97 research outputs found

    A kinematic analysis of speech sound production in children and adults

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    Along with perceptual and cognitive-linguistic factors, motor mechanisms are thought to influence the development of speech and language. In the present investigation, features of movement were examined across three developmental periods, in 4-year-old and 7-year-old children and adults. The goals were as follows: (1) to determine the nature of basic features (i.e., displacement, velocity, duration) and underlying patterns of movement and the variability of these features and patterns; (2) to determine how the production of specific consonants is reflected in movement features and patterns. Lower lip movement was recorded while speakers produced words containing labial phonetic contrasts (i.e., man, pan, ban, fan, and van). Findings could be divided into two major categories. First, children and adults were observed to produce qualitatively different features and patterns of movement. Young children produce smaller and slower movements than adults. The variability of movement diminishes across developmental periods. Also, the organization of movement changes. Four-year-old children produce more submovements than 7-year-olds. These submovements are unsystematic and disorganized. Seven-year-old children, on the other hand, produce very simple close-open sequences, with few submovements added. Adults, like 4-year-old children, include submovements in their sequences, but these are systematic and linked to phonetic context. Across age groups, both individual features and overall patterns of movement contribute to phonetic differentiation. Duration, displacement, and underlying patterning of movement all are significantly influenced by word context. Therefore, although properties of movement differ dramatically across age groups, no age effects are observed in degree of phonetic specificity

    On Ethnography

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    Disrupting the media frame at Greenham Common: a new chapter in the history of mediations?

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    Drawing on Martin-Barbero's insistence on analysing the media's complex processes of social `mediation' and Scannell's insistence on grasping the phenomenal complexity of the media frame and how people interact with it, it is argued that an important, relatively neglected, dimension of the disruptive power of the Greenham Common Women's Peace Camp (1981-) has been its challenge to the terms of the media frame, the `struggle for visibility' it represents. This struggle for visibility is examined in two stages - in relation to the early years of intense media coverage and in relation to the later years of media silence. In the concluding section, connections are opened up between Greenham Common and recent, more obviously `mediated' forms of protest action
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