The effect of additional characters on choice of referring expression: Everyone counts

Paths to Common Ground in ASD

Common ground (CG), the shared contextual knowledge serving everyday situations like conversations, is crucial for effective communication. This study delved into CG generation between peers with autism spectrum disorder (ASD, N = 84) compared to Controls (N = 56) children and adolescents (ages 6-16 years) paired into peer dyads. We aimed to deepen the understanding of the mechanism involved in CG efficacy among peers by exploring the roles of Theory of Mind (ToM) and Vocabulary in CG formation during play. Participants engaged in a structured task probing CG production in an ambiguous setting. Findings show that ASD and Control dyads generate CG spontaneously, yet the Control group demonstrated greater efficiency by achieving common conceptualization faster and with fewer words. Age and CG measures were correlated, outlining CG development, and Path analysis models suggested independent contributions from Vocabulary and ToM to CG efficiency. Limitations include the task's structured nature, precluding a comprehensive assessment of language and visual perception abilities. Taken together, the findings highlight the potential for interventions targeting CG acquisition in ASD, which is crucial for daily life participation. Interventions could harness cognitive processes like vocabulary and ToM to enhance dialogue efficacy among children with ASD.

Hearing Pronouns Primes Speakers to Use Pronouns

Speaking requires frequent decisions about how to refer, for example whether to use a pronoun (she) or a name (Ana). It is well known that this choice is guided by the discourse context, but little is known about the representations that are activated. We use priming to test whether this choice can be facilitated through recent exposure, and if so, what representations are activated. In a storytelling task, participants take turns with experimenters telling a story that is illustrated in 2-panel cartoons. The first sentence is given, and participants describe the second panel in their own words. We manipulate whether the experimenter used a pronoun or name in the prior story. Experiment 1 provides the first evidence in the literature that reference form choice can be primed, and that it is not dependent on the syntactic position of the antecedent. However, the effect is not finely tuned to the preceding prime. Instead, exposure at the start of the experiment persists throughout, even when the prime changes. Experiments 2 and 3 further show that exposure to pronoun primes result in greater pronoun use than at baseline, but that there is no sensitivity to the prime on the most recent trial. Results argue against a role for production facilitation in pronoun use, which suggests that reference production is not impacted by production efficiency.

Information entropy facilitates (not impedes) lexical processing during language comprehension

It is well known that contextual predictability facilitates word identification, but it is less clear whether the uncertainty associated with the current context (i.e., its lexical entropy) influences sentence processing. On the one hand, high entropy contexts may lead to interference due to greater number of lexical competitors. On the other hand, predicting multiple lexical competitors may facilitate processing through the preactivation of shared semantic features. In this study, we examined whether entropy measured at the trial level (i.e., for each participant, for each item) corresponds to facilitatory or inhibitory effects. Trial-level entropy captures each individual's knowledge about specific contexts and is therefore a more valid and sensitive measure of entropy (relative to the commonly employed item-level entropy). Participants (N = 112) completed two experimental sessions (with counterbalanced orders) that were separated by a 3- to 14-day interval. In one session, they produced up to 10 completions for sentence fragments (N = 647). In another session, they read the same sentences including a target word (whose entropy value was calculated based on the produced completions) while reading times were measured. We observed a facilitatory (not inhibitory) effect of trial-level entropy on lexical processing over and above item-level measures of lexical predictability (including cloze probability, surprisal, and semantic constraint). Extra analyses revealed that greater semantic overlap between the target and the produced responses facilitated target processing. Thus, the results lend support to theories of lexical prediction maintaining that prediction involves broad activation of semantic features rather than activation of full lexical forms.

The Importance of Linguistic Factors: He Likes Subject Referents

We report the results of one visual-world eye-tracking experiment and two referent selection tasks in which we investigated the effects of information structure in the form of prosody and word order manipulation on the processing of subject pronouns er and der in German. Factors such as subjecthood, focus, and topicality, as well as order of mention have been linked to an increased probability of certain referents being selected as the pronoun's antecedent and described as increasing this referent's prominence, salience, or accessibility. The goal of this study was to find out whether pronoun processing is primarily guided by linguistic factors (e.g., grammatical role) or nonlinguistic factors (e.g., first-mention), and whether pronoun interpretation can be described in terms of referents' "prominence" / "accessibility" / "salience." The results showed an overall subject preference for er, whereas der was affected by the object role and focus marking. While focus increases the attentional load and enhances memory representation for the focused referent making the focused referent more available, ultimately it did not affect the final interpretation of er, suggesting that "prominence" or the related concepts do not explain referent selection preferences. Overall, the results suggest a primacy of linguistic factors in determining pronoun resolution.

