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.

Does it pay to imitate? No evidence for social gains from lexical imitation

According to an influential hypothesis, people imitate motor movements to foster social interactions. Could imitation of language serve a similar function? We investigated this question in two pre-registered experiments. In Experiment 1, participants were asked to alternate naming pictures and matching pictures to a name provided by a partner. Crucially, and unknown to participants, the partner was in fact a computer program which in one group produced the same names as previously used by the participant, and in the other group consistently produced different names. We found no difference in how the two groups evaluated the partner or the interaction and no difference in their willingness to cooperate with the partner. In Experiment 2, we made the task more similar to natural interactions by adding a stage in which a participant and the partner introduced themselves to each other and included a measure of the participant's autistic traits. Once again, we found no effects of being imitated. We discuss how these null results may inform imitation research.

Autistic children's language imitation shows reduced sensitivity to ostracism

In dialogue, speakers tend to imitate, or align with, a partner's language choices. Higher levels of alignment facilitate communication and can be elicited by affiliation goals. Since autistic children have interaction and communication impairments, we investigated whether a failure to display affiliative language imitation contributes to their conversational difficulties. We measured autistic children's lexical alignment with a partner, following an ostracism manipulation which induces affiliative motivation in typical adults and children. While autistic children demonstrated lexical alignment, we observed no affiliative influence on ostracised children's tendency to align, relative to controls. Our results suggest that increased language imitation-a potentially valuable form of social adaptation-is unavailable to autistic children, which may reflect their impaired affective understanding.

Speakers extrapolate community-level knowledge from individual linguistic encounters

Speakers' lexical choices are affected by interpersonal-level influences, like a tendency to reuse an interlocutor's words. Here, we examined how those choices are additionally affected by community-level factors, like whether the interlocutor is from their own or another speech community (in-community vs. out-community partner), and how such interpersonal experiences contribute to the acquisition of community-level linguistic knowledge. Our three experiments tested (i) how speakers' lexical choices varied depending on their partner's choices and speech community, and (ii) how speakers' extrapolation of these choices to a subsequent partner was influenced by their partners' speech communities. In Experiment 1, Spanish participants played two sessions of an online picture-matching-and-naming task, encountering the same pictures but different confederates in each session. The first confederate was either an in-community partner (Spanish) or an out-community partner (Latin American); the second confederate was either from the same community as the first confederate or not. Participants' referential choices in Session 1 were influenced by their partner's choices, but not by their community. However, participants' likelihood to subsequently maintain these choices was affected by their partners' communities. Experiment 2 replicated this pattern in Mexicans, and Experiment 3 confirmed that these results were driven by confederates' communities, rather than perceived linguistic status. Our results suggest that speakers encode speech community information during dialogue and store it to inform future contexts of language use, even when it has not affected their choices during that particular encounter. Thus, speakers learn community-level knowledge by extrapolating linguistic information from interpersonal-level experiences.

Lexical entrainment reflects a stable individual trait: Implications for individual differences in language processing

Language use is intrinsically variable, such that the words we use vary widely across speakers and communicative situations. For instance, we can call the same entity refrigerator or fridge. However, attempts to understand individual differences in how we process language have made surprisingly little progress, perhaps because most psycholinguistic instruments are better-suited to experimental comparisons than differential analyses. In particular, investigations of individual differences require instruments that have high test-retest reliability, such that they consistently distinguish between individuals across measurement sessions. Here, we established the reliability of an instrument measuring lexical entrainment, or the tendency to use a name that a partner has used before (e.g., using refrigerator after a partner used refrigerator), which is a key phenomenon for the psycholinguistics of dialogue. Online participants completed two sessions of a picture matching-and-naming task, using different pictures and different (scripted) partners in each session. Entrainment was measured as the proportion of trials on which participants followed their partner in using a low-frequency name, and we assessed reliability by comparing entrainment scores across sessions. The estimated reliability was substantial, both when sessions were separated by minutes and when sessions were a week apart. These results suggest that our instrument is well-suited for differential analyses, opening new avenues for understanding language variability. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

