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Dissertations / Theses on the topic 'Visual Cortex'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Thulin, Nilsson Linnea. "The Role of Primary Visual Cortex in Visual Awareness." Thesis, Högskolan i Skövde, Institutionen för biovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11623.

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Despite its great complexity, a great deal is known about the organization and information-processing properties of the visual system. However, the neural correlates of visual awareness are not yet understood. By studying patients with blindsight, the primary visual cortex (V1) has attracted a lot of attention recently. Although this brain area appears to be important for visual awareness, its exact role is still a matter of debate. Interactive models propose a direct role for V1 in generating visual awareness through recurrent processing. Hierarchal models instead propose that awareness is ge

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2

Hardingham, Neil Robert. "Synaptic connections in rat visual cortex." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325298.

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3

Fotheringhame, David K. "Temporal coding in primary visual cortex." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339357.

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4

Nauhaus, Ian Michael. "Functional connectivity in primary visual cortex." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1692099811&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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5

Peelen, Marius Vincent. "Body selectivity in human visual cortex." Thesis, Bangor University, 2006. https://research.bangor.ac.uk/portal/en/theses/body-selectivity-in-human-visual-cortex(4091f96c-dee2-42ec-9a32-c0a8cf17b288).html.

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Perceiving other people is a seemingly effortless process. Yet within a few hundred milliseconds we are aware of who we are looking at, what this person is doing, and even what this person feels. We derive this information from the form and motion of the face and body. Faces may be particularly important for some aspects of person perception (e. g., identity recognition), whereas bodies may be more important for others (e. g., action recognition). Furthermore, information from the body is important in cases where it is not possible to perceive the details of the face, for instance when the fac

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6

Romo, Phillip Alfonso. "Visual processing in the higher cortices of the mammalian visual cortex." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/27311.

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Area 18 of the cat is the focus of this thesis as it a cortical area considered both primary visual cortex due to its direct LGN projections, but also an association visual cortex and homologue of the primate area V2. Visual cortical neurones are categorised as either simple or complex based on receptive field properties within a small, central excitatory region. But when stimuli are expanded beyond the confines of the central receptive field, a silent surround region is capable of playing a modulatory role on the centre response. Chapter 1 provides some historical background regarding the v

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7

Bernard, Clémence Francoise. "Otx2-glycosaminoglycan interaction to regulate visual cortex plasticity." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066228/document.

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Pendant le développement postnatal du cortex cérébral visuel, l'homéoprotéine Otx2 est transférée préférentiellement dans les interneurones inhibiteurs à parvalbumine (cellules PV), induit leur maturation et régule la période critique de plasticité pour la dominance oculaire. Pendant cette période critique, les cellules PV sont progressivement entourées par une matrice extracellulaire riche en glycosaminoglycanes (GAGs), qui pourraient être impliqués dans la capture d'Otx2. Pour étudier comment l'interaction entre Otx2 et les GAGs à la surface des cellules PV régule la période critique, nous a

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8

Krug, Kristine. "Ordering geniculate input into primary visual cortex." Thesis, University of Oxford, 1997. https://ora.ox.ac.uk/objects/uuid:b342ffae-4a31-4171-94a6-83cb516e83fe.

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Precise point-to-point connectivity is the basis of ordered maps of the visual field in the brain. One point in the visual field is represented at one locus in the dLGN and one locus in primary visual cortex. A fundamental problem in the development of most sensory systems is the creation of the topographic projections which underlie these maps. Mechanisms ranging from ordered ingrowth of fibres, through chemical guidance of axons to sculpting of the map from an early exuberant input have been proposed. However, we know little about how ordered maps are created beyond the first relay. What we

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9

Woodbury, Greg. "Modelling Emergent Properties of the Visual Cortex." University of Sydney. School of Mathematics and Statistics, 2003. http://hdl.handle.net/2123/695.

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10

Nicoll, A. J. "Excitatory synaptic connections in the visual cortex." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303635.

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11

Berman, Neil Jonathan. "Aspects of inhibition in the visual cortex." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303871.

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12

Ramachandran, Suchitra. "Visual Statistical Learning in Monkey Inferotemporal Cortex." Research Showcase @ CMU, 2014. http://repository.cmu.edu/dissertations/463.