The contribution of discursive and cognitive factors in referential choices made by elderly people during a narrative task

The present study focuses on referential choices made by healthy aged adults during narrative discourse, and their relationship with cognitive and socio-cognitive abilities. Previously, some studies have shown that, compared to young adults, older adults produce more pronouns when referring to various entities during discourse, regardless of the accessibility level of the referent for the addressee. This referential behavior has been interpreted in relation to the decrease of cognitive abilities, such as working memory abilities. There is, as of yet, little empirical evidence highlighting which cognitive competences preferentially support referential choices during discourse production. Here, we focus on three categories of referential markers (indefinite, definite markers and pronouns) produced by 78 participants from 60 to 91 years old. We used a storytelling task enabling us to examine the referential choices made at three discourse stages (introduction, maintaining or shift of the referent in focus) and in increasing levels of referential complexity (one vs two characters, and different vs same gender). In addition to specifically assessing how increasing age influences referential choices, we also examine the contribution of various cognitive and socio-cognitive skills that are presumed to play a specific role in referential choices. We found that both age and specific cognitive abilities (planification, inhibition, and verbal episodic memory) had an effect on referential choices, but that these effects depended on when (at which discourse stage) the referential markers were produced. Overall, our study highlights the complex interplay between discursive and cognitive factors in referential choices made by healthy older speakers.

The Production of Subject Anaphoric Expressions in Italian and Mexican Spanish: A Forced-Choice Experimental Study

We compare the production of anaphoric expressions in Spanish and Italian. In two sentence completion tasks, Spanish and Italian-speaking participants complete sentence fragments where we manipulate the location of the antecedents (in a main or subordinate clause), the gender of the antecedents (similar or different) and the referent of the anaphoric expression (subject or object antecedent). Our results show a weaker subject bias for null pronouns and a weaker object bias for overt pronouns in Spanish compared to Italian. In addition, a thetic interpretation of the initial (subordinate) clause decreases the accessibility of the subject antecedent, leading to an increased use of noun phrases when there is gender-similarity between antecedents. By including gender dissimilar antecedents, we further observe an increase in speakers' production of overt pronouns when reference to an object antecedent is expected.

The effects of semantic similarity on Mandarin speakers' referential expressions

Previous research has found apparently contradictory effects of a semantically similar competitor on how people refer to previously mentioned entities. To address this issue, we conducted two picture-description experiments in spoken Mandarin. In Experiment 1, participants saw pictures and heard sentences referring to both the target referent and a competitor, and then described actions involving only the target referent. They produced fewer omissions and more repeated noun phrases when the competitor was semantically similar to the target referent than otherwise. In Experiment 2, participants saw introductory pictures and heard sentences referring to only the target referent, and then described actions involving both the target referent and a competitor. They produced more omissions and fewer pronouns when the competitor was semantically similar to the target referent than otherwise. We interpret the results in terms of the representation of discourse entities and the stages of language production.

The production of referring expressions is influenced by the likelihood of next mention

The present study provides converging evidence across three next-mention biases that likelihood of coreference influences the choice of referring expression: implicit causality (IC), the goal bias of transfer-of-possession (ToP) verbs, and implicit consequentiality (I-Cons). A pilot study and four experiments investigated coreference production in German using a forced-reference paradigm. The pilot study used object- and subject-biased IC verbs, showing a statistically marginal influence of next-mention bias on referential expressions, albeit mediated by grammatical function and feature overlap between antecedents. Experiment 1 focused on these features for object reference with ToP verbs, showing effects of coreference bias. In a within-participants comparison, Experiment 2 showed comparable effects for two classes of IC verbs, stimulus-experiencer and experiencer-stimulus predicates. Experiment 3 replicated and extended the IC form effects to another verb class, agent-evocator verbs. Finally, Experiment 4 revealed effects on anaphoric form also for I-Cons, while simultaneously replicating the effect observed for IC.

A systematic evaluation of factors affecting referring expression choice in passage completion tasks

There is a long-standing controversy around the question of whether referent predictability affects pronominalization: while there are good theoretical reasons for this prediction (e.g., Arnold, 2008), the experimental evidence has been rather mixed. We here report on three highly powered studies that manipulate a range of factors that have differed between previous studies, in order to determine more exactly under which conditions a predictability effect on pronominalization can be found. We use a constrained as well as a free reference task, and manipulate verb type, antecedent ambiguity, length of NP and whether the stimuli are presented within a story context or not. Our results find the story context to be the single important factor that allows to elicit an effect of predictability on pronoun choice, in line with (Rosa and Arnold, 2017; Weatherford and Arnold, 2021). We also propose a parametrization for a rational speech act model, that reconciles the findings between many of the experiments in the literature.

A chimpanzee by any other name: The contributions of utterance context and information density on word choice

An important feature of language production is the flexibility of lexical selection; producers could refer to an animal as chimpanzee, chimp, ape, she, and so on. Thus, a key question for psycholinguistic research is how and why producers make the lexical selections that they do. Information theoretic approaches have argued that producers regulate the uncertainty of the utterance for comprehenders, for example using longer words like chimpanzee if their messages are likely to be misunderstood, and shorter ones like chimp when the message is easy to understand. In this work, we test for the relative contributions of the information theoretic approach and an approach more aligned with psycholinguistic models of language production. We examine the effect on lexical selection of whole utterance-level factors that we take as a proxy for register or style in message-driven production accounts. Using a modern machine learning-oriented approach, we show that for both naturalistic stimuli and real-world corpora, producers prefer words to be longer in systematically different contexts, independent of the specific message they are trying to convey. We do not find evidence for regulation of uncertainty, as in information theoretic approaches. We offer suggestions for modification of the standard psycholinguistic production approach that emphasizes the need for the field to specify how message formulation influences lexical choice in multiword utterances.