How do phonology and orthography feed back to influence syntactic encoding in language production? Evidence from structural priming in Mandarin

Do speakers make use of a word's phonological and orthographic forms to determine the syntactic structure of a sentence? We reported two Mandarin structural priming experiments involving homophones to investigate word-form feedback on syntactic encoding. Participants tended to reuse the syntactic structure across sentences; such a structural priming effect was enhanced when the prime and target sentences used homophone verbs (the homophone boost), regardless of whether the homophones were heterographic (homophones written in different character; Experiments 1 and 2) or homographic (homophones written in the same character; Experiment 2). Critically, the homophone boost was comparable between homographic and heterographic homophone primes (Experiment 2). Hence unlike phonology, orthography appears to play a minimal role in mediating structural priming in production. We suggest that the homophone boost results from lemma associations between homophones that develop due to phonological identity between homophones early during language learning; such associations stabilise before literacy acquisition, thus limiting the influence of orthographic identity on lemma association between homophones and in turn on structural priming in language production.

Children show selectively increased language imitation after experiencing ostracism

When threatened with ostracism, children attempt to strengthen social relationships by engaging in affiliative behaviors such as imitation. We investigated whether an experience of ostracism influenced the extent to which children imitated a partner's language use. In two experiments, 7- to 12-year-old children either experienced ostracism or did not experience ostracism in a virtual ball-throwing game before playing a picture-matching game with a partner. We measured children's tendency to imitate, or align with, their partner's language choices during the picture-matching game. Children showed a strong tendency to spontaneously align with their partner's lexical and grammatical choices. Crucially, their likelihood of lexical alignment was modulated by whether they had experienced ostracism. We found no effect of ostracism on syntactic alignment. These findings offer the first demonstration that ostracism selectively influences children's language use. They highlight the role of social-affective factors in children's communicative development, and show that the link between ostracism and imitation is broadly based, and extends beyond motor behaviors to the domain of language. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Interaction Promotes the Adaptation of Referential Conventions to the Communicative Context

Coordination between speakers in dialogue requires balancing repetition and change, the old and the new. Interlocutors tend to reuse established forms, relying on communicative precedents. Yet linguistic interaction also necessitates adaptation to changing contexts or dynamic tasks, which might favor abandoning existing precedents in favor of better communicative alternatives. We explored this tension using a maze game task in which individual participants and interacting pairs had to describe figures and their positions in one of two possible maze types: a regular maze, in which the grid-like structure of the maze is highlighted, and an irregular maze, in which specific parts of the maze are salient. Participants repeated this task several times. Both individuals and interacting pairs were affected by the different maze layouts, initially using more idiosyncratic description schemes for irregular mazes and more systematic schemes for regular mazes. Interacting pairs, but not individuals, abandoned their unsystematic initial descriptions in favor of a more systematic approach, which was better adapted for repeated interaction. Our results show communicative conventions are initially shaped by context, but interaction opens up the possibility for change if better alternatives are available.

Shared neural representations of syntax during online dyadic communication

When people communicate, they come to see the world in a similar way to each other by aligning their mental representations at such levels as syntax. Syntax is an essential feature of human language that distinguishes humans from other non-human animals. However, whether and how communicators share neural representations of syntax is not well understood. Here we addressed this issue by measuring the brain activity of both communicators in a series of dyadic communication contexts, by using functional near-infrared spectroscopy (fNIRS)-based hyperscanning. Two communicators alternatively spoke sentences either with the same or with different syntactic structures. Results showed a significantly higher-level increase of interpersonal neural synchronization (INS) at right posterior superior temporal cortex when communicators produced the same syntactic structures as each other compared to when they produced different syntactic structures. These increases of INS correlated significantly with communication quality. Our findings provide initial evidence for shared neural representations of syntax between communicators.

