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Dissertations / Theses on the topic 'Cortex in visual stimulus'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Husain, M. "On hemispheric specialisation and visual direction sensing." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382681.

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2

Baker, Pamela Mary. "The contribution of cortical microcircuitry to stimulus masking effects in cat primary visual cortex /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17615.

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3

Lin, Yan. "Investigating stimulus induced metabolic changes in human visual cortex using functional magnetic resonance spectroscopy at 7T." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/14589/.

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This thesis concerns the investigation of metabolic changes in 1H metabolite levels in the human visual cortex due to visual stimulation using proton magnetic resonance spectroscopy (1H-MRS) at 7T. The work described in this thesis has been undertaken by the author and collaborators at the Sir Peter Mansfield Magnetic Resonance Centre at the University of Nottingham. Detection of functional changes in 1H metabolites may enable a greater understanding of neurotransmitter activity and metabolic pathways used for energy synthesis during activation of brain tissue. Previous 1H MRS studies of the a

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4

Pietravalle, Nadia. "How well does a linear model predict the responses of primary visual cortex neurons to a natural scene stimulus?" Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/30518.

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The goal was to test how well a linear model of the responses of neurons in area 18 of cat visual cortex, derived from recordings made in anaesthetized adult cats, predicts responses to natural scene stimuli. Methods: Estimates of the spatio-temporal receptive field profile of the neurons were obtained by reverse correlation to an m-sequence stimulus (Reid et al., 1997). The receptive field estimate, together with a non-linear response function, was then used to give the expected probability, or rate, of spike firing (Chichilnisky, 2001; Ringach & Malone, 2007) during a time-varying natural

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5

Keemink, Sander Wessel. "Coding of multivariate stimuli and contextual interactions in the visual cortex." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/28969.

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The primary visual cortex (V1) has long been considered the main low level visual analysis area of the brain. The classical view is of a feedfoward system functioning as an edge detector, in which each cell has a receptive field (RF) and a preferred orientation. Whilst intuitive, this view is not the whole story. Although stimuli outside a neuron’s RF do not result in an increased response by themselves, they do modulate a neuron’s response to what’s inside its RF. We will refer to such extra-RF effects as contextual modulation. Contextual modulation is thought to underlie several perceptual p

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6

Giacherio, Brenna. "Evaluation of Functional Near Infrared Spectroscopy (fNIRS) for Assessment of the Visual and Motor Cortices in Adults." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401816241.

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7

Tigwell, D. A. "Directional and orientational tuning in the striate cortex of the cat for contrast and textured stimuli." Thesis, Keele University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237754.

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8

Shaw, Lynda Joan. "Emotional processing of natural visual images in brief exposures and compound stimuli : fMRI and behavioural studies." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3203.

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Can the brain register the emotional valence of brief exposures of complex natural stimuli under conditions of forward and backward masking, and under conditions of attentional competition between foveal and peripheral stimuli? To address this question, three experiments were conducted. The first, a behavioural experiment, measured subjective valence of response (pleasant vs unpleasant) to test the perception of the valence of natural images in brief, masked exposures in a forward and backward masking paradigm. Images were chosen from the International Affective Picture System (IAPS) series. A

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9

Kara, Prakash. "Processing of transient stimuli by the visual system of the rat." Master's thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/26626.

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While three decades of intensive cortical 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 response of primary visual cortical neurones to transient electrical and strobe-flash stimulation. Experiments were performed on 74 anaesthetised Long Evans rats. Standard stereotaxic and extracellular electrophysiological techniques were employed. Continuous (o

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10

Killian, Nathaniel J. "Bioelectrical dynamics of the entorhinal cortex." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52148.

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The entorhinal cortex (EC) in the medial temporal lobe plays a critical role in memory formation and is implicated in several neurological diseases including temporal lobe epilepsy and Alzheimer’s disease. Despite the known importance of this brain region, little is known about the normal bioelectrical activity patterns of the EC in awake, behaving primates. In order to develop effective therapies for diseases affecting the EC, we must first understand its normal properties. To contribute to our understanding of the EC, I monitored the activity of individual neurons and populations of neurons

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11

Crook, J. M. "A neurophysiological investigation of the feline extrastriate visual cortex (area 18) using oriented and textured stimuli : A comparison with area 17." Thesis, Keele University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379422.