The Radical Unacceptability Hypothesis: Accounting for Unacceptability without Universal Constraints

The Radical Unacceptability Hypothesis (RUH) has been proposed as a way of explaining the unacceptability of extraction from islands and frozen structures. This hypothesis explicitly assumes a distinction between unacceptability due to violations of local well-formedness conditions—conditions on constituency, constituent order, and morphological form—and unacceptability due to extra-grammatical factors. We explore the RUH with respect to classical islands, and extend it to a broader range of phenomena, including freezing, A′ chain interactions, zero-relative clauses, topic islands, weak crossover, extraction from subjects and parasitic gaps, and sensitivity to information structure. The picture that emerges is consistent with the RUH, and suggests more generally that the unacceptability of extraction from otherwise well-formed configurations reflects non-syntactic factors, not principles of grammar.

Greater entropy leads to more explicit referential forms during language production

Speakers can refer to previously-mentioned words (e.g., the actor) using attenuated referring expressions such as pronouns (he), or elaborated referential forms such as repeating the original word (the actor). Predictability is theorized to influence form of reference during language production: More attenuated forms may be used to refer to more predictable words, presumably because predictable words are already active in memory, and therefore require less linguistic signal during subsequent reference. However, the reported results are mixed. The current study examines the effect of entropy, an information-theoretic metric that captures the predictability of all, not just one, referential candidate, on the production of referential forms. A meta-analysis combining data from multiple experiments (492 participants, 405 items) revealed that greater entropy leads to more explicit referential forms, suggesting that entropy might intensify the competition between referential candidates during language production, reducing total memory activation.

The Effects of Semantic Role Predictability on the Production of Overt Pronouns in Spanish

In order to refer in any language, speakers must choose between explicit forms of expression, such as names or descriptions, or more ambiguous forms like pronouns. Current models suggest that reference form is driven by subjecthood, where speakers in English choose pronouns for the subject, and speakers of null pronoun languages like Spanish or Italian use null pronouns. We test this generalization by examining the effect of a different factor, thematic role predictability, on reference production in Spanish. In stories about transfer events (e.g., Ana gave a ball to Liz), speakers prefer to use pronouns more for reference to goals (Liz) than sources (Rosa and Arnold, Journal of Memory and Language 94:43-60, 2017). However, this has not been examined for null pronoun languages. In two experiments, we demonstrate that Spanish speakers are also sensitive to thematic role, but it primarily affects the rate of overt pronouns (ella, el) rather than null pronouns. These results highlight the need to include semantic constraints in models of reference production for null-pronoun languages.

Animacy-induced conflict in sentence production and comprehension from late childhood to adolescence

Some animacy configurations elicit parallel semantic interference in adult production and comprehension; for example, phrases with similar animate nouns like the man that the girl is hugging are more difficult than phrases like the doll that the girl is hugging. Yet little is known about how this interference manifests in development, particularly, beyond early childhood. Because frontal brain maturation and cognitive control improvements are known to occur across late childhood and adolescence, we investigated (a) how animacy-induced difficulty in production and comprehension vary with age throughout this period and (b) whether control processes reflected in the backward digit span (BDS) test uniquely explained these differences besides other language measures. In separate tasks, participants (8- to 15-year-old children; N = 91) heard auditory descriptions of depicted characters, produced characters' descriptions, and completed BDS, vocabulary, and reading experience tests. Results indicated that, as in adults, animacy modulated performance in production and comprehension across all ages. The animacy modulation interacted with age in production but not in comprehension, suggesting age-related animacy differences in production but relatively stable differences in comprehension despite processing speed improvements. Importantly, these age-related production differences were also modulated by the BDS scores; only participants with higher BDS scores displayed age-related animacy differences. Together, these results indicate that comprehension and production develop at different rates and that the development of BDS performance interacts with age-dependent changes in sentence planning from late childhood to adolescence. More generally, the study highlights tasks' disparities to be explained by cognitive and developmental models of language.

Encoding Motion Events During Language Production: Effects of Audience Design and Conceptual Salience

We investigate the extent to which pragmatic versus conceptual factors can affect a speaker's decision to mention or omit different components of an event. In the two experiments, we demonstrate the special role of pragmatic factors related to audience design in speakers' decisions to mention conceptually "peripheral" event components, such as sources (i.e., starting points) in source-goal motion events (e.g., a baby crawling from a crib to a toybox). In particular, we found that pragmatic factors related to audience design could not only drive the decision to omit sources from mention, but could also motivate speakers to mention sources more often than needed. By contrast, speaker's decisions to talk about goals did not appear to be fundamentally driven by pragmatic factors in communication. We also manipulated the animacy of the figure in motion and found that participants in our studies treated both animate and inanimate source-goal motion events in the same way, both linguistically and in memory. We discuss the implications of our work for message generation across different communicative contexts and for future work on the topic of audience design.