Priming sentence comprehension in aphasia: Effects of lexically independent and specific structural priming

PURPOSE

Impaired message-structure mapping results in deficits in both sentence production and comprehension in aphasia. Structural priming has been shown to facilitate syntactic production for persons with aphasia (PWA). However, it remains unknown if structural priming is also effective in sentence comprehension. We examined if PWA show preserved and lasting structural priming effects during interpretation of syntactically ambiguous sentences and if the priming effects occur independently of or in conjunction with lexical (verb) information.

METHODS

Eighteen PWA and 20 healthy older adults (HOA) completed a written sentence-picture matching task involving the interpretation of prepositional phrases (PP; the chef is poking the solider with an umbrella) that were ambiguous between high (verb modifier) and low attachment (object noun modifier). Only one interpretation was possible for prime sentences, while both interpretations were possible for target sentences. In Experiment 1, the target was presented immediately after the prime (0-lag). In Experiment 2, two filler items intervened between the prime and the target (2-lag). Within each experiment, the verb was repeated for half of the prime-target pairs, while different verbs were used for the other half. Participants' off-line picture matching choices and response times were measured.

RESULTS

After reading a prime sentence with a particular interpretation, HOA and PWA tended to interpret an ambiguous PP in a target sentence in the same way and with faster response times. Importantly, both groups continued to show this priming effect over a lag (Experiment 2), although the effect was not as reliable in response times. However, neither group showed lexical (verb-specific) boost on priming, deviating from robust lexical boost seen in the young adults of prior studies.

CONCLUSIONS

PWA demonstrate abstract (lexically-independent) structural priming in the absence of a lexically-specific boost. Abstract priming is preserved in aphasia, effectively facilitating not only immediate but also longer-lasting structure-message mapping during sentence comprehension.

Language experience modulates bilingual language control: The effect of proficiency, age of acquisition, and exposure on language switching

The ability to selectively access two languages characterises the bilingual everyday experience. Previous studies showed the role of second language (L2) proficiency, as a proxy for dominance, on language control. However, the role of other aspects of the bilingual experience - such as age of acquisition and daily exposure - are relatively unexplored. In this study, we used a cued language switching task to examine language switching and mixing in two groups of highly proficient bilinguals with different linguistic backgrounds, to understand how the ability to control languages is shaped by linguistic experience. Our analysis shows that the ability to switch between languages is not only modulated by L2 proficiency, but also by daily L2 exposure. Daily L2 exposure also affects language mixing. Finally, L2 age of acquisition predicts naming latencies in the L2. Together, these findings show that language dominance is characterised by multiple aspects of the bilingual experience, which modulate language control.

Does language similarity affect representational integration?

Previous studies have suggested that multilingual speakers do not represent their languages entirely separately but instead share some representations across languages. To determine whether sharing is affected by language similarity, we investigated whether participants' tendency to repeat syntax across languages was affected by language similarity. In three cross-linguistic structural priming experiments, trilingual Mandarin-Cantonese-English participants heard a sentence in Cantonese or English (which they matched to a picture) and then described a dative event in Mandarin. When prime and target sentences involved different actions (Experiment 1), structural priming was unaffected by language similarity. But when prime and target involved the same action (Experiments 2 and 3), priming was stronger between related languages (i.e., Cantonese to Mandarin) than unrelated languages (i.e., English to Mandarin). Similar languages are not more integrated than dissimilar languages overall, but the representations that connect lexical and syntactic information are more closely integrated.

Inhibitory control and lexical alignment in children with an autism spectrum disorder

BACKGROUND

Two experiments investigated the contribution of conflict inhibition to pragmatic deficits in children with autism spectrum disorder (ASD). Typical adults' tendency to reuse interlocutors' referential choices (lexical alignment) implicates communicative perspective-taking, which is regulated by conflict inhibition. We examined whether children with ASD spontaneously lexically aligned, and whether conflict inhibition mediated alignment.

