The impact of shared knowledge on speakers’ prosody

International audienceHow does the knowledge shared by interlocutors during interaction modify the way speakers speak? Specifically, how does prosody change when speakers know that their addressees do not share the same knowledge as them? We studied these effects in an interactive paradigm in which French speakers gave instructions to addressees about where to place a cross between different objects (e.g., You put the cross between the red mouse and the red house). We manipulated (i) whether the two interlocutors shared or did not necessarily share the same objects and (ii) the informational status of referents. We were interested in two types of prosodic variations: global prosodic variations that affect entire utterances (i.e., pitch range and speech rate variations) and more local prosodic variations that encode infor-mational status of referents (i.e., prosodic phrasing for French). We found that participants spoke more slowly and with larger pitch excursions in the not-shared knowledge condition than in the shared knowledge condition while they did not prosodically encode the informa-tional status of referents regardless of the knowledge condition. Results demonstrated that speakers kept track of what the addressee knew, and that they adapted their global prosody to their interlocutors. This made the task too cognitively demanding to allow the prosodic encoding of the informational status of referents. Our findings are in line with the idea that complex reasoning usually implicated in constructing a model of the addressee co-exists with speaker-internal constraints such as cognitive load to affect speaker's prosody during interaction

Perceptual evaluation of tonal and contextual cues to sarcasm in French

International audienceVerbal irony is a mode of expression in which what is stated differs from (or is even opposed to) what is meant. Irony exists in the majority of the languages and cultures of the world (Pexman, 2008). Some researchers have proposed that acoustic irony cues are only employed if the common ground is not sufficient to indicate the intended message (Cutler, 1974). More recent research has shown that ironic content can be identified even in absence of contextual cues thanks to global acoustic/prosodic cues (Bryant & Fox Tree 2002). However, we still do not know what is the actual role of prosody, in particular of intonational phonology features (Ladd, 1996/2008), in irony comprehension. Concerning actual acoustic cues, sarcasm appears to be encoded in speech through various global manipulations in acoustic parameters such as fundamental frequency (f0), amplitude, speech rate, voice quality and vowel hyperarticulation (Attardo et al., 2003; Bryant & Fox Tree, 2005; Cheang & Pell, 2008; Rockwell, 2000; Sharrer & Christman, 2011; inter alia). In this study, we explore the expression of sarcasm in French, for which phonological data are still lacking. Specifically, here we test the acceptability of prototypical sarcastic tonal contours in presence of matching or conflicting contextual cues

Prosodic cues of sarcastic speech in French: slower, higher, wider

International audienceVerbal irony is characterized by the use of specific acoustic modulations, especially global prosodic cues as well as vowel hyperarticulation. Little is known concerning the expression of sarcastic speech in French. Here we report on global prosodic features of sarcastic speech in a corpus of declarative French utterances. Our data show that sarcastic productions are characterized by utterance lengthening, by increased f0 modulations and a global raising of the pitch level and range. The results are discussed in the light of results on the acoustic features of ironic speech in languages other than French

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

Evaluation of delexicalization methods for research on emotional speech

Perceptual evaluation of non-controlled emotional speech requires delexicalization to neutralize semantic variation. However, most existing methods imply losing spectral cues crucial to emotional attribution, related to both laryngeal and supralaryngeal settings. We propose a method relying on voice morphing to retain part of the spectral information of the original stimuli, as an additional step to diphone synthesis delexicalization. After previous assessment of intelligibility loss, this study evaluates the naturalness of angry and neutral expressions in French films, delexicalized using low-pass filtering and the proposed method implemented with MBROLA and STRAIGHT. Results show that morphing-based delexicalization, which leads to accurate emotional attribution, is rated with a higher degree of naturalness than low-pass filtering. Implications for research in affective speech are discussed with regards to other delexicalization methods proposed in the literature

Comprehending non-literal language: effects of aging and bilingualism

A pressing issue that the 21st century is facing in many parts of the developed world is a rapidly aging population. Whilst several studies have looked at aging older adults and their language use in terms of vocabulary, syntax and sentence comprehension, few have focused on the comprehension of non-literal language (i.e. pragmatic inference-making) by aging older adults, and even fewer, if any, have explored the effects of bilingualism on pragmatic inferences of non-literal language by aging older bilinguals. Thus, the present study examined the effects of age(ing) and the effects of bilingualism on aging older adults’ ability to infer non-literal meaning. Four groups of participants made up of monolingual English-speaking and bilingual English-Tamil speaking young (17–23 years) and older (60– 83 years) adults were tested with pragmatic tasks that included non-conventional indirect requests, conversational implicatures, conventional metaphors and novel metaphors for both accuracy and efficiency in terms of response times. While the study did not find any significant difference between monolinguals and bilinguals on pragmatic inferences, there was a significant effect of age on one type of non-literal language tested: conventional metaphors. The effect of age was present only for the monolinguals with aging older monolinguals performing less well than the young monolinguals. Aging older bilingual adults were not affected by age whilst processing conventional metaphors. This suggests a bilingual advantage in pragmatic inferences of conventional metaphors

Determinants of Theory of Mind performance in Alzheimer’s disease: A data-mining study

Whether theory of mind (ToM) is preserved in Alzheimer’s disease (AD) remains a controversial subject. Recent studies have showed that performance on some ToM tests might be altered in AD, though to a lesser extent than in behavioural-variant Frontotemporal Dementia (bvFTD). It is however, unclear if this reflects a genuine impairment of ToM or a deficit secondary to the general cognitive decline observed in AD. Aiming to investigate the cognitive determinants of ToM performance in AD, a data-mining study was conducted in 29 AD patients then replicated in an independent age-matched group of 19 AD patients to perform an independent replication of the results. 44 bvFTD patients were included as a comparison group. All patients had an extensive neuropsychological examination. Hierarchical clustering analyses showed that ToM performance clustered with measures of executive functioning in AD. ToM performance was also specifically correlated with the executive component extracted from a principal component analysis. In a final step, automated linear modelling conducted to determine the predictors of ToM performance showed that 48.8% of ToM performance was significantly predicted by executive measures. Similar findings across analyses were observed in the independent group of AD patients, thereby replicating our results. Conversely, ToM impairments in bvFTD appeared independent of other cognitive impairments. These results suggest that difficulties of AD patients on ToM tests do not reflect a genuine ToM deficit, rather mediated by general (and particularly executive) cognitive decline. They also suggest that executive functioning has a key role in mental state attribution, which support interacting models of ToM functioning. Finally, our study highlights the relevancy of data-mining statistical approaches in clinical and cognitive neurosciences

Que nous révèle le langage sur la représentation du monde et des autres dans la shcizophrénie?

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Théorie de l'esprit et fonctions exécutives dans la pathologie

International audienceL'objectif de cette présentation est de caractériser les déficits d'attribution d'états mentaux dans la schizophrénie et chez les individus avec troubles légers de la cognition