Switch-reference and its role in referential choice in Mbyá Guaraní narratives

Switch-reference has been analyzed as a reference tracking mechanism, whose main function is to avoid ambiguity of reference. One domain where this function has been argued to manifest itself is referential choice. Kibrik (Kibrik, Andrej. 2011. Reference in discourse. Oxford: Oxford University Press) notably proposed that switch-reference marking plays the role of a referential aid, which helps to prevent referential conflict, thereby enabling the production of reduced referential expressions such as pronouns and zeros. The present study probes this theory through an analysis of the role of switch-reference marking in multifactorial models of referential choice in Mbyá Guaraní. We show that while switch-reference increases the likelihood of mention reduction in Mbyá Guaraní, this effect is marginal relative to other predictors of referential choice. We argue that this result is compatible with the analysis of switch-reference as a referential aid, but also supports analyses that emphasize the multiplicity of its functions, beyond the disambiguation of reference.

Representations underlying pronoun choice in Italian and English

Research has shown that speakers use fewer pronouns when the referential candidates are more similar and hence compete more strongly. Here we examined the locus of such an effect, investigating (1) whether pronoun use is affected by the referents’ competition at a non-linguistic level only (non-linguistic competition account) or whether it is also affected by competition arising from the antecedents’ similarities (linguistic competition account) and (2) the extent to which this depends on the type of pronoun. Speakers used Italian null pronouns and English pronouns less often (relative to full nouns) when the referential candidates compete more strongly situationally, while the antecedents’ semantic, grammatical or phonological similarity did not affect the rates of either pronouns, providing support for the non-linguistic competition account. However, unlike English pronouns, Italian null pronouns were unaffected by gender congruence between human referents, running counter to the gender effect for the use of non-gendered overt pronouns reported earlier. Hence, while both null and overt pronouns are sensitive to non-linguistic competition, what similarity affects non-linguistic competition partly depends on the type of pronouns.

Avoiding gender ambiguous pronouns in French

Across many languages, pronouns are the most frequently produced referring expressions. We examined whether and how speakers avoid referential ambiguity that arises when the gender of a pronoun is compatible with more than one entity in the context in French. Experiment 1 showed that speakers use fewer pronouns when human referents have the same gender than when they had different genders, but grammatical gender congruence between inanimate referents did not result in fewer pronouns. Experiment 2 showed that semantic similarity between non-human referents can enhance the likelihood that speakers avoid grammatical-gender ambiguous pronouns. Experiment 3 pitched grammatical gender ambiguity avoidance against the referents' competition in the non-linguistic context, showing that when speakers can base their pronoun choice on non-linguistic competition, they ignore the pronoun's grammatical gender ambiguity even when the referents are semantically related. The results thus indicated that speakers preferentially produce referring expressions based on non-linguistic information; they are more likely to be affected by the referents' non-linguistic similarity than by the linguistic ambiguity of a pronoun.

EXPRESS: Comparing individual and collective management of referential choices in dialogue

Past research shows that when a discourse referent is mentioned repeatedly, it is usually introduced with a full NP and maintained with a reduced form such as a pronoun. Is this also the case in dialogue, where the same referent may be introduced by one person and maintained by another person? An experiment was conducted in which participants either told entire stories to each other or told stories together, thus enabling us to contrast situations in which characters were introduced and maintained by the same person (control condition) and situations in which the introduction and the maintaining of each character were performed by different people (alternating condition). Story complexity was also manipulated through the introduction of one or two characters in each story. We found that participants were less likely to use reduced forms to maintain referents in the alternating condition. The use of reduced forms also depended on the context in which the referent was maintained (in particular, first or second mention of a character) and on story complexity. These results shed light on how the pressure to signal understanding to one's conversational partner affects referential choices throughout the interaction.

Referential adjustment during discourse production in Alzheimer's disease

Several studies have shown that people with Alzheimer's disease (AD) tend to use more pronouns than healthy aged adults when referring to entities during discourse. This referential behavior has been associated with the decrease of cognitive abilities, such as lexical retrieval difficulties or reduced abilities in working memory. However, the influence of certain important discourse factors on the referential choices made by people with AD has yet to be established. This study examines referential choices made at three discourse stages during narrative discourse (the introduction of a referent, the maintaining of the referent in focus, and the shift from one referent in focus to another). These referential choices are examined in increasingly complex referential contexts. In addition, this study investigates the relationships between referential choices and various cognitive abilities. To do so, the narrative discourses of 21 people with AD and 21 healthy adults were elicited using a newly developed storytelling in sequence task. The analyses focused on the production of three major referential expressions (indefinite expressions, definite expressions and pronouns) which are expected to vary according to discourse stage and the referential complexity of the stories. The results show that AD participants produce significantly fewer of the referential expressions expected at the introduction and shift stages than healthy aged adults produce. Nevertheless, the variation in the categories of referential expressions produced by the AD participants between the discourse stages is similar to that produced by the healthy aged adults, suggesting a preserved sensitivity to the factors manipulated in the task (i.e., discourse stages and referential complexity). This study also highlights the fact that different cognitive competences, especially executive abilities, are greatly involved in referential choices. The results add further evidence that referential choices rely on a variety of cognitive skills, depending on the discourse context in which they are made.