METHODS

Children with ASD and chronological- and verbal-age-matched typically developing controls played a picture-naming game. We manipulated whether the experimenter used a preferred or dispreferred name for each picture, and examined whether children subsequently used the same name.

RESULTS

Children with ASD spontaneously lexically aligned, to the same extent as typically developing controls. Alignment was unrelated to conflict inhibition in both groups.

CONCLUSIONS

Children with ASD's referential communication is robust to impairments in conflict inhibition under some circumstances. Their pragmatic deficits may be mitigated in a highly structured interaction.

Do you what I say? People reconstruct the syntax of anomalous utterances

We frequently experience and successfully process anomalous utterances. Here we examine whether people do this by 'correcting' syntactic anomalies to yield well-formed representations. In two structural priming experiments, participants' syntactic choices in picture description were influenced as strongly by previously comprehended anomalous (missing-verb) prime sentences as by well-formed prime sentences. Our results suggest that comprehenders can reconstruct the constituent structure of anomalous utterances - even when such utterances lack a major structural component such as the verb. These results also imply that structural alignment in dialogue is unaffected if one interlocutor produces anomalous utterances.

Consistent and cumulative effects of syntactic experience in children's sentence production: Evidence for error-based implicit learning

Error-based implicit learning models (e.g., Chang, Dell, & Bock, 2006) propose that a single learning mechanism underlies immediate and long-term effects of experience on children's syntax. We test two key predictions of these models: That individual experiences of infrequent structures should yield both immediate and long-term facilitation, and that such learning should be consistent in individual speakers across time. Children (and adults) described transitive events in two picture-matching games, held a week apart. In both sessions, the experimenter's immediately preceding syntax (active vs. passive) dynamically influenced children's (and adults') syntactic choices in an individually consistent manner. Moreover, children showed long-term facilitation, through an increased likelihood to produce passives in Session 2, with speakers who were most likely to immediately repeat passives in Session 1 being most likely to produce passives in Session 2. Our results are consistent with an error-based syntactic learning mechanism that operates across the lifespan.

Do You Know What I Know? The Impact of Participant Role in Children's Referential Communication

For successful language use, interlocutors must be able to accurately assess their shared knowledge ("common ground"). Such knowledge can be accumulated through linguistic and non-linguistic context, but the same context can be associated with different patterns of knowledge, depending on the interlocutor's participant role (Wilkes-Gibbs and Clark, 1992). Although there is substantial evidence that children's ability to model partners' knowledge develops gradually, most such evidence focuses on non-linguistic context. We investigated the extent to which 8- to 10-year-old children can assess common ground developed through prior linguistic context, and whether this is sensitive to variations in participant role. Children repeatedly described tangram figures to another child, and then described the same figures to a third child who had been a side-participant, an overhearer, or absent during the initial conversation. Children showed evidence of partner modeling, producing shorter referential expressions with repeated mention to the same partner. Moreover, they demonstrated sensitivity to differences in common ground with the third child based on participant role on some but not all measures (e.g., description length, but not definiteness). Our results suggest that by ten, children make distinctions about common ground accumulated through prior linguistic context but do not yet consistently deploy this knowledge in an adult-like way.

Processing compound words: Evidence from synaesthesia

This study used grapheme-colour synaesthesia, a neurological condition where letters evoke a strong and consistent impression of colour, as a tool to investigate normal language processing. For two sets of compound words varying by lexical frequency (e.g., football vs lifevest) or semantic transparency (e.g., flagpole vs magpie), we asked 19 grapheme-colour synaesthetes to choose their dominant synaesthetic colour using an online colour palette. Synaesthetes could then select a second synaesthetic colour for each word if they experienced one. For each word, we measured the number of elicited synaesthetic colours (zero, one, or two) and the nature of those colours (in terms of their saturation and luminance values). In the first analysis, we found that the number of colours was significantly influenced by compound frequency, such that the probability of a one-colour response increased with frequency. However, semantic transparency did not influence the number of synaesthetic colours. In the second analysis, we found that the luminance of the dominant colour was predicted by the frequency of the first constituent (e.g. rain in rainbow). We also found that the dominant colour was significantly more luminant than the secondary colour. Our results show the influence of implicit linguistic measures on synaesthetic colours, and support multiple/dual-route models of compound processing.

