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            "title": "Symbolic phonetic features for modeling of pronunciation variation",
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                    "creatorType": "author",
                    "firstName": "Rebecca A.",
                    "lastName": "Bates"
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            "abstractNote": "A significant source of variation in spontaneous speech is due to intra-speaker pronunciation changes, often realized as small feature changes, e.g., nasalized vowels or affricated stops, rather than full phone transformations. Previous computational modeling of pronunciation variation has typically involved transformations from one phone to another, in part because most speech processing systems use phone-based units. Here, a phonetic-feature-based prediction model is presented where phones are represented by a vector of symbolic features that can be on, off, unspecified or unused. Feature interaction is examined using different groupings of possibly dependent features, and a hierarchical grouping with conditional dependencies led to the best results. Feature-based models are shown to be more efficient than phone-based models, in the sense of requiring fewer parameters to predict variation while giving smaller distance and perplexity values when comparing predictions to the hand-labeled reference. A parsimonious model is better suited to incorporating new conditioning factors, and this work investigates high-level information sources, including both text (syntax, discourse) and prosody cues. Experiments show that feature-based models benefit from prosody cues, but not text, and that phone-based models do not benefit from any of the high-level cues explored here.",
            "publicationTitle": "Speech Communication",
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            "date": "February 1, 2007",
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            "abstractNote": "In recent years there has been a substantial debate about the need for increasingly spontaneous, conversational corpora of spoken interaction that are not controlled or task directed. In parallel the need has arisen for the recording of multi-modal corpora which are not restricted to the audio domain alone. With a corpus that would fulfill both needs, it would be possible to investigate the natural coupling, not only in turn-taking and voice, but also in the movement of participants. In the following paper we describe the design and recording of such a corpus and we provide some illustrative examples of how such a corpus might be exploited in the study of dynamic interaction. The D64 corpus is a multimodal corpus recorded over two successive days. Each day resulted in approximately 4 h of recordings. In total five participants took part in the recordings of whom two participants were female and three were male. Seven video cameras were used of which at least one was trained on each participant. The Optitrack motion capture kit was used in order to enrich information. The D64 corpus comprises annotations on conversational involvement, speech activity and pauses as well as information of the average degree of change in the movement of participants.",
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                    "firstName": "Audrey",
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            "abstractNote": "The pronunciation of words is highly variable. This variation provides crucial information about the cognitive architecture of the language production system. This review summarizes key empirical findings about variation phenomena, integrating corpus, acoustic, articulatory, and chronometric data from phonetic and psycholinguistic studies. It examines how these data constrain our current understanding of word production processes and highlights major challenges and open issues that should be addressed in future research.",
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            "title": "Eliciting Speech Reduction in the Laboratory: Assessment of a New Experimental Method 1",
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            "abstractNote": "Abstract. The aim of this study was the development and assessment of a novel method for recording speech produced under varying degrees of articulatory precision in the laboratory. Three conditions were designed to elicit reduced, citation, and careful speaking styles. In the first condition, talkers read sentences while simultaneously carrying out a distractor task. In the second condition, talkers simply read the same set of sentences in the absence of any other task. In the third condition, talkers read the sentences but were frequently prompted by the computer to re-read the last sentence more carefully. Recordings from six talkers, three female and three male, were made and measurements were carried out along a number of dimensions that have been used in the literature to distinguish careful from reduced speech or that have been linked to differences in intelligibility between talkers. Using acoustic analysis, measures of word duration, sentence duration, overall sentence energy, word energy, sentence energy range, word energy range, pitch range of the sentence, and two measures of F1-F2 vowel space dispersion were obtained for all six talkers. Overall, we observed consistent effects of speaking mode across most talkers for many of the measured dimensions. Individually, there was variability between talkers as to which dimensions showed the greatest differences between conditions. The overall pattern of results indicates that these experimental procedures can be used to elicit varying degrees of articulatory control in a highly controlled laboratory environment.",
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            "date": "1998",
            "seriesTitle": "Research on Spoken Language Processing Progress Report",
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            "url": "/paper/Eliciting-Speech-Reduction-in-the-Laboratory%3A-of-a-Brink-Wright/7e579490a9abab368d0d625a60a343d3e23f886b",
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            "title": "Eliciting Speech Reduction in the Laboratory II : Calibrating the Cognitive Load for Individual Talkers",
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            "abstractNote": "This experiment extended work done previously in our laboratory to develop a method to elicit from talkers three different speaking styles, reduced, citation, and hyperarticulated, using controlled materials in a laboratory setting. In the initial experiment, the reduced style was elicited by having subjects read a sentence while carrying out a distractor task that involved recalling a fixed number of digits from shortterm memory. The original experiment was clearly limited in its success at eliciting a reduced style of speech: Only one of the six talkers showed significant differences between reduced and citation speech based on an acoustic analysis of the sentences. In this study, we chose to calibrate the distractor memory task to an individual&#39;s short-term memory span as measured by a simple digit span task. That is, the number of digits to be recalled after reading aloud a test sentence was determined by each individual&#39;s digit span. Twelve talkers were recorded in this experiment. The results showed that six of the twelve talkers produced a reduced style of speech for the test sentences in the distractor task relative to the same sentences in the citation style condition, as determined by a phonetically-trained judge. This initial evaluation was confirmed in a perceptual test using a pairwise comparison task in which normal-hearing, untrained listeners were presented with two sentences varying in speech style and were asked to choose the most carefully pronounced sentence. The results showed that 71% 88% of the sentence sets tested were correctly differentiated by speech style, indicating that the individual calibration method was a substantial improvement over the elicitation method of the original experiment.",
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            "title": "A new method for eliciting three speaking styles in the laboratory",
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                    "firstName": "James D.",
                    "lastName": "Harnsberger"
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            "abstractNote": "In this study, a method was developed to elicit three different speaking styles, reduced, citation, and hyperarticulated, using controlled sentence materials in a laboratory setting. In the first set of experiments, the reduced style was elicited by having twelve talkers read a sentence while carrying out a distractor task that involved recalling from short-term memory an individually-calibrated number of digits. The citation style corresponded to read speech in the laboratory. The hyperarticulated style was elicited by prompting talkers (twice) to reread the sentences more carefully. The results of perceptual tests with naïve listeners and an acoustic analysis showed that six of the twelve talkers produced a reduced style of speech for the test sentences in the distractor task relative to the same sentences in the citation style condition. In addition, all talkers consistently produced sentences in the citation and hyperarticulated styles. In the second set of experiments, the reduced style was elicited by increasing the number of digits in the distractor task by one (a heavier cognitive load). The procedures for eliciting citation and hyperarticulated sentences remained unchanged. Ten talkers were recorded in the second experiment. The results showed that six out of ten talkers differentiated all three styles as predicted (70% of all sentences recorded). In addition, all talkers consistently produced sentences in the citation and hyperarticulated styles. Overall, the results demonstrate that it is possible to elicit controlled sentence stimulus materials varying in speaking style in a laboratory setting, although the method requires further refinement to elicit these styles more consistently from individual participants.",
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            "title": "Efficiency As An Organizing Principle Of Natural Speech",
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            "title": "An acoustic description of consonant reduction",
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