The Role of Animacy in Children's Interpretation of Relative Clauses in English: Evidence From Sentence-Picture Matching and Eye Movements

Subject relative clauses (SRCs) are typically processed more easily than object relative clauses (ORCs), but this difference is diminished by an inanimate head-noun in semantically non-reversible ORCs ("The book that the boy is reading"). In two eye-tracking experiments, we investigated the influence of animacy on online processing of semantically reversible SRCs and ORCs using lexically inanimate items that were perceptually animate due to motion (e.g., "Where is the tractor that the cow is chasing"). In Experiment 1, 48 children (aged 4;5-6;4) and 32 adults listened to sentences that varied in the lexical animacy of the NP1 head-noun (Animate/Inanimate) and relative clause (RC) type (SRC/ORC) with an animate NP2 while viewing two images depicting opposite actions. As expected, inanimate head-nouns facilitated the correct interpretation of ORCs in children; however, online data revealed children were more likely to anticipate an SRC as the RC unfolded when an inanimate head-noun was used, suggesting processing was sensitive to perceptual animacy. In Experiment 2, we repeated our design with inanimate (rather than animate) NP2s (e.g., "where is the tractor that the car is following") to investigate whether our online findings were due to increased visual surprisal at an inanimate as agent, or to similarity-based interference. We again found greater anticipation for an SRC in the inanimate condition, supporting our surprisal hypothesis. Across the experiments, offline measures show that lexical animacy influenced children's interpretation of ORCs, whereas online measures reveal that as RCs unfolded, children were sensitive to the perceptual animacy of lexically inanimate NPs, which was not reflected in the offline data. Overall measures of syntactic comprehension, inhibitory control, and verbal short-term memory and working memory were not predictive of children's accuracy in RC interpretation, with the exception of a positive correlation with a standardized measure of syntactic comprehension in Experiment 1.

"A cruel king" is not the same as "a king who is cruel": Modifier position affects how words are encoded and retrieved from memory

We examined whether the position of modifiers in English influences how words are encoded and subsequently retrieved from memory. Compared with premodifiers, postmodifiers might confer more perceptual significance to the associated head nouns, are more consistent with the "given-before-new" information structure, and might also be easier to integrate because the head noun is available before the modifications are encountered. In 4 experiments, we investigated whether premodified (the cruel and merciless king), and postmodified (the king who was cruel and merciless) noun phrases (henceforth, NPs) could induce variations in ease of subsequent retrieval. In Experiments 1, 2, and 3, participants used more pronouns (he), as opposed to full descriptions (the king) to refer to postmodified NPs than to unmodified competitors, but pronominal reference to premodified NPs and unmodified competitors did not differ, suggesting that postmodified NPs are more accessible in memory. When the data from all 3 experiments were combined, we also observed significantly more pronominal reference to post- than to premodified NPs, as well as a greater increase in pronominal reference rates between postmodified NPs and unmodified competitors than between premodified NPs and unmodified competitors. In Experiment 4, words following critical pronouns were read faster when the pronouns referred to modified than to unmodified NPs, and also when the pronouns referred to post- rather than premodified NPs. Taken together, our results show enhanced retrieval facilitation for postmodified NPs compared with premodified NPs. These results are the first to demonstrate that the linear position of modifications results in measurable processing cost at a subsequent point. The results have important implications for memory-based theories of language processing, and also for theories assigning a central role for discourse status and information structure during sentence processing. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

A Mechanistic Framework for Explaining Audience Design in Language Production

Audience design refers to the situation in which speakers fashion their utterances so as to cater to the needs of their addressees. In this article, a range of audience design effects are reviewed, organized by a novel cognitive framework for understanding audience design effects. Within this framework, feedforward (or one-shot) production is responsible for feedforward audience design effects, or effects based on already known properties of the addressee (e.g., child versus adult status) or the message (e.g., that it includes meanings that might be confusable). Then, a forward modeling approach is described, whereby speakers independently generate communicatively relevant features to predict potential communicative effects. This can explain recurrent processing audience design effects, or effects based on features of the produced utterance itself or on idiosyncratic features of the addressee or communicative situation. Predictions from the framework are delineated.