Dispatch-assisted CPR: where are the hold-ups during calls to emergency dispatchers? A preliminary analysis of caller-dispatcher interactions during out-of-hospital cardiac arrest using a novel call transcription technique

BACKGROUND

Survival from out-of-hospital cardiac arrest (OHCA) is dependent on the chain of survival. Early recognition of cardiac arrest and provision of bystander cardiopulmonary resuscitation (CPR) are key determinants of OHCA survival. Emergency medical dispatchers play a key role in cardiac arrest recognition and giving telephone CPR advice. The interaction between caller and dispatcher can influence the time to bystander CPR and quality of resuscitation. We sought to pilot the use of emergency call transcription to audit and evaluate the holdups in performing dispatch-assisted CPR.

METHODS

A retrospective case selection of 50 consecutive suspected OHCA was performed. Audio recordings of calls were downloaded from the emergency medical dispatch centre computer database. All calls were transcribed using proprietary software and voice dialogue was compared with the corresponding stage on the Medical Priority Dispatch System (MPDS). Time to progress through each stage and number of caller-dispatcher interactions were calculated.

RESULTS

Of the 50 downloaded calls, 47 were confirmed cases of OHCA. Call transcription was successfully completed for all OHCA calls. Bystander CPR was performed in 39 (83%) of these. In the remaining cases, the caller decided the patient was beyond help (n = 7) or the caller said that they were physically unable to perform CPR (n = 1). MPDS stages varied substantially in time to completion. Stage 9 (determining if the patient is breathing through airway instructions) took the longest time to complete (median = 59 s, IQR 22-82 s). Stage 11 (giving CPR instructions) also took a relatively longer time to complete compared to the other stages (median = 46 s, IQR 37-75 s). Stage 5 (establishing the patient's age) took the shortest time to complete (median = 5.5s, IQR 3-9s).

CONCLUSION

Transcription of OHCA emergency calls and caller-dispatcher interaction compared to MPDS stage is feasible. Confirming whether a patient is breathing and completing CPR instructions required the longest time and most interactions between caller and dispatcher. Use of call transcription has the potential to identify key factors in caller-dispatcher interaction that could improve time to CPR and further research is warranted in this area.

The relationship between sentence meaning and word order: evidence from structural priming in German

Most theories of human language production assume that generating a sentence involves several stages, including an initial stage where the prelinguistic message is determined and a subsequent stage of grammatical encoding. However, it is contentious whether grammatical encoding involves separate stages of grammatical-function assignment and linearization. To address this question, we examined the mapping between the message level and grammatical encoding in two structural priming experiments in which German speakers choose between three different structures expressing ditransitive events. Although speakers showed a tendency to repeat the order of constituents (noun phrase-prepositional phrase, NP-PP, vs. NP-NP), they were additionally primed to repeat the order of thematic roles when constituent structure was constant (NPRECIPIENT-NPTHEME vs. NPTHEME-NPRECIPIENT). Experiment 2 found that the latter effect could not be due to persistence of the order of phrases referring to animate and inanimate entities. These results suggest a direct mapping of thematic roles to word order, consistent with a model in which the message is mapped onto syntactic structure in a single stage.

