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 49 for “"head movements"”.
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Reticular Pathways Controlling Lateral Head Movements in the Rat
… (PRF) lesions in the rat abolish certain head movements, it was decided to further characterize the effects of PRF lesions on head movements in the rat and to begin to determine what output pathways from the PRF might mediate its role in head movement control.
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Incremental adaptation to yaw head movements during 30 RPM centrifugation
… the vestibular stimulus associated with making head movements while rotating presents a challenge. During a head movement, the semicircular canals are excited by a cross-coupled angular acceleration, resulting in tumbling sensations, perceived body tilt, non-compensatory vertical nystagmus, and …
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Horizontal and Vertical Eye and Head Movements during a Baseball Swing
… this experiment was to observe and classify the head and eye movements of experienced baseball players when they are trying to hit a baseball. More specifically, it was designed to determine if players track deep into the pitch trajectory when attempting to hit, and if they use a similar tracking …
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The role of preoculomotor brainstem neurons in coordinated eye-head movements
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Psychology, 1980.
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Head movements of children in MEG : quantification, effects on source estimation, and compensation
Head movements during MEG recordings in children may lead to inaccurate localization of brain activity. In this thesis, we examined the effects of head movements on source estimation in twenty children performing a simple auditory cognitive task. In addition, we tested the ability of a recently …
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Artificial gravity : evaluation of adaptation to head movements during short-radius centrifugation using subjective measures
… to adapt, and retain adaptation to out-of-plane head movements made during short-radius centrifugation. The hypothesis for the experiment was as follows: Repeated exposure to a series of yaw head movements made during short-radius centrifugation at 23rpm, (with the subject lying supine and the …
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Artificial gravity : adaptation of the vestibulo-ocular reflex to head movements during short-radius centrifugation
… on the order of 1 g. Unfortunately, out-of-plane head movements during centrifugation induce inappropriate vestibulo-ocular reflexes, debilitating motion sickness symptoms, and illusory tilt sensations due to conflicting visual and vestibular signals. Practical use of an intermittent short-radius …
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Regulator control of a short-radius centrifuge and subjective responses to head movements in a rotating environment
… unexpected and illusory body motions when making head turns. My work in artificial gravity consisted of two parts, a study that investigated the vestibular response to head movements during centrifugation and regulator feedback control of the centrifuge. This experiment studied the perceived …
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Auditory Displays and Assistive Technologies: the use of head movements by visually impaired individuals and their implementation in binaural interfaces
… auditory virtual reality. It is known that head movements in the presence of sound elicit changes in the acoustical signals which arrive at each ear, and these changes can improve common auditory localisation problems in headphone-based auditory virtual reality, such as front-to-back …
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The effects of aging and unilateral vestibular disorders on the kinematic performance of vestibular rehabilitation exercises and physical function
… Older adults had difficulties stabilizing their heads relative to the environment during eye exercises and moved their heads more when the exercise required head stabilization relative to the body, probably due to alterations in performance of the exercises. Patients, who were also older adults, …
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Horizontal plane head and trunk motion during locomotion
Head stability is essential for maintaining gaze and postural orientation of the body. This study examined head and trunk movements in the horizontal plane during four walking tasks. Ten subjects performed the following tasks: normal walking (normal), walking with arm swings at twice the normal …
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Incremental vestibulo-ocular reflex (VOR) adaptation In subjects with peripheral vestibular hypofunction
… during rapid (i.e. high-frequency content) head movements. When the peripheral vestibular system is impaired, i.e. vestibular hypofunction, through disease, trauma or the aging process, the VOR response is reduced resulting in retinal image slip. Subsequently, along with other vestibular …
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Neural basis of a visuo-motor transformation in the fly
… fly, Neck Motor Neurons control gaze-stabilising head movements that occur during wholebody rotations. These motor neurons receive several sensory inputs including one from well-characterized visual interneurons, Tangential Cells (TCs), which respond to panoramic image shifts induced during …
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The design, analysis and evaluation of a humanoid robotic head
… and evaluation of a biomimetic humanoid robotic head. It is biomimetic in terms of physical design - which is based around a simulated cervical spine, and actuation, which is achieved using pneumatic air muscles (PAMS). The primary purpose of the research, however, and the main original …
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Breeding behavior of captive emperor penguins (Aptenodytes forsteri)
… important in pair bond maintenance. Three head movements studied shared several functions including comfort behavior and reduction of intraspecific aggression. My observations confirmed that the display walk occurs in Emperors and is used by males to attract females. The single note cry …
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Aspects of morphology and syntax of negation in Greek sign language
… Non-manual features comprise of negation head movements and facial expressions. As in many other signed and spoken languages, the most common way to construct a negative clause is by using a negative particle. The use of manual or non-manual features of negation is optional in Greek Sign …
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Design and Implementation of an Eye Blink Controlled Human Computer Interface
… who is restricted to only the control of eye and head movements. This system is based on infrared reflectivity to capture and analyze real time eye blink signal of the user. It uses simple economical hardware electronics to emulate the functionality of computer mouse click based on user eye …
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Mimicry and speciation in the parasitic finches of Africa
… not show adaptive plasticity in begging calls or head movements. This poor survival occurs despite there being minimal differences in the diets each host species feeds their young. Finally, in Chapter 6, I carry out a comparative analysis on the evolution of estrildid mouth markings. Estrildid …
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Eye movement studies with a vestibular prosthesis/
… gaze in healthy individuals by evoking eye movements that compensate for head movements. In this thesis, the prosthesis was used to probe the high frequency VOR in squirrel monkeys and guinea pigs. In two studies, modulated stimulation was applied acutely to characterize the VOR between 1.5 …
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