Testing the effect of an arbitrary subject pronoun on relative clause comprehension: a study with Hebrew-speaking children

Previous studies have found that Hebrew-speaking children accurately comprehend object relatives (OR) with an embedded non-referential arbitrary subject pronoun (ASP). The facilitation of ORs with embedded pronouns is expected both from a discourse-pragmatics perspective and within a syntax-based locality approach. However, the specific effect of ASP might also be driven by a mismatch in grammatical features between the head noun and the pronoun, or by its relatively undemanding referential properties. We tested these possibilities by comparing ORs whose embedded subject is either ASP, a referential pronoun, or a lexical noun phrase. In all conditions, grammatical features were controlled. In a referent-identification task, the matching features made ORs with embedded pronouns difficult for five-year-olds. Accuracy was particularly low when the embedded pronoun was referential. These results indicate that embedded pronouns do not facilitate ORs across the board, and that the referential properties of pronouns affect OR processing.

Referential Choices in a Collaborative Storytelling Task: Discourse Stages and Referential Complexity Matter

During a narrative discourse, accessibility of the referents is rarely fixed once and for all. Rather, each referent varies in accessibility as the discourse unfolds, depending on the presence and prominence of the other referents. This leads the speaker to use various referential expressions to refer to the main protagonists of the story at different moments in the narrative. This study relies on a new, collaborative storytelling in sequence task designed to assess how speakers adjust their referential choices when they refer to different characters at specific discourse stages corresponding to the introduction, maintaining, or shift of the character in focus, in increasingly complex referential contexts. Referential complexity of the stories was manipulated through variations in the number of characters (1 vs. 2) and, for stories in which there were two characters, in their ambiguity in gender (different vs. same gender). Data were coded for the type of reference markers as well as the type of reference content (i.e., the extent of the information provided in the referential expression). Results showed that, beyond the expected effects of discourse stages on reference markers (more indefinite markers at the introduction stage, more pronouns at the maintaining stage, and more definite markers at the shift stage), the number of characters and their ambiguity in gender also modulated speakers' referential choices at specific discourse stages, For the maintaining stage, an effect of the number of characters was observed for the use of pronouns and of definite markers, with more pronouns when there was a single character, sometimes replaced by definite expressions when two characters were present in the story. For the shift stage, an effect of gender ambiguity was specifically noted for the reference content with more specific information provided in the referential expression when there was referential ambiguity. Reference content is an aspect of referential marking that is rarely addressed in a narrative context, yet it revealed a quite flexible referential behavior by the speakers.

Talking about SOME and ALL: What determines the usage of quantity-denoting expressions?

Reference production is often studied through single dimensions of contrast (e.g., "tall glass" when there are one or two glasses of varying height). Yet real-world communication is rarely so simple, raising questions about the factors guiding more complex referents. The current study examines decisions to mention set relations (e.g., using quantity-denoting expressions like "some of the houses" to refer to 2-out-of-5 houses) versus object categories only (e.g., using bare plurals like "houses"). Two experiments used vignettes to vary discourse focus on objects (prominent vs. non-prominent) and scenes to vary the set type described (subset vs. total set). Speakers were more likely to communicate set relations of prominent objects, particularly when they elicited high name agreement in the case of total sets. Speakers' use of quantity-denoting expressions also increased listeners' sensitivity to set relations in an object-matching task. This suggests that unlike simpler forms of modification that often decrease with greater focus, quantity-denoting expressions provide additional information about the set relations of prominent referents.

Looking at a contrast object before speaking boosts referential informativeness, but is not essential

Variation in referential form has traditionally been accounted for by theoretical frameworks focusing on linguistic and discourse features. Despite the explosion of interest in eye tracking methods in psycholinguistics, the role of visual scanning behaviour in informative reference production is yet to be comprehensively investigated. Here we examine the relationship between speakers' fixations to relevant referents and the form of the referring expressions they produce. Overall, speakers were fully informative across simple and (to a lesser extent) more complex displays, providing appropriately modified referring expressions to enable their addressee to locate the target object. Analysis of contrast fixations revealed that looking at a contrast object boosts but is not essential for full informativeness. Contrast fixations which take place immediately before speaking provide the greatest boost. Informative referring expressions were also associated with later speech onsets than underinformative ones. Based on the finding that fixations during speech planning facilitate but do not fully predict informative referring, direct visual scanning is ruled out as a prerequisite for informativeness. Instead, pragmatic expectations of informativeness may play a more important role. Results are consistent with a goal-based link between eye movements and language processing, here applied for the first time to production processes.

The effects of utterance timing and stimulation of left prefrontal cortex on the production of referential expressions

We examined the relationship between the timing of utterance initiation and the choice of referring expressions, e.g., pronouns (it), zeros (…and went down), or descriptive NPs (the pink pentagon). We examined language production in healthy adults, and used anodal transcranial direct current stimulation (tDCS) to test the involvement of the left prefrontal cortex (PFC) in the timing of utterance production and the selection of reference forms in a discourse context. Twenty-two subjects (11 anodal, 11sham) described fast-paced actions, e.g. The gray oval flashes, then it moves right 2 blocks. We only examined trials in contexts that supported pronoun/zero use. For sham participants, pronouns/zeros increased on trials with longer latencies to initiate the target utterance, and trials where the previous trial was short. We argue that both of these conditions enabled greater message pre-planning and greater discourse connectedness: The strongest predictor of pronoun/zero usage was the presence of a connector word like and or then, which was also tended to occur on trials with longer latencies. For the anodal participants, the latency effect disappeared. PFC stimulation appeared to enable participants to produce utterances with greater discourse connectedness, even while planning incrementally.