Is children's acquisition of the passive a staged process? Evidence from six- and nine-year-olds' production of passives

We report a syntactic priming experiment that examined whether children's acquisition of the passive is a staged process, with acquisition of constituent structure preceding acquisition of thematic role mappings. Six-year-olds and nine-year-olds described transitive actions after hearing active and passive prime descriptions involving the same or different thematic roles. Both groups showed a strong tendency to reuse in their own description the syntactic structure they had just heard, including well-formed passives after passive primes, irrespective of whether thematic roles were repeated between prime and target. However, following passive primes, six-year-olds but not nine-year-olds also produced reversed passives, with well-formed constituent structure but incorrect thematic role mappings. These results suggest that by six, children have mastered the constituent structure of the passive; however, they have not yet mastered the non-canonical thematic role mapping. By nine, children have mastered both the syntactic and thematic dimensions of this structure.

Persistent structural priming and frequency effects during comprehension

We report 2 experiments using a sentence-picture matching task concerned with the interpretation of prepositional phrases that were ambiguous between high and low attachment (Branigan, Pickering, & McLean, 2005). After reading a prime sentence with a particular interpretation, participants tended to interpret an ambiguous prepositional phrase in a target sentence in the same way, whether the prime and target sentences used the same verb (Experiment 1) or used different verbs (Experiment 2). Both experiments also found that these effects were unaffected by whether prime and target sentences were adjacent or separated by 1 or 2 "fillers" consisting of sentences and pictures unrelated to the prime and target. We argue that both lexically independent and lexically specific structural priming effects occur in comprehension, and may persist, and suggest that a common mechanism may underlie structural priming effects and at least some lexically specific and lexically independent frequency effects in comprehension.

Evidence for (shared) abstract structure underlying children's short and full passives

In a syntactic priming paradigm, three- and four-year-old children and adults described transitive events after hearing thematically and lexically unrelated active and short passive prime descriptions. Both groups were more likely to produce full passive descriptions (the king is being scratched by the tiger) following short passive primes (the girls are being shocked) than active primes (the sheep is shocking the girl). These results suggest that by four, children have (shared) abstract syntactic representations for both short and full passives, contrary to previous proposals (e.g., Horgan, 1978).

The role of beliefs in lexical alignment: evidence from dialogs with humans and computers

Five experiments examined the extent to which speakers' alignment (i.e., convergence) on words in dialog is mediated by beliefs about their interlocutor. To do this, we told participants that they were interacting with another person or a computer in a task in which they alternated between selecting pictures that matched their 'partner's' descriptions and naming pictures themselves (though in reality all responses were scripted). In both text- and speech-based dialog, participants tended to repeat their partner's choice of referring expression. However, they showed a stronger tendency to align with 'computer' than with 'human' partners, and with computers that were presented as less capable than with computers that were presented as more capable. The tendency to align therefore appears to be mediated by beliefs, with the relevant beliefs relating to an interlocutor's perceived communicative capacity.

Determiner selection in romance languages: evidence from French

Determiner selection requires the retrieval of the noun's syntactic features (e.g., gender) and sometimes of its phonological features. Miozzo and Caramazza (1999) argued that the selection of determiners in Germanic languages is more straightforward than in Romance languages because it is not dependent on the phonological properties of the following word. In the present study, we used the picture-word interference paradigm to investigate the dependency of the determiner on the noun's features in French. In 3 experiments, we found a gender congruency effect at +200 stimulus onset asynchrony (SOA), indicating that participants were slower to produce the name of a picture (determiner + noun) when the picture-word pair was incongruent in gender than when it was congruent. We failed to replicate this effect at 0 SOA, in line with previous studies (Alario & Caramazza, 2002). Our results suggest that the features involved in determiner selection are not language specific but rather are specific to the determiner system.

Is the 'naming' deficit in dyslexia a misnomer?

We report a study that investigated the widely held belief that naming-speed deficits in developmental dyslexia reflect impaired access to lexical-phonological codes. To investigate this issue, we compared adult dyslexic and adult non-dyslexic readers' performance when naming and semantically categorizing arrays of objects. Dyslexic readers yielded slower response latencies than non-dyslexic readers when naming objects, but a subsequent comparison of object-naming and object-categorization tasks showed that the apparent 'naming' deficit could be attributed to a more general difficulty in retrieving information - either phonological or semantic - from the visual stimulus. Our findings suggest that although visual-phonological connections may be crucial in explaining naming-speed performance they do not fully characterise dyslexic readers' naming-speed impairments.