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Despite living in noisy sensory environments, humans and non-human primates have the ability to learn regularities and patterns in the environment solely on the basis of passive exposure. This ability to learn what is statistically likely and predictable in the environment is called statistical learning. Visual statistical learning of image sequences has been demonstrated at the level of single neurons in the rhesus macaque (monkey) inferotemporal cortex (IT). Upon subjecting monkeys to extensive exposure to pairs of images presented sequentially such that the display of one image always predi

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13

Lawrence, Samuel. "Global shape processing in human visual cortex." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/16448/.

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The research described in this thesis used a combination of neuroimaging, brain stimulation and psychophysical methods to explore the representation of global shape in human visual cortex. Global shape processing mechanisms integrate over local orientation information to form an abstracted representation of an object’s shape; an important processing step for accurate object recognition in the complex visual scenes of everyday life. This thesis presents evidence for a global shape processing stream in human lateral occipital cortex comprising brain areas LO1, LO2 and object-selective lateral oc

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14

Hesam, Shariati Nastaran. "A functional model for primary visual cortex." Thesis, The University of Sydney, 2012. http://hdl.handle.net/2123/8753.

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Many neurons in mammalian primary visual cortex have properties such as sharp tuning for contour orientation, strong selectivity for motion direction, and insensitivity to stimulus polarity, that are not shared with their sub-cortical counterparts. Successful models have been developed for a number of these properties but in one case, direction selectivity, there is no consensus about underlying mechanisms. This thesis describes a model that accounts for many of the empirical observations concerning direction selectivity. The model comprises a single column of cat primary visual cortex and a s

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15

Mohamed, Abdelhack. "Top-down Modulation in Human Visual Cortex." Kyoto University, 2019. http://hdl.handle.net/2433/242434.

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16

Montobbio, Noemi <1992&gt. "A metric model of the visual cortex." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9101/1/montobbio_noemi_tesi.pdf.

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The purpose of this thesis is the development of a model for the geometry of the connectivity of the primary visual cortex (V1), by means of functional analysis tools on metric measure spaces. The metric structure proposed to describe the internal connections of V1 implements a notion of correlation between neurons, based on their feature selectivity: this is expressed through a connectivity kernel that is directly induced by the local feature analysis performed by the cells. Such kernel carries a geometrical structure consistent with the well-known properties of long-range horizontal connecti

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17

Duffy, Kevin R. "The maturation and experience-dependent plasticity of the developing visual cortex /." *McMaster only, 2001.

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18

Rudiger, Philipp John Frederic. "Development and encoding of visual statistics in the primary visual cortex." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25469.

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How do circuits in the mammalian cerebral cortex encode properties of the sensory environment in a way that can drive adaptive behavior? This question is fundamental to neuroscience, but it has been very difficult to approach directly. Various computational and theoretical models can explain a wide range of phenomena observed in the primary visual cortex (V1), including the anatomical organization of its circuits, the development of functional properties like orientation tuning, and behavioral effects like surround modulation. However, so far no model has been able to bridge these levels of de

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19

de, Haas B. "Contextual modulations of visual perception and visual cortex activity in humans." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1435556/.

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Visual perception and neural processing depend on more than retinal stimulation alone. They are modulated by contextual factors like cross-modal input, the current focus of attention or previous experience. In this thesis I investigate ways in which these factors affect vision. A first series of experiments investigates how co-occurring sounds modulate vision, with an emphasis on temporal aspects of visual processing. In three behavioral experiments I find that participants are unable to ignore the duration of co-occurring sounds when giving visual duration judgments. Furthermore, prolonged so

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20

De, Pasquale Roberto. "Visual discrimination learning and LTP-like changes in primary visual cortex." Doctoral thesis, Scuola Normale Superiore, 2009. http://hdl.handle.net/11384/85939.

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21

Prosper, Antoine. "Hebbian and Homeostatic plasticity in the adult visual cortex." Electronic Thesis or Diss., Université Paris sciences et lettres, 2025. http://www.theses.fr/2025UPSLE005.