Exploring socioeconomic differences in syntactic development through the lens of real-time processing

Differences in caregiver input across socioeconomic status (SES) predict syntactic development, but the mechanisms are not well understood. Input effects may reflect the exposure needed to acquire syntactic representations during learning (e.g., does the child have the relevant structures for passive sentences?) or access this knowledge during communication (e.g., can she use the past participle to infer the meaning of passives?). Using an eye-tracking and act-out paradigm, the current study distinguishes these mechanisms by comparing the interpretation of actives and passives in 3- to 7-year-olds (n=129) from varying SES backgrounds. During the presentation of spoken sentences, fixations revealed robust disambiguation of constructions by children from higher-SES backgrounds, but less sensitivity by lower-SES counterparts. After sentence presentation, decreased sensitivity generated interpretive challenges and average SES-related differences for passives requiring syntactic revision ("The seal is quickly eaten by it"). Critically, no differences were found when revision was not needed ("It is quickly eaten by the seal"). These results suggest that all children shared an ability to acquire passives, but SES-related differences in real-time processing can impact the accuracy of utterance interpretation.

Explicit and Emergent Mechanisms of Information Status

It is well established that language production and comprehension are influenced by information status, for example, whether information is given, new, topical, or predictable, and many scholars suggest that an important component of information status is keeping track of what information is in common ground (i.e., what is shared), and what is not. Information status affects both speakers' choices (e.g., word order, pronoun use, prosodic prominence) and how listeners interpret the speaker's meaning (e.g., Chafe, 1994; Prince, 1981). Although there is a wealth of scholarly work on information status (for a review, see Arnold, Kaiser, Kahn, & Kim, 2013), there is no consensus on the mechanisms by which it is used, and in fact relatively little discussion of the underlying representations and psycholinguistic mechanisms. Moreover, a major challenge to understanding information status is that its effects are notoriously variable. This study considers existing proposals about information status, focusing on two questions: (a) how is it represented; and (b) by what mechanisms is it used? I propose that it is important to consider whether representations and mechanisms can be classified as either explicit or emergent. Based on a review of existing evidence, I argue that information status representations are most likely emergent, but the mechanisms by which they are used are both explicit and emergent. This review provides one of the first considerations of information status processing across multiple domains.

Referential Choice: Predictability and Its Limits

We report a study of referential choice in discourse production, understood as the choice between various types of referential devices, such as pronouns and full noun phrases. Our goal is to predict referential choice, and to explore to what extent such prediction is possible. Our approach to referential choice includes a cognitively informed theoretical component, corpus analysis, machine learning methods and experimentation with human participants. Machine learning algorithms make use of 25 factors, including referent's properties (such as animacy and protagonism), the distance between a referential expression and its antecedent, the antecedent's syntactic role, and so on. Having found the predictions of our algorithm to coincide with the original almost 90% of the time, we hypothesized that fully accurate prediction is not possible because, in many situations, more than one referential option is available. This hypothesis was supported by an experimental study, in which participants answered questions about either the original text in the corpus, or about a text modified in accordance with the algorithm's prediction. Proportions of correct answers to these questions, as well as participants' rating of the questions' difficulty, suggested that divergences between the algorithm's prediction and the original referential device in the corpus occur overwhelmingly in situations where the referential choice is not categorical.

Referential choice in a second language: evidence for a listener-oriented approach

One central question in research on spoken language communication concerns how speakers decide how explicit to make a referential expression. In the present paper, we address the debate between a discourse-based approach and a listener-based approach to the choice of referring expressions by testing second language (L2) learners of English on the production of English referential expressions, and comparing their performance to a group of monolingual speakers of English. In two experiments, we found that when native speakers of English use full noun phrases, the L2 speakers tend to choose a pronoun, even when the use of a pronoun leads to ambiguity. Our results show that the pattern observed is not the result of cross-linguistic interference from the L1. Furthermore, a clear dissociation is found between calculating the discourse information and taking the listener's perspective into account, supporting a listener's based approach to the choice of referring expressions.