Visual deficits in developmental dyslexia: relationships between non-linguistic visual tasks and their contribution to components of reading

Developmental dyslexia is often characterized by a visual deficit, but the nature of this impairment and how it relates to reading ability is disputed (Brain 2003; 126: 841-865). In order to investigate this issue, we compared groups of adults with and without dyslexia on the Ternus, visual-search and symbols tasks. Dyslexic readers yielded more errors on the visual-search and symbols tasks compared with non-dyslexic readers. A positive correlation between visual-search and symbols task performance suggests a common mechanism shared by these tasks. Performance on the visual-search and symbols tasks also correlated with non-word reading and rapid automatized naming measures, and visual search contributed independent variance to non-word reading. The Ternus task did not discriminate reading groups nor contributed significant variance to reading measures. We consider how visual-attention processes might underlie specific component reading measures.

Syntactic alignment and participant role in dialogue

We report three experiments that investigated whether the linguistic behavior of participants in a dialogue is affected by their role within that interaction. All experiments were concerned with the way in which speakers choose between syntactic forms with very similar meanings. Theories of dialogue assume that speakers address their contributions directly to their addressees, but also indirectly to side participants. In Experiments 1 and 2, speakers produced picture descriptions that had the same syntactic structure as a previous speaker's descriptions which had been addressed to a third person. This indicated that syntactic alignment is not limited to speaker-addressee dyads. However, the prior participant role of the current speaker affected alignment: prior addressees aligned more than prior side-participants. In contrast, Experiments 2 and 3 demonstrated that alignment was unaffected by the prior participant role of the current addressee. We interpret these findings in terms of depth of processing during encoding.

Priming prepositional-phrase attachment during comprehension

Strong evidence suggests that prior syntactic context affects language production (e.g., J. K. Bock, 1986). The authors report 4 experiments that used an expression-picture matching task to investigate whether it also affects ambiguity resolution in comprehension. All experiments examined the interpretation of prepositional phrases that were ambiguous between high and low attachment. After reading a prime expression with a high-attached interpretation, participants tended to interpret an ambiguous prepositional phrase in a target expression as highly attached if it contained the same verb as the prime (Experiment 1), but not if it contained a different verb (Experiment 2). They also tended to adopt the high-attached interpretation after producing a prime with the high-attached interpretation that included the same verb (Experiment 3). Finally, they were faster to adopt a high-attached interpretation after reading an expression containing the same verb that was disambiguated to the high-attached versus the low-attached interpretation (Experiment 4).

Do speakers avoid ambiguities during dialogue?

What affects speakers' production of ambiguous utterances in dialogue? They might consider ease of production for themselves, or ease of comprehension for their addressees. Previous research has demonstrated that ease of production plays a role in speakers' syntactic choices, but that ease of comprehension does not. However, such studies have not employed dialogues that involve role swapping on a turn-by-turn basis. In our experiment, participants alternated in giving and following instructions to move objects around on a grid. They tended to repeat the syntactic form just used by their interlocutor, reflecting sensitivity to ease of production. More interestingly, they were more likely to disambiguate their utterances when the visual context was potentially ambiguous than when it was not, reflecting sensitivity to ease of comprehension. We conclude that speakers pay attention to their beliefs about their addressees' ease of comprehension, in addition to considering ease of production for themselves.

