learning, while shortterm
priming is the result of a combination of learning and spreading activation
from semantic and lexical material. Simulations show that the model produces the
adaptation effects and their inverse frequency interaction, as well as cumulativity
of long-term adaptation
Significance in Language
This book offers a unique perspective on meaning in language, broadening the scope of existing understanding of meaning by introducing a comprehensive and cohesive account of meaning that draws on a wide range of linguistic approaches. The volume seeks to build up a complete picture of what meaning is, different types of meaning, and different ways of structuring the same meaning across myriad forms and varieties of language across such domains, such as everyday speech, advertising, humour, and academic writing. Supported by data from psycholinguistic and neurolinguistic research, the book combines different approaches from scholarship in semantics, including formalist, structuralist, cognitive, functionalist, and semiotics to demonstrate the ways in which meaning is expressed in words but also in word order and intonation. The book argues for a revised conceptualisation of meaning toward presenting a new perspective on semantics and its wider study in language and linguistic research. This book will appeal to scholars interested in meaning in language in such fields as linguistics, semantics, and semiotics
Significance in Language
This book offers a unique perspective on meaning in language, broadening the scope of existing understanding of meaning by introducing a comprehensive and cohesive account of meaning that draws on a wide range of linguistic approaches. The volume seeks to build up a complete picture of what meaning is, different types of meaning, and different ways of structuring the same meaning across myriad forms and varieties of language across such domains, such as everyday speech, advertising, humour, and academic writing. Supported by data from psycholinguistic and neurolinguistic research, the book combines different approaches from scholarship in semantics, including formalist, structuralist, cognitive, functionalist, and semiotics to demonstrate the ways in which meaning is expressed in words but also in word order and intonation. The book argues for a revised conceptualisation of meaning toward presenting a new perspective on semantics and its wider study in language and linguistic research. This book will appeal to scholars interested in meaning in language in such fields as linguistics, semantics, and semiotics
Théorie du bilinguisme et cognition : quelques aspects de la convergence entre la théorie classique et la recherche clinique
Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal