published_or_final_version / Speech and Hearing Sciences / Master / Master of Philosophy

An investigation was conducted to determine if laryngeal valving economy, as reflected in measures of laryngeal airway resistance during vowel production, varies across adulthood. Toward this end, sixty healthy men were studied, ten from each of six age groups--25, 35, 45, 55, 65, and 75 years (± 2 years). Results showed that there are age-related differences in laryngeal airway resistance during vowel production, and that these differences are characterized by a lower mean resistance in 75-year-old men than in younger men of the ages studied. This finding provides insight into mechanisms regarding the impact of age on laryngeal function and has important clinical implications for the evaluation and management of men with voice disorders.

Thesis. 1975. Ph.D. cn--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. Vita. / Bibliography: leaves 293-303. / Ph.D.cn

The purpose of the investigation was to compare mean voice onset time in young and old male subjects, as well as to examine variability of VOT productions with age for prevocalic bilabial, alveolar, and velar voiced and voiceless stop consonants. Forty-five Caucasion.males were divided equally into three.age groups. Ten tokens of six stimulus words were recorded and wide band spectrograms were made. Results of an analysis of variance revealed no significant differences in VOT with age when averages of the phonemes were used for analysis; however, a significant interaction between age and voiced phonemes was found when individual trials of phoneme productions were used for analysis.

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Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. / Microfiche copy available in Archives and Engineering. / Bibliography: leaves 322-332. / Ph.D.

This study examined the roles of type of voice and locus of control on satisfaction with type of voice and on feelings of procedural justice. Two forms of voice were assessed, instrumental and non-instrumental, as well as two forms of locus of control, external and internal. Participants read a scenario that randomly placed them into type of voice. Participants responded to surveys to determine the persons' locus of control, satisfaction with voice and feelings of procedural justice. A form of participation that brings employees satisfaction is voice. Allowing employees to express their opinions is seen as fair and has benefits to employees, as well as the organization. Some individuals prefer to have an impact and be more involved in the workplace, while others do not.