An investigation of the dependency of subject-verb agreement on inhibitory control processes in sentence production

Agreement attraction, i.e., the production or acceptance of a verb that agrees with a noun other than the subject of the sentence, can be viewed as a process in which conflicting cues activate competing representations. The aftermath of such competition, in terms of cognitive processes, remains unclear. Using a novel referential communication task for eliciting agreement errors and both group-level manipulation of control demands and a detailed analysis of individual differences, we provide converging evidence for the role of monitoring and inhibitory control processes in agreement attraction for singular-subject sentences. We further demonstrate the dependence of producing plural verbs on such processes, suggesting the singular form is the prepotent default form. Collectively, these findings provide a clear demonstration for the role of monitoring and control processes in agreement computations, and more generally syntactic operations in sentence production.

Formation Control of a Multi-Autonomous Underwater Vehicle Event-Triggered Mechanism Based on the Hungarian Algorithm

Among the key technologies of Autonomous Underwater Vehicle (AUV) leader–follower formations control, formation reconfiguration technology is one of the main technologies to ensure that multiple AUVs successfully complete their tasks in a complex operating environment. The biggest drawback of the leader–follower formations technology is the failure of the leader and the excessive communication pressure of the leader. Aiming at the problem of leader failure in multi- AUV leader–follower formations, the Hungarian algorithm is used to reconstruct the failed formation with a minimum cost, and the improvement of the Hungarian algorithm can solve the problem of a non-standard assignment. In order to solve the problem of an increased leader communication task after formation reconfiguration, the application of an event-triggered mechanism (ETM) can reduce unnecessary and useless communication, while the efficiency of the ETM can be improved through increasing the event-triggered conditions of the sampling error threshold. The simulation results of multi-AUV formation control show that the Hungarian algorithm proposed in this paper can deal with the leader failure in the multi-AUV leader–follower formation, and the ETM designed in this paper can reduce about 90% of the communication traffic of the formation which also proves the highly efficient performance of the improved ETM in the paper.

ASL Production

Previous research has pointed at naturalness and communicative efficiency as possible constraints on language structure. Here, we investigated adjective position in American Sign Language (ASL), a language with relatively flexible word order, to test the incremental efficiency hypothesis, according to which both speakers and signers try to produce efficient referential expressions that are sensitive to the word order of their languages. The results of three experiments using a standard referential communication task confirmed that deaf ASL signers tend to produce absolute adjectives, such as color or material, in prenominal position, while scalar adjectives tend to be produced in prenominal position when expressed as lexical signs, but in postnominal position when expressed as classifiers. Age of ASL exposure also had an effect on referential choice, with early-exposed signers producing more classifiers than late-exposed signers. Overall, our results suggest that linguistic, pragmatic and developmental factors affect referential choice in ASL, supporting the hypothesis that communicative efficiency is an important factor in shaping language structure.

Socio-cognitive engagement (but not socioeconomic status) predicts preschool children's language and pragmatic abilities

Parental socioeconomic status (SES) strongly influences children's language abilities but less is known about its influence on pragmatic abilities (e.g., inferring intentions from relevance implicatures). Moreover, by focussing on SES, the role of socio-cognitive engagement (e.g., joint parent-child interactions) has been overlooked. We tested four- and six-year-old children (n = 92) with a communication task, a questionnaire assessed parents’ SES and socio-cognitive engagement. Socio-cognitive engagement predicted children's communication abilities while the parental educational background and income did not. This emphasizes the notion that communication is a highly socio-cognitive task, one which children perform the better the more frequently they engage in socio-cognitive interactions.

Reciprocity in Instant Messaging Conversations

We tested how the introduction and removal of well-defined roles influenced contribution behaviors in instant messaging conversations. Pairs of participants worked on a referential communication task where one participant (the director) had more information than the other (the matcher). Next, these roles were removed and the participants were allowed to communicate freely. Participants then switched director/matcher roles and the procedure was repeated. On average participants in the director role wrote more than participants in the matcher role during the task. But instead of a balanced conversation during unstructured chat, which might have happened without a task preceding it, during off-task conversation former-matchers, on average, contributed more than former-directors. Results support the hypothesis that speech complementarity leads to efforts to redress imbalance, a process we call reciprocity.

