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 83 for “"Oculomotor"”.
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Oculomotor Control in Patients with Parkinson's Disease
There have been few studies investigating the eye movement behavior of Parkinson’s disease patients during fixation. This study objectively measured the eye movements of 36 patients with Parkinson’s disease, and 20 age matched controls. Stimuli consisted of ten standardized text passages first …
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Dependencias tróficas y sinápticas del sistema oculomotor.
… obtenidos se concluye que las motoneuronas oculomotoras deaferentadas mantienen una dependencia con los factores neurotróficos. Finalmente, se caracterizó mediante inmunocitoquímica y Western blot la presencia de neurotrofinas en el sistema motor ocular, resistente a la degeneración …
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Nystagmus generation, oculomotor tracking and visual motion perception.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1974.
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Visual-Oculomotor and Head Movement Strategies in Postural Control
Postural control requires the integration of visual, vestibular, and proprioceptive information to maintain stability. The gold standard for inferring postural control relies on lab-based tools, such as force plates and full-body motion capture to track center of mass (COM) and center of pressure …
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Cortical location of saccadic and vergence oculomotor learning using fMRI
… how two of the five eye movement systems utilize oculomotor learning. Saccadic eye movements are used to quickly shift the fovea to objects using conjugate movements typically used during reading. The vergence system encompasses disconjugate movements of the eyes and provides perception of the …
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Task-Dependent Oscillatory Brain Activity During Oculomotor Delayed Response Task
This study used three Oculomotor Delayed Response (ODR) tasks to investigate the unique cognitive demands during the delay period. Changes in alpha power were used to index cognitive efforts during the delay period. Continuous EEGs from 25 healthy young adults (18-34 years) were recorded using …
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The lateral geniculate nucleus: Morphogenesis, functional specializations, and oculomotor feedback
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Identification and Progression of Oculomotor Impairments in Acute Sport-Related Concussion
… concussion (SRC) can disrupt visual and oculomotor functions, yet many clinical assessments remain subjective and may miss subtle deficits, especially in the acute injury window. This dissertation examined whether SRC is associated with measurable impairments in eye movement control and …
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Roles Of Inhibitory Interneurons In Cerebellar Cortical Processing For Oculomotor Control
… monkeys and control a variety of vestibulo-oculomotor tasks, characterizing the oculomotor behavioral repertoire of the squirrel monkey in comparison to that of the rhesus macaque, and developing two techniques for examining the roles of interneurons in cerebellar processing. In the second, …
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Spatial Disorientation in Hypergravity: Implication of oculomotor, otolithic and somatosensory cues
Travelling on board of locomotion vehicles often induce sensorial stimulations which provoke perceptive illusions. These erroneous perceptions of body position were defined in the literature as spatial disorientation, which is principally considered as otolithic origin. In fact, during a forward …
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Optogenetic disruption of memory-drive, oculomotor behavior in the non-human primate
Pharmacological inactivation studies have shown that the frontal eye field (FEF) is critical for executing saccades to remembered locations. FEF neurons increase their firing rate during the three epochs of the memory-guided saccade task: visual stimulus presentation, the delay interval, and motor …
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Sensory and Cognitive Influences on Oculomotor and Whole-body Coordination during Standing Turns
… coordination were unaffected. We conclude that oculomotor nystagmus during turning represents a crucial component of an automatic, subcortically generated motor synergy, the release of which is dependent on cortical and sensory input (i.e. eye and neck proprioception). We propose that turning …
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Cognitive impairment in chronic kidney disease : are oculomotor tests an effective detection marker?
… Previous research has demonstrated that oculomotor tasks may be advantageous over traditional neuropsychological measures for detecting CI in early Alzheimer’s disease, specifically uncorrected error rate in the anti-saccade paradigm. This particular measure examines individuals’ …
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Sources and Targets of Trophic Factors in the Avian Locus Coeruleus and Oculomotor System
… transmission example.The developing chicken oculomotor system was chosen to explore the contributions of different potential sources of insulin-like growth factor I (IGF-I) for extraocular muscles (EOM). IGF-I is a potent myogenic growth factor. The oculomotor system studied in this project …
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Oculomotor and electrophysiological markers of cognitive distraction during low-level and complex visual tasks
… this current thesis was to consider 1) whether oculomotor and electrophysiological metrics could act as markers of cognitive distraction; 2) whether decrements in hazard perception performance caused by secondary cognitive task demand are to some extent due to cognitive load interfering with …
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Eye movements in reading strategies : how reading strategies modulate effects of distributed processing and oculomotor control
Throughout its empirical research history eye movement research has always been aware of the differences in reading behavior induced by individual differences and task demands. This work introduces a novel comprehensive concept of reading strategy, comprising individual differences in reading style …
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Differences in image properties across facial expressions: effects on perceived contrast, stimulus efficacy and oculomotor responses
Studies within visual psychophysics suggest that fearful facial expressions possess a special status within the visual system. This is evidenced across a range of experimental paradigms that together suggest perceptual biases for fearful expressions are driven by their low spatial frequency …
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The influences of preparation and brain states on the time-course of oculomotor control in visual selection
… concurrently. Results revealed that slow oculomotor reaction times in the non-salient target condition were predicted by an overall increase of power in the alpha range. Additionally, higher alpha pre-stimulus activity seems to predict erroneous response similarly for fast and slow …
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Influence of Head Impact Exposure on Oculomotor Function and Pupillary Light Reflexes in Men and Women Soccer Players
… concussive injuries which can be quantified via oculomotor function and pupillometry. Currently, King Devick (KD) style tests and Pupillary Light Reflex (PLR) are two popular tests that can be administered to athletes to gather clinical eye measures relating to oculomotor function and …
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