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Cette thèse explore comment la plasticité hebbienne et homéostatique coexistent dans le système visuel adulte. Bien que ces deux mécanismes aient été étudiés dans des modèles animaux et durant le développement, leur interaction chez l’adulte humain n’a, à notre connaissance, pas été examinée systématiquement. Nous testons ici directement, pour la première fois, l’interaction de ces deux formes de plasticité chez l’adulte. À cette fin, nous présentons trois expériences combinant diverses techniques expérimentales : psychophysique, électroencéphalographie (EEG) chez l’humain et imagerie fonction

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22

Brady, Mark James. "Psychophysical investigations of incomplete forms and forms with background /." Diss., ON-CAMPUS Access For University of Minnesota, Twin Cities Click on "Connect to Digital Dissertations", 1999. http://www.lib.umn.edu/articles/proquest.phtml.

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23

Bartolucci, Marco. "Attentional modulations in the visual cortex in the absence of visual stimulation." Thesis, Royal Holloway, University of London, 2012. http://repository.royalholloway.ac.uk/items/5594dbe3-8d95-44e6-bda6-f0b0a37bfabe/1/.

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Every day we perceive visual scenes filled with different stimuli. Visual attention allows us to select the information that is most relevant to ongoing behaviour. The aim of this thesis is to explore how top-down modulations of activity in the human visual cortex affect perception and how attention interacts with visual processing in the brain. Specifically, we investigate the role of the modulation that occurs after a cue to attend but before onset of a visual stimulus, referred to in the literature as pre-stimulus attentional modulation, using fMRI methods alongside behavioural measurements

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24

CONVENTO, SILVIA. "The “multisensory” visual cortex: crossmodal shaping of visual cortical responses and perception." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/68621.

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The convergence and integration of information from the different sensory channels represents a fundamental ability of the human brain: in our daily life, multisensory cues impact our sensory system, shaping our perception of sensory events. Classical models of multisensory perception defer integration until sensory-specific information has been extensively processed. Strikingly, several anatomical studies now suggest that this view may be over-simplistic and that the substrate for multisensory integration is not constrained to the classical area of multisensory convergence; rather, it also oc

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25

Jadauji, Jahan. "Modulation of olfactory processing by visual cortex stimulation." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106393.

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In order to view the world in a unified manner, information from the different senses must combine at some point in the sensory stream. This is known as perceptual binding and has led to the study of how various senses interact, termed multisensory integration. An intriguing example of a crossmodal interaction is the finding from various imaging studies that primary visual cortex is activated while subjects performed purely olfactory tasks. This is in line with the literature documenting a connection between vision and olfaction, but whether visual cortical activity and olfactory perception ar

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26

Gharat, Amol. "Motion-defined contour processing in early visual cortex." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106530.

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From our daily experience it is very clear that relative motion cues can contribute to correctly identifying object boundaries and for perceiving depth. Motion-defined contours are not only generated by the motion of objects in a scene, but also by the movement of an observer's head and body. However the neural mechanism involved in detecting these contours is still unknown. To explore this mechanism, I extracellularly recorded responses of neurons in Area 18 of anesthetized and paralyzed cats while they were presented with visual stimuli. The goal of this study was to determine if neurons in

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27

Jeong, Su Keun. "Flexible visual information representation in human parietal cortex." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13068539.

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In many everyday activities, we must visually process multiple objects embedded in complex real world scenes. Our visual system can flexibly extract behaviorally relevant visual information from such scenes, even though it has a severely limited processing capacity. This dissertation proposes that human superior intra-parietal sulcus (IPS) plays a central role in this flexible visual information processing. In Chapter 1, using functional magnetic resonance imaging (fMRI) with univariate analysis, I found that distractor processing in superior IPS was attenuated when target locations were known

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28

Mineault, Patrick. "Parametric modelling of visual cortex at multiple scales." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123020.

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The visual system is confronted with the daunting task of extracting behaviourally relevant visual information from noisy and ambiguous patterns of luminance falling on the retina. It solves this problem through a hierarchical architecture, in which the visual stimulus is iteratively re-encoded into ever more abstract representations which can drive behaviour. This thesis explores the question of how the computations performed by neurons in the visual hierarchy create behaviourally relevant representations. This question requires probing the visual system at multiple scales: computation is the

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29

Coggan, David. "The neural representation of objects in visual cortex." Thesis, University of York, 2019. http://etheses.whiterose.ac.uk/22899/.

