Cues to Contrastive Focus in Romanian

In this study we measured patterns of pitch alignment, pitch range and duration in relation to broad and contrastive focus in Romanian. In declarative sentences with broad focus, speakers place a pitch accent on each lexically stressed syllable with peaks that become progressively lower towards the end of the sentence. In prenuclear accents peaks align with the post-tonic syllable. In declarative sentences with contrastive focus, speakers use strategies based on pitch and duration in order to build a maximum contrast between the word under focus and those in pre- and post-focal contexts: an expanded pitch range under focus and a reduced pitch range and shorter stressed syllables in pre- and post-focal contexts. Thus, the flat F0 and shorter segmental durations in pre- and post-focal contexts constitute a background that by contrast, highlights the segmental durations and expanded pitch ranges found under contrastive focus

Explaining Cross-Language Asymmetries in Prosodic Processing: The Cue-Driven Window Length Hypothesis

Cross-language studies have shown that English speakers use suprasegmental cues to lexical stress less consistently than speakers of Spanish and other Germanic languages ; accordingly, these studies have attributed this asymmetry to a possible trade-off between the use of vowel reduction and suprasegmental cues in lexical access. We put forward the hypothesis that this “cue trade-off” modulates intonation processing as well, so that English speakers make less use of suprasegmental cues in comparison to Spanish speakers when processing intonation in utterances causing processing asymmetries between these two languages. In three cross-language experiments comparing English and Spanish speakers’ prediction of hypo-articulated utterances in focal sentences and reporting speech, we have provided evidence for our hypothesis and proposed a mechanism, the Cue-Driven Window Length model, which accounts for the observed cross-language processing asymmetries between English and Spanish at both lexical and utterance levels. Altogether, results from these experiments illustrated in detail how different types of low-level acoustic information (e.g., vowel reduction versus duration) interacted with higher-level expectations based on the speakers’ knowledge of intonation providing support for our hypothesis. These interactions were coherent with an active model of speech perception that entailed real-time adjusting to feedback and to information from the context, challenging more traditional models that consider speech perception as a passive, bottom-up pattern-matching process

Perceptual Evidence for Direct Acoustic Correlates of Stress in Spanish

ABSTRACT We provide evidence for the perception of the stress contrast in deaccented contexts in Spanish. Twenty participants were asked to identify oxytone words which varied orthogonally in two bidimensional paroxytone-oxytone continua: one of duration and spectral tilt, and the other of duration and overall intensity. Results indicate that duration and overall intensity were cues to stress, while spectral tilt was not. Moreover, stress detection depended on vowel type: the stress contrast was perceived more consistently in [a] than in [i]. Thus, in spite of lacking vowel reduction, stress in Spanish has its own phonetic material in the absence of pitch accents. However, we cannot speak of cues to stress in general since they depend on the characteristics of the vowel

Communicative function and prosodic form in speech timing

Listeners can use variation in speech segment duration to interpret the structure of spoken utterances, but there is no systematic description of how speakers manipulate timing for communicative ends. Here I propose a functional approach to prosodic speech timing, with particular reference to English. The disparate findings regarding the production of timing effects are evaluated against the functional requirement that communicative durational variation should be perceivable and interpretable by the listener. In the resulting framework, prosodic structure is held to influence speech timing directly only at the heads and edges of prosodic domains, through large, consistent lengthening effects. As each such effect has a characteristic locus within its domain, speech timing cues are potentially disambiguated for the listener, even in the absence of other information. Diffuse timing effects – in particular, quasi-rhythmical compensatory processes implying a relationship between structure and timing throughout the utterance – are found to be weak and inconsistently observed. Furthermore, it is argued that articulatory and perceptual constraints make shortening processes less useful as structural cues, and they must be regarded as peripheral, at best, in a parsimonious and functionally-informed account

Emergent Complexity in Speech Acquisition : Applications to Evolution of the Speech Capacity(International & Interdisciplinary Symposium on What is Evolution? Bicentennial of Charles Darwin's Birth)

この論文は国立情報学研究所の電子図書館事業により電子化されました

Creating a cross-linguistic database to investigate speech rhythm

Rhythm, which refers to the sensation of isochrony conveyed by repeating patterns in speech, is key to add emotion and pragmatic meanings to the dialogues of, for example, voice assistants such as Siri and Alexa. Despite its importance, few papers tested new promising rhythm measures due to the technical challenges involved in this research. The present project aims at ameliorating these challenges by creating a database to study prosody cross-linguistically together with a set of scripts that output over 20 rhythm measures. With the help of undergraduate students majoring in different languages, the database will consist of TED talks in 8 languages, their orthographic transcriptions, and annotated speech wave forms (words, syllables, phonemes, and pauses). Speech annotations will be automatically generated by freely available aligners and sound editing programs. This database will be the input to the scripts that output the 20+ rhythm measures. Both tools, the database and scripts, together with a manual will be made available to the research community worldwide in order to promote international dialogue in this field

A Description of Tucumán Spanish Intonation in Argentina

This paper documents for the first time the intonation system of Tucumán Spanish, an understudied variety of Argentinian Spanish. Semi-spontaneous speech illustrating the intonation of main sentence types, i.e. broad focus statements, partial and absolute interrogatives, and imperatives and vocatives, was elicited from 31 native speakers of Tucumán Spanish via an adapted version of the Argentinian Intonation Survey (Prieto and Roseano, 2009-2013). The two authors listened to the recordings and transcribed them using the Tones and Break Indexes conventions (ToBI) (Beckman et al. 2002, Prieto and Roseano 2010, Hualde and Prieto 2015). Transcriptions of prenuclear and nuclear configurations together with their respective frequencies allowed both an appreciation of the most used configurations within each sentence type along with detailed variation at the phonetic level. For example, yes/no questions were consistently realized with a low nuclear pitch accent L* and an ascending boundary tone. However, there was variation in the height of the boundary tones yielding the frequent contour L* ¡H%, and the less frequent L* H%. Altogether, these detailed patterns document the systematic phonetic variation of the intonation system of TS and provide a basis for future research to determine the phonological status of this variation

GPCR photopharmacology

International audienceNew technologies for spatial and temporal remote control of G protein-coupled receptors (GPCRs) are necessary to unravel the complexity of GPCR signalling in cells, tissues and living organisms. An effective approach, recently developed, consists on the design of light-operated ligands whereby light-dependent GPCR activity regulation can be achieved. In this context, the use of light provides an advantage as it combines safety, easy delivery, high resolution and it does not interfere with most cellular processes. In this review we summarize the most relevant successful achievements in GPCR photopharmacology. These recent findings constitute a significant advance in research studies on the molecular dynamics of receptor activation and their physiological roles in vivo. Moreover, these molecules hold potential toward clinical uses as light-operated drugs, which can overcome some of the problems of conventional pharmacology