Self-motion perception and vestibulo-ocular reflex during whole body yaw rotation in standing subjects: the role of head position and neck proprioception.
ABSTRACT Self-motion perception and vestibulo-ocular reflex (VOR) were studied during whole body yaw rotation in the dark at different static head positions. Rotations consisted of four cycles of symmetric sinusoidal and asymmetric oscillations. Self-motion perception was evaluated by measuring the ability of subjects to manually track a static remembered target. VOR was recorded separately and the slow phase eye position (SPEP) was computed. Three different head static yaw deviations (active and passive) relative to the trunk (0°, 45° to right and 45° to left) were examined. Active head deviations had a significant effect during asymmetric oscillation: the movement perception was enhanced when the head was kept turned toward the side of body rotation and decreased in the opposite direction. Conversely, passive head deviations had no effect on movement perception. Further, vibration (100 Hz) of the neck muscles splenius capitis and sternocleidomastoideus remarkably influenced perceived rotation during asymmetric oscillation. On the other hand, SPEP of VOR was modulated by active head deviation, but was not influenced by neck muscle vibration. Through its effects on motion perception and reflex gain, head position improved gaze stability and enhanced self-motion perception in the direction of the head deviation.
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ABSTRACT: Women who are single parents, poor, and employed in low-paying jobs have little choice about being dependent on public assistance programs to meet basic personal and family needs. To explore women's perceptions of their health and well-being while enrolled in a work-based welfare program. This is the second in a series of articles about Temporary Assistance for Needy Families. Qualitative interviews and quantitative survey methods were used to explore perceptions of health and well-being in a purposive sample of mothers (n = 34) enrolled in a work-based welfare program in a city in the U.S. Midwest. Instruments used were a semistructured interview guide, a demographic data form, and the General Well-Being Schedule (i.e., a survey tool developed for the U.S. Health and Nutrition Examination Survey). Data collection was completed in June 2000. The data were triangulated; using both quantitative and qualitative data added to the in-depth understanding of the subjects. Distress levels reported by participants were significantly higher than in the general U.S. population. Results of this study suggest that current policies do not effectively support health and well-being of single mothers enrolled in work-based welfare programs.Public Health Nursing 01/2005; 22(6):506-14. · 0.78 Impact Factor
Article: Noise in industry.The Medical journal of Australia 06/1959; 1(21):694-6. · 2.85 Impact Factor
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ABSTRACT: A set of propositions is offered to provide a frame of reference for proposed strategies to improve healthful behavior by placing personal choice-making in the context of societal option-setting. The health status of populations at a given point in time is seen as a result of customary personal choice-making. These choices in turn are limited by both the perceived and actual options available to individuals, depending on their personal and their community's resources, from which to make choices. Most people, most of the time will make the easiest choices, i.e., will do the things, develop the patterns or life-styles, which seem to cost them less and/or from which they will gain more of what they value in tangible and/or intangible terms.American Journal of Public Health 06/1976; 66(5):435-9. · 3.93 Impact Factor