Cognitive modeling of individual variation in reference production and comprehension

A challenge for most theoretical and computational accounts of linguistic reference is the observation that language users vary considerably in their referential choices. Part of the variation observed among and within language users and across tasks may be explained from variation in the cognitive resources available to speakers and listeners. This paper presents a computational model of reference production and comprehension developed within the cognitive architecture ACT-R. Through simulations with this ACT-R model, it is investigated how cognitive constraints interact with linguistic constraints and features of the linguistic discourse in speakers’ production and listeners’ comprehension of referring expressions in specific tasks, and how this interaction may give rise to variation in referential choice. The ACT-R model of reference explains and predicts variation among language users in their referential choices as a result of individual and task-related differences in processing speed and working memory capacity. Because of limitations in their cognitive capacities, speakers sometimes underspecify or overspecify their referring expressions, and listeners sometimes choose incorrect referents or are overly liberal in their interpretation of referring expressions

Production before comprehension in the emergence of transitive constructions in Dutch child language

Although 2-year-old English- or Dutch-speaking children tend to use correct subject-object word order in their own utterances, they appear to make a substantial number of word order errors in their comprehension of other people’s utterances. This pattern of adult-like production but poor comprehension is challenging for linguistic theory. While most approaches to language acquisition explain this pattern from extra-linguistic factors such as task demands, the constraint-based approach Optimality Theory predicts this asymmetry between production and comprehension to arise as a result of the linguistic competition between constraints on word order and animacy. This study tests this prediction by investigating how children’s comprehension and production of word order in transitive constructions develop, and to what degree their comprehension and production are influenced by animacy. Two- and three-year-old Dutch speaking children (n = 32) and adult controls (n = 41) were tested on their comprehension and production of simple transitive sentences, in which the animacy of the grammatical subject and object were manipulated. Comprehension was tested in a picture selection task and a preferential looking task, and production was tested in a parallel sentence elicitation task. Children’s comprehension of transitive sentences in the picture selection task was found to be less accurate than their production of the same sentences in the sentence elicitation task. Their eye gaze in the minimally demanding preferential looking task did not reveal a more advanced understanding of these sentences. In comprehension, children’s response accuracy, and to a lesser extent their eye gaze, was influenced by the animacy of subject and object, providing evidence that their poor comprehension is due to the competition between word order and animacy, as predicted by the constraint-based approach. In contrast, animacy may have a facilitating effect on children’s production of transitive sentences. These findings suggest that the mature form and meaning of a transitive construction are not acquired together. Rather, the form-meaning pairings of transitive constructions seem to arise gradually as the by-product of acquiring the constraint ranking of the grammar. This leads to the gradual alignment of forms and meanings in child language and hence to the emergence of linguistic constructions

Pronoun Processing and Interpretation by L2 Learners of Italian: Perspectives from Cognitive Modelling

How do second language learners acquire form-meaning associations in the second language that are inconsistent with their first language? In this study, we focus on subject pronouns in Italian and Dutch. A native speaker of the non-null subject language Dutch learning the null subject language Italian as a second language will not only have to learn to use and comprehend null pronouns, but will also have to learn to use and comprehend overt pronouns differently in the L2 than in the L1. The interpretation of Italian overt pronouns, but not of Dutch overt pronouns or Italian null pronouns, has been argued to require perspective taking, specifically the use of hypotheses about the conversational partner’s communicative choices to guide one’s own choices. Therefore, a related question is how perspective taking and cognitive constraints influence L2 acquisition of such forms. Using computational cognitive modelling, this study explores two learning scenarios. In cognitive model 1, second language acquisition proceeds in the same way as first language acquisition and is based on the same grammar. In cognitive model 2, second language acquisition differs from first language acquisition and involves the construction of a partly different grammar. Our results suggest that the second scenario may be cognitively more plausible than the first one. Furthermore, our models explain why second language learners of Italian perform less native-like on overt pronouns than on null pronouns

German children's processing of morphosyntactic cues in wh-questions

Two experiments investigated the effects of case and verb agreement cues on the comprehension and production of which-questions in typically developing German children (aged 7–10) and adults. Our aims were to determine (a) whether they make use of morphosyntactic cues (case marking and verb agreement) for the comprehension of which-questions, (b) how these questions are processed, and (c) whether the presence and position of morphosyntactic cues available for the listener influence the speaker’s production of which-questions. Performance on a picture selection task with eye tracking shows that children with low working memory make less use of morphosyntactic cues than children with high working memory and adults when interpreting object questions. Gaze data of both groups reveal garden-path effects and revisions for object and passive questions, which can be explained by a constraint-based account. Furthermore, children’s difficulties with object questions are related to the type of disambiguation cue. In a question elicitation task with patient-initial items, children overall prefer production of passives, whereas adults’ productions depend on the availability of disambiguation cues for the listener

Does reported speech influence listeners' choice of perspective in the interpretation of spatial prepositions?

Linguistic cues can encourage adults to adopt an other-centric rather than an egocentric perspective. This study investigated whether the presence of direct speech compared to indirect speech influences listeners’ choice of perspective when interpreting the Dutch spatial prepositions voor ‘in front of ’ and achter ‘behind’. Dutch adults and 10 to 12-year-old children were tested in a sentence-picture verification task. Contrary to expectations, we found no difference between direct and indirect speech (Study 1), nor did we find a difference between reported and non-reported speech (Study 2). Most adult listeners adopted the contrasting perspective of the speaker, irrespective of how the information about the reported speech was expressed. We did find a difference between adults and children: children adopted the other person’s perspective less often than adults did. Overall, the results suggest that the mere presence of a reported speaker already is a cue for taking this speaker’s perspective