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 33 for “"Vergence"”.
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Quantification of neural substrates of vergence system via fMRI
Vergence eye movement is one of the oculomotor systems which allow depth perception via disconjugate movement of the eyes. Neuroimaging methods such as functional magnetic resonance imaging (fMRI) measure neural activity changes activity in the brain while subjects perform experimental tasks. A …
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Cortical location of saccadic and vergence oculomotor learning using fMRI
… movements typically used during reading. The vergence system encompasses disconjugate movements of the eyes and provides perception of the depth of the objects. When a visual task is learned by a person, the latency and the peak velocity, inversely modulate according to each other under …
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The effect of vergence vision training on binocularly normal subjects
Vergence is the disjunctive (inward or outward) movement of the eyes that is stimulated by retinal disparity (difference of where an image is projected to the retina and the fovea). A recent randomized clinical trial showed the efficacy of vision therapy for children with the binocular dysfunction …
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Short term modification of vergence ramp eye movements in the convergent direction
… various effects of short-term modification on vergence, saccadic and smooth pursuit eye movements. Previous vergence studies have concentrated on step modification stimuli. Few have investigated the effects of short-term modification on vergence ramp movements. Thus, this study explores the …
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Tracking moving object by stereo vision head with vergence for humanoid robot
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Does vergence influence the vestibulo-ocular reflex in human subjects rotating in the dark?
… we wished to determine the subject's vergence point, which cannot be accomplished using data obtained from only one eye. Hence, a binocular eye-tracking system that works in the dark was required. In the experiment described in this thesis, the subject was rotated in the dark on …
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Visualeyes 2020: a software suite to integrate instrumentation to study the near triad of vergence
… suite is designed to track rotation of each eye (vergence) as well as measure the lens power of the eye's lens (accommodation). The system is designed to dissect the near triad which is composed of the pupil constriction, vergence and accommodation. The visual targets are programmed to be shown on …
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A LabVIEW program to obtain the initiating component of a vergence eye movement in an open-loop experiment
The vergence oculomotor system is used in viewing objects moving in depth, such as when a baseball player tracks a ball moving towards him. It is composed of two components according to the Dual Mode Theory; a fast preprogrammed initiating component and a slow feedback-controlled sustaining …
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A multimodal investigation in eye movements
… interest (ROIs) are functionally active during a vergence movement (inward or outward eye rotation), task-modulated coactivation between ROIs is less understood. This study tests the following hypotheses: (1) significant task-modulated coactivation would be observed between the frontal eye fields …
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Are you looking at me? About the perception of direct gaze and gaze direction
… dissertation extends this view on the role of vergence eye movements and the angle kappa, i.e., the deviation of the pupillary from the foveal axis, since they influence the visible pupil position as well. <br />Our first study revealed that humans accept a large range of vergence angles as …
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Laramide transpression and oblique thrusting in the northeastern Front Range, Colorado: 3D kinematics of the Livermore Embayment
… thrusts which commonly alternate flanks and vergence directions along strike. Transition zones, where thrust vergence reverses along the strike of an arch, exhibit three-dimensional structural complexities due to diverse trends and geometries of secondary faults and folds. The role of …
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Perception and Eye Alignment Control: Do People Think the Same Way Their Brain Thinks?
… depth perception and reflexive disparity vergence. Stereoscopic thresholds typically improve with increasing target contrast, but when only one eye’s target contrast increases, the stereoscopic thresholds are worse than for equal low contrast. A similar effect occurs for motion and vernier …
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A quantitative analysis of eye movement characteristics during the cover test
… phase consisted of a variety of saccadic and vergence movements. There was a statistical difference between exophores and esophores for frequencies of initiating saccades and vergence eye movements (p < 0.001) with esophores more commonly commencing recovery with a saccade and exophores with a …
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Holographic augmented reality : towards near-to-eye electroholography via guided wave acousto-optics
… consistently present correct accommodation and vergence cues to the viewer, limiting their potential for seamless, comfortable augmented reality applications. Recent techniques based around light-field display methods show promise in the delivery of consistent depth cues although their …
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THE IMPACT OF CONCUSSION HISTORY ON THE NEAR REFLEX AND PUPILLARY LIGHT REFLEX IN VIRTUAL REALITY
… numerous oculomotor functions, including convergence, accommodation, and pupillary response, are commonly found to be impacted by mTBI. Deficits in oculomotor responses produce significant impairments to a patient’s quality of life, such as difficulties reading, challenges driving, motion …
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Morphology and structure of the accretionary prism offshore North Sumatra, Indonesia and offshore Kodiak Island, USA : a comparison to seek a link between prism formation and hazard potential
… along strike where a predominantly landward vergence zone exists from the deformation front for a distance ~70 km landward. An extended landward vergence zone is not common; for northern Sumatra, a seaward dipping rigid backstop may be the reason, which assists subsequent younger accreted …
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Structural geology and stratigraphy at the junction of the curral anticline and the moeda syncline, Quadrilatero Ferrifero, Minas Gerais, Brazil
… the earlier D1 with a north-westward vergence and the later D2 -episode, with a westward vergence. Extensive development of quartz and muscovite in the sediments and of chlorite and talc in the mafic and ultramafic greenstones, and the quartz grain-size in itabirite, in general, …
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Kinematic analyses of discfolds in Devonian Millboro Formation in the Central-Southern Appalachian junction zone
… northwest-trending slip lines, and overall vergence of the shear zones to the northwest. Discfolds on northwest limbs of major anticlines were produced by shearing along late-stage, southeast-dipping reverse faults, and those on the southeast limbs by shearing along southeast-dipping, …
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