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Neuroimaging studies have shown that different categories of object evoke different neural responses in the ventral visual pathway. This has been interpreted to suggest that these regions represent high-level conceptual or semantic properties of the stimulus, such as its category. However, images from different categories differ in low-level visual properties. Therefore, the extent to which category-specific neural responses indicate high-level or low-level representations is unclear. This thesis investigates the extent to which low-level properties of objects are important in the neural respo

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30

Cadieu, Charles Fredrick. "Modeling shape representation in visual cortex area V4." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30367.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 85-89).<br>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 mechanism

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31

Pisauro, M. A. "Imaging haemodynamic activity in the mouse visual cortex." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1452981/.

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Neurovascular coupling, the relationship between neural and haemodynamic activity, is not a fixed property of the brain. Physiological, behavioural and cognitive factors can strongly modulate the degree to which haemodynamic responses to perceptual stimuli reflect co-localized neural responses. Moreover, a significant part of the haemodynamic activity is not directly coupled with the spiking activity. Here we show how anaesthesia can influence the relationship between haemodynamic and neural activity and how the former can be expressed as the sum of two components: one which is well coupled wi

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32

Freeborn, Robert Bruce. "A neural death model of the visual cortex." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394270.

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33

Michel, Vincent. "Understanding the visual cortex by using classification techniques." Paris 11, 2010. http://www.theses.fr/2010PA112202.

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Dans cette thèse, nous présentons différentes méthodes d'apprentissage statistique pouvant être utilisées pour comprendre le code neuronal des fonctions cognitives, en se basant sur des données d'Imagerie par Résonance Magnétique fonctionnelle (lRMf). Nous nous intéressons principalement à l'étude de la localisation spatiale des entités impliquées dans le codage, et leur influence respective dans le processus cognitif, en nous focalisant sur l'étude du cortex visuel. Après avoir introduit les notions de codage neuronal et d'imagerie fonctionnelle, nous étudions les limites de l'approche classi

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34

Bedford, James L. "Neuro-electromagnetic imaging of the human visual cortex." Thesis, Aston University, 1995. http://publications.aston.ac.uk/14604/.

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Methods of solving the neuro-electromagnetic inverse problem are examined and developed, with specific reference to the human visual cortex. The anatomy, physiology and function of the human visual system are first reviewed. Mechanisms by which the visual cortex gives rise to external electric and magnetic fields are then discussed, and the forward problem is described mathematically for the case of an isotropic, piecewise homogeneous volume conductor, and then for an anisotropic, cocentric, spherical volume conductor. Methods of solving the inverse problem are reviewed, before a new technique

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35

Saenz, Melissa. "Global effects of attention in human visual cortex /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3071014.

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36

Watson, David M. "The neural representation of scenes in visual cortex." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/12961/.

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Recent neuroimaging studies have identified a number of regions in the human brain that respond preferentially to visual scenes. These regions are thought to underpin our ability to perceive and interact with our local visual environment. However, the precise stimulus dimensions underlying the function of scene-selective regions remain controversial. Some accounts have proposed an organisation based on relatively high-level semantic or categorical properties of the stimulus. However, other accounts have suggested that lower-level visual features of the stimulus may offer a more parsimonious ex

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37

Ajina, Sara. "Changes in connectivity, structure and function following damage to the primary visual cortex." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:2e274261-c71a-4ad1-82cf-2fe6bbdbf673.

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Residual vision, or blindsight, following damage to the primary visual cortex was first identified almost a century ago. However, the mechanism and pathways underlying this ability, as well as the extent of visual function, remain unclear and are a continuing source of speculation. The work presented here goes some way to try to address these questions, investigating 18 patients with V1 damage and homonymous visual field loss acquired in adulthood. Six experimental chapters explore the extent and potential for visual function after V1 damage, and apply novel neuroimaging paradigms and techniqu

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38

Ip, Ifan Betina. "Effects of visual attention on stereoscopic depth perception in the human visual cortex." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543544.

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39

Liu, Xiaochen. "Modelling Functional Maps and Associated Visual Gamma Activities in the Primary Visual Cortex." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28536.

