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 216 for “"visual cortex"”.
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Circuit Dynamics of Adult Visual Cortex
… has been assumed that connections in the primary visual cortex (V1) become static after the critical period. Recent studies show, however, that dendritic spines appear and disappear during adulthood in the normal brain. Our first objective was then to determine whether axonal branches and boutons …
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Modeling shape representation in visual cortex area V4
Visual processing in biological systems is classically described as a hierarchy of increasingly sophisticated representations, originating in primary visual cortex (V1), progressing through intermediate area V4, and ascending to inferotemporal cortex. The computational mechanisms that produce …
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Adaptivity of Sensory Representations in the Adult Visual Cortex
Die sich entwickelnden sensorischen Areale des Gehirns werden geformt durch eine Kombination von Umwelteinflüssen und generischen Faktoren. Experimentelle Studien haben jedoch gezeigt, dass sie auch im adulten Tier erstaunlich adaptiv sind. Wie untersuchen die Repräsentation visueller Information …
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Neural Processing in the Three Layer Turtle Visual Cortex
… we investigate neural processing in turtle visual cortex. To this end, we characterize the nature of both spontaneous, ongoing neural activity as well as activity evoked by visual stimulation. Data are collected from whole brain eye-attached preparations, recording with extracellular and …
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Dynamic and Integrative Properties of the Primary Visual Cortex
… We have studied these processes in the primary visual cortex (V1), where neurons have been proposed to integrate visual inputs along a geometric pattern known as the association field (AF). We first used cortical reorganization as a model to investigate the role that a specific network of V1 …
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Top-Down Control of Lateral Interactions in Visual Cortex
… of integrating information over a large area of visual field. Their responses to local features are dependent on the global characteristics of contours and surfaces that extend well beyond their receptive fields. These contextual influences in V1 are subject to cognitive influences of attention, …
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Sensory uncertainty and response variability in human visual cortex
Contains fulltext : 175654.pdf (Publisher’s version ) (Open Access)
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Inhibition stabilized network model in the primary visual cortex
… surround suppression experiments in the primary visual cortex with direct membrane conductance measurements (Ozeki et al., 2009). In our work, we used a linearized rate model of both excitatory and inhibitory populations with weight matrices dependent on the locations of the neurons. We applied …
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Interlaminar Interactions in the Cat Visual Cortex (Laminae, Columns)
One component of the vertical organization of visual cortex is the projection of cells in supragranular layers to cells in the infragranular layers. By recording from cells in the infragranular layers during synaptic inactivation of layers 1-3, I have examined the possibility that this projection …
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The mechanisms of reliable coding in mouse visual cortex
… bombarded with information. Neurons in the visual cortex have to transform these complex inputs into robust and parsimonious neural codes that effectively guide behavior. The ability of neurons to efficiently convey information is, however, limited by intrinsic and shared variability. …
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Passive experience-dependent plasticity in mouse primary visual cortex
… plasticity readily measured in primary visual cortex (V1) of mice. Chronic local field potential (LFP) recordings in layer 4 (L4) of V1 allow for the tracking of visually evoked potentials (VEPs) in response to phase-reversing sinusoidal grating stimuli. As a given visual stimulus …
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Role of Mouse Visual Cortex in Perception of Stimulus Features
<p>Information about diverse visual features is encoded in distributed visual cortical areas. Which area/areas are required for perception for a given visual feature and how the encoded visual information is computed to guide visual perception are the main questions of this dissertation. Here I …
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Unsupervised learning of invariant object representation in primate visual cortex
Visual object recognition (categorization and identification) is one of the most fundamental cognitive functions for our survival. Our visual system has the remarkable ability to convey to us visual object and category information in a manner that is largely tolerant ("invariant") to the exact …
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Modeling orientation and ocular dominance columns in the visual cortex
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Computational models of contrast and orientation processing in primary visual cortex
Der primäre visuelle Kortex (V1) ist das erste kortikale Areal, das in der Verarbeitung visueller Informationen involviert ist. Die Zellen dieses Areals reagieren auf grundlegende Stimuluseigenschaften wie Kontrast oder Orientierung. Auch wenn es sich um den meistuntersuchten Teil des visuellen …
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Form in Darkness: Linking Visual Cortex Structure With Spontaneous Neural Function
Spontaneous neural activity within visual cortex is synchronized at varying spatial scales, from the cytoarchitecural level of individual neurons to the coarse scale of whole regions. The neural basis of this synchronicity remains ambiguous. In this thesis, we focus on the role visual experience …
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Organization of the Clare-Bishop Area of Cat Visual Cortex (Extrastriate)
The primary visual pathway consists of projections from the retina to the lateral geniculate nucleus (LGN) and from the LGN to the visual cortex. The cat LGN has 3 major subdivisions containing independent representations of visual space: A layers, C layers, and the medial interlaminar nucleus …
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Functional implications of behavioral experience effects upon the rat visual cortex
"In layer II/III of the visual cortex, synaptic transmission at the level of the field evoked response, which included a population spike (PS), a field excitatory postsynaptic potential (fEPSP) and slow components, was characterized in response to the stimulation of lateral white matter. The PS of …
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