Good-enough linguistic representations and online cognitive equilibrium in language processing

We review previous research showing that representations formed during language processing are sometimes just “good enough” for the task at hand and propose the “online cognitive equilibrium” hypothesis as the driving force behind the formation of good-enough representations in language processing. Based on this view, we assume that the language comprehension system by default prefers to achieve as early as possible and remain as long as possible in a state of cognitive equilibrium where linguistic representations are successfully incorporated with existing knowledge structures (i.e., schemata) so that a meaningful and coherent overall representation is formed, and uncertainty is resolved or at least minimized. We also argue that the online equilibrium hypothesis is consistent with current theories of language processing, which maintain that linguistic representations are formed through a complex interplay between simple heuristics and deep syntactic algorithms and also theories that hold that linguistic representations are often incomplete and lacking in detail. We also propose a model of language processing that makes use of both heuristic and algorithmic processing, is sensitive to online cognitive equilibrium, and, we argue, is capable of explaining the formation of underspecified representations. We review previous findings providing evidence for underspecification in relation to this hypothesis and the associated language processing model and argue that most of these findings are compatible with them.

The art of common ground: emergence of a complex pragmatic language skill in adolescents with autism spectrum disorders

Deficits in pragmatic language are central to autism spectrum disorder (ASD). Here we investigate common ground, a pragmatic language skill in which speakers adjust the contents of their speech based on their interlocutor's perceived knowledge, in adolescents with ASD and typical development (TD), using an experimental narrative paradigm. Consistent with prior research, TD participants produced shorter narrations when they shared knowledge with an interlocutor, an effect not observed at the group level in ASD. This effect was unrelated to general skills such as IQ or receptive vocabulary. In ASD, the effect was correlated with age and symptom severity: older and less severely affected participants did shorten their narratives. Several metrics (including explicit references to common ground, speech disfluencies, and communicative quality ratings) suggested that, although adolescents with ASD did not show implicit reductions in their narrative length, they were aware of common ground, and communicated differently in its presence.

Referential Ambiguity in the Narrative Productions of African American Adults

PURPOSE

The purpose of this study was to examine the production of referential ambiguities in two contrasting narrative conditions among age-defined groups of healthy African American women.

METHOD

Twenty middle-aged adults (M = 51 years) and 20 older adults (M = 72 years) produced a complex story retelling and a personal narrative. All narratives were transcribed orthographically, parsed into T-units, and analyzed for surface structure markings of referents and the presence of ambiguities.

RESULTS

The results demonstrated that older adults produced more ambiguities than middle-aged adults, were more compromised with task complexity, used more role or relation designations to refer to story characters while underusing proper names, and exhibited significant lexical retrieval deficits during ongoing narrative production. Middle-aged adults produced more proper names, but were also challenged by the complexity of the story-retelling task. Moreover, the results showed that older adults produced more African American English variants than middle-aged adults.

CONCLUSION

This investigation revealed a pattern of age-related ambiguities during narrative production. The results demonstrated that lexical retrieval from long-term semantic memory was an important predictor of ambiguity, whereas African American English contributed negligibly. These results show that referential ambiguities may be a robust characteristic of cognitive-linguistic changes that occur with typical aging.

Monolingual and bilingual preschoolers' use of gestures to interpret ambiguous pronouns

Young children typically do not use order-of-mention to resolve ambiguous pronouns, but may do so if given additional cues, such as gestures. Additionally, this ability to utilize gestures may be enhanced in bilingual children, who may be more sensitive to such cues due to their unique language experience. We asked monolingual and bilingual four-year-olds and adults to determine referents of ambiguous pronouns given order-of-mention and co-referential localizing gestures. Results showed that bilingual children, like adults, but not monolingual children, used order-of-mention with gestures to resolve ambiguous pronouns. This highlights a wider implication of bilingualism for socio-cognitive development in children.

Effects of Psychological Attention on Pronoun Comprehension

Pronoun comprehension is facilitated for referents that are focused in the discourse context. Discourse focus has been described as a function of attention, especially shared attention, but few studies have explicitly tested this idea. Two experiments used an exogenous capture cue paradigm to demonstrate that listeners' visual attention at the onset of a story influences their preferences during pronoun resolution later in the story. In both experiments trial-initial attention modulated listeners' transitory biases while considering referents for the pronoun, whether it was in response to the capture cue or not. These biases even had a small influence on listeners' final interpretation of the pronoun. These results provide independently-motivated evidence that the listener's attention influences the on-line processes of pronoun comprehension. Trial-initial attentional shifts were made on the basis of non-shared, private information, demonstrating that attentional effects on pronoun comprehension are not restricted to shared attention among interlocutors.

Is anaphoric reference cooperative?

Two experiments investigated whether the choice of anaphoric expression is affected by the presence of an addressee. Following a context sentence and visual scene, participants described a target scene that required anaphoric reference. They described the scene either to an addressee (Experiment 1) or without an addressee (Experiment 2). When an addressee was present in the task, participants used more pronouns and fewer repeated noun phrases when the referent was the grammatical subject in the context sentence than when it was the grammatical object and they used more pronouns when there was no competitor than when there was. They used fewer pronouns and more repeated noun phrases when a visual competitor was present in the scene than when there was no visual competitor. In the absence of an addressee, linguistic context effects were the same as those when an addressee was present, but the visual effect of the competitor disappeared. We conclude that visual salience effects are due to adjustments that speakers make when they produce reference for an addressee, whereas linguistic salience effects appear whether or not speakers have addressees.