Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"head motion"”.
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HEAD MOTION EVALUATION AND CORRECTION IN MAGNETOENCEPHALOGRAPHY
Head motions during magnetoencephalography (MEG) data acquisition lead to inaccuracy in MEG signal localization and statistical sensitivity. Multiple head motion correction methods have been developed and validated to insure the head motion effects are removed, with the aim of improving …
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Effects of Head Motion on Postural Stability in Participants with Chronic Motion Sensitivity
<p>Background: Motion sensitivity, or motion sickness, is common among individuals in modern vehicular and visually stimulating environments; notably, people with normal vestibular function are susceptible to this condition. Motion-provoked dizziness often causes postural instability. Purposes: …
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Relationship between astronaut head motion and space motion sickness on Spacelabs 1 and D1
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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PROSPECTIVE HEAD MOVEMENT CORRECTION FOR HIGH-RESOLUTION MRI USING AN IN-BORE OPTICAL TRACKING SYSTEM
In MRI of the human brain, subject motion is a major cause of magnetic resonance image quality degradation. To compensate the effects of head motion during data acquisition, an in-bore optical motion tracking system is proposed. The system comprises one or two MR compatible infrared cameras that …
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MECHANISMS OF GAZE STABILITY DURING WALKING: BEHAVIORAL AND PHYSIOLOGICAL MEASURES RELATING GAZE STABILITY TO OSCILLOPSIA
… walking. Visual input contributes to control of head, trunk, and leg motion during walking to facilitate interaction with and avoidance of objects and individuals in the environment. The vestibular system contributes to postural control during walking and also to stabilization of the eyes during …
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Test-retest Reliability of Intrinsic Human Brain Default-Mode fMRI Connectivity: Slice Acquisition and Physiological Noise Correction Effects
… studies, strategies for physiological noise and head motion correction in resting state brain FC-fMRI. In particular, as a general marker of noise correction performance we use the test-retest reproducibility of the DMN. The guiding hypothesis is that methods that improve reproducibility should …
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Cross plane transfer of vestibular adaptation to human centrifugation
… of unusual vestibular stimuli when certain head movements are made. Since these movements can elicit inappropriate nystagmus, illusions of tumbling, and motion sickness, efforts have been made to adapt people to the stimuli. So far these efforts have been successful in showing that people …
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Say cheese! Brain imaging of texture perception
… implemented for fMRI; while for fNIRS, multiple motion-correction techniques were implemented and assessed on their ability to reduce masticatory-related noise. Multi-echo fMRI revealed neural selectivity to food texture within the right oral somatosensory and left orbitofrontal cortex using …
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Contribution of Modified Visual Gain to Human Balance Control During Quiet, Upright Stance
… Optic flow was amplified or reduced relative to head motion while participants stood quietly on either a firm or foam surface. Overall, when there was an increased reliance placed on the visual system by standing on foam, a tighter regulation of upright stance was observed as optic flow gain …
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X-Conference : reinventing a teleconferencing system
… view and the virtual view. An individualized 3-D head object is built semi-automatically by mapping the real texture to the globally modified generic model. Head motion parameters are extracted from tracking artificial and/or facial features. Without using the articulation model, facial animation …
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Construction and control of motion compensation system
… This project concerns the construction of a motion compensation device to augment the video capabilities of casual hardware. It combines facial recognition and tracking, control algorithms, and linear actuation to enable a screen or other object to adapt real-time to the user's head motion. …
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Improved accuracy in susceptibility-based OEF measurements by mitigation of partial-volume effects via combined magnitude and phase reconstruction
… high-quality fetal brain imaging is hampered by motion of the fetus, which can severely degrade image quality. Previously, low-resolution volumetric navigator (vNav) acquisitions have been shown to accurately track motion in human adults and prospectively correct for it. Here, a technique for …
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Helmet-mounted display symbology for ground collision avoidance in fighter aircraft
… of visual alert symbology was tested using a head-fixed iconic alerting cue. Formats for additional recovery information were tested using an aircraft-fixed guidance cue, a head-fixed guidance cue, and a head-fixed guidance cue with a pitch ladder. Subjects were given audio and visual side …
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The Development of a Head and Neck Support Device for Children with Cerebral Palsy
… If a person with cerebral palsy can keep their head upright, there are many benefits that include reduced muscle tone, better upper-extremity functioning, increased comfort, and improved functioning in society. The purpose of this research was to develop a head and neck support device for …
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To Run or to Carry: Derived Traits in Early Members of the Genus Homo
… skeletal morphology especially related to locomotion. Therefore, this dissertation seeks to explore loaded walking behaviors in humans in relation to running to determine if there is overlap in locomotor challenges between these two activities. To accomplish this goal, three studies were …
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Headtrack: Tracking head orientation using wireless signals
Estimating and tracking the head orientation of the user is an important problem for numerous mobile computing applications. Current solutions to the problem require deploying infrastructure (namely, cameras and lasers) along with expensive (IMU) sensors. These infrastructure-based approaches bound …
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Eye Tracking Using Fiber Optics and Computer Vision Techniques
We describe a system for tracking the motion and determining the velocity of the human eye using a combination of fiber optics and imaging optics integrated with a CCD camera, a framegrabber, and a PC. Systems such as the one we describe are needed for monitoring location of interest for better …
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Human Perception of Transient Longitudinal Vehicle Motion
… of discomfort during transient longitudinal motion of a vehicle is little understood. Optimizing vehicle motion to maximize occupant comfort is of great interest to vehicle manufacturers. The imminent wide-scale deployment of autonomous control has further increased the attention on the ride …
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Computational Study of Multisensory Gaze-Shift Planning
… the gaze-shift, 3) to work out a coordinated eye-head motion to execute the gaze-shift. There have been a large number of experimental investigations to inquire the nature of multisensory and oculomotor information processing in any of these three levels separately. Here in this thesis, we …
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