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The mammalian primary visual cortex (V1) has been extensively studied over the last decades to probe the neural mechanisms behind visual perception of elementary visual features such as edges, direction of motion, and colour. Numerous experiments have visualized the ordered arrangement of various functional maps in V1 and measured the neural activity patterns associated with them. However, only a few studies have quantitatively modelled the influences of the spatial structure of the functional maps on the neural activities. Moreover, the experimental maps usually show a great degree of irregul

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40

Zumbroich, Thomas J. "The organization and development of the lateral suprasylvian visual areas of the cat visual cortex." Thesis, University of Oxford, 1986. http://ora.ox.ac.uk/objects/uuid:5ba54462-21db-4207-b591-e79c26cb06ab.

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41

Leinweber, Marcus. "Development of orientation preference maps in ferret visual cortex." Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-135685.

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42

Spacek, Martin A. "Characterizing patches of primary visual cortex with minimal bias." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/53975.

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The brain is highly complex, and studying it requires simplifying experiments, analyses, and theories. New techniques can capture more of the brain's complexity while reducing biases in our understanding of how it works. This thesis describes experiments in primary visual cortex of anesthetized cat, using high-density silicon multisite electrodes to simultaneously record from as many neurons as possible across all cortical layers, thereby characterizing local cortical populations with minimal bias. Recordings were maintained for many hours at a time, and included both spontaneous and stimulus-

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43

Jia, Wei-Guo. "Calcium-related signal transduction systems in developing visual cortex." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30927.

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Neuronal connections in cat visual cortex are highly susceptible to visual experience at early postnatal age and thus serve as a useful model of neural plasticity. The biochemical mechanisms underlying this cortical plasticity remain unclear. In this thesis, the development of several elements in calcium-related signal transduction systems, including the type-1 muscarinic and alpha-1 adrenoceptor systems as examples of cell surface receptors and protein kinase C. calcium/calmodulin dependent kinase II and inositol 1,4,5 phosphotate receptors as second messenger targets, were investigated using

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Sammons, Rosanna Penelope. "Mechanisms of homeostatic plasticity in the mouse visual cortex." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/mechanisms-of-homeostatic-plasticity-in-the-mouse-visual-cortex(9740e4f1-b25c-4e9e-8905-c3547e552ff3).html.

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During development, newly established cortical circuits are undergoing a period of experience dependent refinement. Visual deprivation during this time leads to the induction of plasticity mechanisms, including homeostatic plasticity measures. These are a distinct set of plasticity mechanisms thought to play a role in maintaining stability within networks, and preventing large perturbations in overall activity levels. Homeostatic plasticity mechanisms can be divided into synaptic and intrinsic mechanisms. While details of individual mechanisms are reasonably well understood, details of how the

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Koski, Lisa Marie. "The role of frontal cortex in visual selective attention." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0017/NQ55350.pdf.

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46

Thomson, J. Ross. "Models of pattern formation on the primate visual cortex." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55635.

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47

Palmer, Joanne Eryl. "Functioning of the visual cortex in patients with migraine." Thesis, Lancaster University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369653.

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48

McKay, Sarah Maree. "The nature of the first responses in visual cortex." Thesis, University of Oxford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403576.

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49

Ranson, Adam. "Development and plasticity of the mouse primary visual cortex." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/54216/.

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A strain difference was observed in juvenile OD plasticity between C57BL/6J and C57BL/6JOlaHsd mice whereby open eye 'homeostatic' potentiation was completely absent in the C57BL/6JOlaHsd strain. This was accompanied by an absence of dark exposure induced synaptic scaling as measured <italic>ex vivo.</italic> In contrast in adulthood both strains showed comparable open eye potentiation, suggesting a mechanistic difference between juvenile and adult plasticity. Preliminary data suggests that while juvenile open eye potentiation is homeostatic, in adulthood it may be more LTP like and dependent

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Burgess, C. P. "Measuring correlates of perceptual decisions in mouse visual cortex." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1473920/.

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The activity of sensory cortex is determined not only by afferent sensory stimuli, but also by behavioural context factors such as movement, anticipation, attention, and reward. To investigate such factors, I developed a visual psychophysical task in head-fixed mice and combined it with two-photon calcium imaging to measure activity in primary visual cortex (V1). I trained mice to report the position of a grating by turning a wheel with their forepaws. I found that a crucial element in helping mice learn the task was enabling them to control the position of the stimulus: the grating would init

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