Thematic processing of adjuncts: evidence from an eye-tracking experiment

We investigated thematic processing in sentences containing a prepositional phrase that was ambiguous between a locative and a temporal interpretation. We manipulated context (temporal or locative), target sentence (temporal or locative), and whether or not the main verb of the target and the context was repeated. Results showed that context dictated the participants' thematic expectations. Thematically, congruent target and context pairs were read faster than incongruent pairs. This effect was not modulated by verb repetition. We argue that wh-words cause readers to lodge semantically vacuous thematic roles in their discourse representation that bias a reader's interpretation of subsequent thematically ambiguous adjuncts in their discourse representation.

Grammatical gender in the production of single words: some evidence from Greek

The present study investigated the effect of prior grammatical gender information provided by the production of a bare noun on the production of a syntactically unrelated, gender-inflected color adjective. The target language was Greek. A lexical priming task involving picture naming was employed. Participants saw a series of pictures, some in color and some in black-and-white; they had to name a black-and-white picture with the single noun (prime) and a color picture with the appropriately inflected color adjective (target). Prior gender information was shown to affect subsequent production of gender-marked words. The effect was restricted to nouns of one gender class (masculine) only. The implications of these results for the representation and processing of gender in production are discussed.

Syntactic priming in spoken production: linguistic and temporal interference

Current evidence about the persistence of syntactic priming effects (Bock, 1986) is equivocal: Using spoken picture description, Bock and Griffin (2000) found that it persisted over as many as 10 trials; using written sentence completion, Branigan, Pickering, and Cleland (1999) found that it dissipated if even a single sentence intervened between prime and target. This paper asks what causes it to be long lasting. On one account, the rapid decay evidenced by Branigan et al. occurs because the task emphasizes conceptual planning; on another account, it is due to the written nature of their task. If conceptual planning is the cause, this might relate to planning the prime sentence or planning an intervening sentence. Hence we conducted an experiment with spoken sentence completion, contrasting no delay, an intervening sentence, and a pure temporal delay. The results indicated that strong and similar priming occurred in all three cases, therefore lending support to the claim that spoken priming is long lasting.

Syntactic co-ordination in dialogue

There is substantial evidence that speakers co-ordinate their contributions in dialogue. Until now, experimental studies of co-ordination have concentrated on the development of shared strategies for reference. We present an experiment that employed a novel confederate-scripting technique to investigate whether speakers also co-ordinate syntactic structure in dialogue. Pairs of speakers took it in turns to describe pictures to each other. One speaker was a confederate of the experimenter and produced scripted descriptions that systematically varied in syntactic structure. The syntactic structure of the confederate's description affected the syntactic structure of the other speaker's subsequent description. We suggest that these effects are instances of syntactic priming (Bock, 1986), and provide evidence for a shared level of representation in comprehension and production. We describe how these effects might be realized in a processing model of language production, and relate them to previous findings of linguistic co-ordination in dialogue.

Activation of syntactic information during language production

In order to produce utterances, people must draw upon syntactic information. This paper considers how evidence from syntactic priming experiments casts light upon the nature of syntactic information activation during language production. We examine three issues: the way in which syntactic information is initially activated, the circumstances under which activation may persist or dissipate, and the effects of residual activation of syntactic information on subsequent language production. Evidence from dialog experiments suggests that the information that is initially activated is the same in both production and comprehension. Evidence about the persistence of activation following initial activation is more complex. We suggest that persistence may be related to the potential relevance of the information for subsequent syntactic processing. We show that current evidence is inconclusive about how long syntactic information remains activated.

Syntactic priming in written production: evidence for rapid decay

There is strong evidence for syntactic priming in language production (Bock, 1986), but little evidence about the time course of such effects. We report an experiment that examined the circumstances under which syntactic priming decays in written language production. Participants completed sentence fragments that allowed completions with one of two syntactic forms (Pickering & Branigan, 1998). They tended to produce the same syntactic form for immediately consecutive fragments, even though the two fragments described different events. However, when the experimental fragments were separated by other fragments with unrelated syntactic forms, this tendency rapidly diminished. The results suggest that priming effects in written production decay rapidly when other structures are subsequently produced. We discuss the implications for the application of syntactic information during production.