Face-to-Face Communication in Aphasia: The Influence of Conversation Partner Familiarity on a Collaborative Communication Task

Aphasia is language impairment due to acquired brain damage. It affects people’s ability to communicate effectively in everyday life. Little is known about the influence of environmental factors on everyday communication for people with aphasia (PWA). It is generally assumed that for PWA speaking to a familiar person (i.e. with shared experiences and knowledge) is easier than speaking to a stranger (Howard, Swinburn, and Porter). This assumption is in line with existing psycholinguistic theories of common ground (Clark, 1996), but there is little empirical data to support this assumption. The current study investigated whether PWA benefit from conversation partner (CP) familiarity during goal-directed communication, and how this effect compared to a group of neurologically healthy controls (NHC). Sixteen PWA with mild to severe aphasia, sixteen matched NHC, plus self-selected familiar CPs participated. Pairs were videotaped while completing a collaborative communication task. Pairs faced identical Playmobile rooms: the view of the other’s room was blocked. Listeners attempted to replicate the 5-item set-up in the instructor’s room. Roles were swapped for each trial. For the unfamiliar condition, participants were paired with another participant’s CP (PWA were matched with another PWA’s CP based on their aphasia profile). The outcomes were canonical measures of communicative efficiency (i.e. accuracy, time to complete, etc.). Results showed different effects in response to the unfamiliar partner for PWA compared to NHC: In the instructor role, PWA showed faster trial times with the unfamiliar partner, but similar accuracy scores in both conditions. NHC, on the other hand, showed similar trial times across CPs, but higher accuracy scores with the unfamiliar partner. In the listener role, PWA showed a pattern more similar to NHC: equal trial times across conditions, and an improvement in accuracy scores with the unfamiliar partner. Results show that conversation partner familiarity significantly affected communication for PWA dyads on a familiar task, but not for NHC. This research highlights the importance of identifying factors that influence communication for PWA and understanding how this effect varies across aphasia profiles. This knowledge will ultimately inform our assessment and intervention of real-world communication.

Identifying research gaps: A review of virtual patient education and self-management

BACKGROUND: Avatars in Virtual Reality (VR) can not only represent humans, but also embody intelligent software agents that communicate with humans, thus enabling a new paradigm of human-machine interaction. OBJECTIVE: The research agenda proposed in this paper by an interdisciplinary team is motivated by the premise that a conversation with a smart agent avatar in VR means more than giving a face and body to a chatbot. Using the concrete communication task of patient education, this research agenda is rather intended to explore which patterns and practices must be constructed visually, verbally, para- and nonverbally between humans and embodied machines in a counselling context so that humans can integrate counselling by an embodied VR smart agent into their thinking and acting in one way or another. METHODS: The scientific literature in different bibliographical databases was reviewed. A qualitative narrative approach was applied for analysis. RESULTS: A research agenda is proposed which investigates how recurring consultations of patients with healthcare professionals are currently conducted and how they could be conducted with an embodied smart agent in immersive VR. CONCLUSIONS: Interdisciplinary teams consisting of linguists, computer scientists, visual designers and health care professionals are required which need to go beyond a technology-centric solution design approach. Linguists’ insights from discourse analysis drive the explorative experiments to identify test and discover what capabilities and attributes the smart agent in VR must have, in order to communicate effectively with a human being.

Grounding behaviours with conversational interfaces: effects of embodiment and failures

Conversational interfaces that interact with humans need to continuously establish, maintain and repair common ground in task-oriented dialogues. Uncertainty, repairs and acknowledgements are expressed in user behaviour in the continuous efforts of the conversational partners to maintain mutual understanding. Users change their behaviour when interacting with systems in different forms of embodiment, which affects the abilities of these interfaces to observe users’ recurrent social signals. Additionally, humans are intellectually biased towards social activity when facing anthropomorphic agents or when presented with subtle social cues. Two studies are presented in this paper examining how humans interact in a referential communication task with wizarded interfaces in different forms of embodiment. In study 1 (N = 30), we test whether humans respond the same way to agents, in different forms of embodiment and social behaviour. In study 2 (N = 44), we replicate the same task and agents but introduce conversational failures disrupting the process of grounding. Findings indicate that it is not always favourable for agents to be anthropomorphised or to communicate with non-verbal cues, as human grounding behaviours change when embodiment and failures are manipulated.