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 270 for “"Visual system"”.
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Temporal encoding in the visual system
… model for temporal and spatial encoding in the visual system is developed and presented. The model indicates that spatial information is encoded in a manner similar to the encoding of temporal information. Experimental evidence related to this model is presented and analyzed. The temporal part …
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Mechanisms of Feedback in the Visual System
Feedback is an ubiquitous feature of neural systems though there is little consensus on the roles of mechanisms involved with feedback. We set up an in vivo preparation to study and characterize an accessible and isolated feedback loop within the visual system of the leopard frog, Rana pipiens. We …
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Molecular Evolution of Visual System Genes in Fishes
… of prey and predators. Selection on the visual system should therefore be strong, especially when ecological or genomic changes open new avenues for evolutionary changes. Visual system proteins are thus attractive systems for molecular evolutionary analyses. This thesis presents a …
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Mechanisms of Sensory Adaptation in the Primate Visual System
… addition, the amount of information reaching our visual system far exceeds the brain’s information processing capacity. Given the limited dynamic range of its neurons and its limited capacity in processing visual information in real-time, the brain deploys both structural and functional solutions …
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Structural dynamics and synaptic development in the visual system
This thesis takes as its subject three model systems which exhibit interesting properties in the developing nervous system. The first study details the developmental properties of dendritic spines, the principle sites of excitatory synaptic contacts, during a period of synaptogenesis in the …
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Encoding surfaces from motion in the primate visual system
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1992.
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Wavelet-based Image Compression Using Human Visual System Models
… Moreover, the sensitivities of the human visual system (HVS) are often not incorporated into compression schemes. This paper develops new wavelet models of the HVS and illustrates their performance for various scalar wavelet and multiwavelet transforms. The performance is measured …
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Filopodial Dynamics and Synapse Specification in the Drosophila Visual System
… on this overarching question using the complex visual processing circuitry of D. melanogaster. This system not only provides excellent genetic amenability but also a model where almost all connectivity can be built without environmental input, i.e. it is genetically hardwired. Nearly three …
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Interactions of luminance, color and motion in the visual system
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Brain and Cognitive Sciences, 1992.
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Visual system analysis through use of finite field sine gratings.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering, 1973
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THE CRAYFISH VISUAL SYSTEM: INTRACELLULAR STUDIES AND MORPHOLOGIES OF IDENTIFIED INTERNEURONS
… preparation was developed which maintains visual responses and enables intracellular recordings to be made from the optic lobes of the crayfish compound eye. Sustaining fibers (SFs) were impaled with lucifer yellow electrodes near their entrance to the second optic ganglion or Medulla …
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Axon guidance in the zebrafish visual system: Analysis of Esrom Mutant
… branching and skin pigmentation. In the visual system esrom is necessary for the formation of topographic map along the A-P and D-V axis, correct innervation of the pretectal targets and axon bundling in the optic tract. The gene function is required in the eye for retinal ganglion cell …
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Processing of transient stimuli by the visual system of the rat
… electrophysiology using a variety of sustained visual stimuli has made a significant contribution to many aspects of visual function, it has not supported the existence of intracortical circuit operations in cortical processing. This study investigated cortical processing by a comparison of the …
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Invariance properties of the human visual system in one-shot learning
This work first characterizes human invariant recognition in one-shot learning. By using novel stimuli, we address the question whether invariance to transformation emerges from experience and memorization of templates or from the brain instantly computing invariant representation. Our …
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Signal transformation at the input and output of the Drosophila visual system
A key function of the nervous system is to sample data from the external world, generate internal signals, and transform them into meaningful information that can be used to trigger behaviour. In order to gain insight into the underlying mechanism for signal transformation, the visual system has …
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Visual System Development in People with One Eye: Behaviour and Structural Neural Correlates
… have either been assessed in species whose visual system is quite different from humans, or in enucleated monkeys and humans following short-term survival. In this dissertation, I sought to determine the long-term effects of enucleation on visual system development by examining behavioural …
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Noise-Enhanced and Human Visual System-Driven Image Processing: Algorithms and Performance Limits
… on stochastic resonance (SR) noise and human visual system (HVS) properties, where several novel frameworks and algorithms for object detection in images, image enhancement and image segmentation as well as the method to estimate the performance limit of image segmentation algorithms are …
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A Signal Detection Analysis of Temporal Summation and Masking in the Visual System
Made available in DSpace on 2014-12-08T23:01:20Z (GMT). No. of bitstreams: 1 6511874.pdf: 2432991 bytes, checksum: 1ccc1d87bf4d0c66ce823f255a0ad6b8 (MD5) Previous issue date: 1965
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