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12

Kremkow, Jens Oliver. "Correlating excitation and inhibition in visual cortical circuits : functional consequences and biological feasibility." Aix-Marseille 2, 2009. http://www.theses.fr/2009AIX20677.

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The primary visual cortex (V1) is one of the most studied cortical area in the brain. Together with the retina and the lateral geniculate nucleus (LGN) it forms the early visual system, which has become a common model for studying computational principles in sensory systems. Simple artificial stimuli (such as drifting gratings (DG)) have given insights into the neural basis of visual processing. However, recently more and more researchers have started to use more complex natural visual stimuli (NI), arguing that the low dimensional artificial stimuli are not sufficient for a complete understan

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13

Khastkhodaei, Zeinab [Verfasser], and Laura [Akademischer Betreuer] Busse. "Processing of second-order, contrast-modulated stimuli in mouse visual cortex / Zeinab Khastkhodaei ; Betreuer: Laura Busse." Tübingen : Universitätsbibliothek Tübingen, 2017. http://d-nb.info/1167247108/34.

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14

Shulz, Daniel. "Un analogue cellulaire de la plasticité fonctionnelle dans le cortex visuel : étude des mécanismes neuronaux de l'épigénèse et de l'apprentissage." Paris 11, 1987. http://www.theses.fr/1987PA112420.

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15

Lewis, Lindsay Burke. "Cross-modal plasticity for tactile and auditory stimuli within the visual cortex of early blind human subjects." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3338839.

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Thesis (Ph. D.)--University of California, San Diego, 2009.<br>Title from first page of PDF file (viewed January 13, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 194-211).

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16

Ocazionez, Sergio Andr?s Conde. "The influence of visual inter-hemispheric connections on spiking, assembly and LFP activities, and their phase relationship during figure-ground stimulation." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17032.

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Made available in DSpace on 2014-12-17T15:29:22Z (GMT). No. of bitstreams: 1 SergioACO_TESE.pdf: 4589227 bytes, checksum: 062baf399b5377e444d02b747586f12b (MD5) Previous issue date: 2014-03-31<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Desde os descobrimentos pioneiros de Hubel e Wiesel acumulou-se uma vasta literatura descrevendo as respostas neuronais do c?rtex visual prim?rio (V1) a diferentes est?mulos visuais. Estes est?mulos consistem principalmente em barras em movimento, pontos ou grades, que s?o ?teis para explorar as respostas dentro do campo receptivo cl?ssi

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17

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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18

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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19

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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20

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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21

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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22

Randell, Thomas David William. "Stimulus equivalence and naming." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312896.

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23

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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24

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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25

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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26

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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27

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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28

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

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29

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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30

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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31

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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32

Ludwig, Casimir Johannes Hendrikus. "Stimulus-driven and goal-driven control over visual selection." Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269218.

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33

Herbst, Sophie. "How visual stimulus dynamics affect mechanisms of interval timing." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2014. http://dx.doi.org/10.18452/17078.

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Gegenstand dieser Arbeit ist die Divergenz zwischen subjektiver und objektiver Zeitwahrnehmung. In drei empirischen Studien wird untersucht, wie Zeitwahrnehmung vom Inhalt eines Zeitintervalls beeinflusst wird. Dabei werden Paradigmen aus der Forschung zur visuellen Wahrnehmung mit Messungen der Zeitwahrnehmung kombiniert und durch Ableitungen neuronaler Aktivität (Elektroenzephalographie) ergänzt. Sensorische Modelle der Zeitwahrnehmung basieren auf der Annahme, dass die subjektive Dauer eines sensorischen Reizes in den selben neuronalen Netzwerken entsteht, die den Reiz selbst verarbeiten.

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34

Patrick, Jonathan A. "Optimisation of peripheral visual function using stimulus-based manipulations." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40607/.

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Ocular disorders that restrict visual capacity in the centre of the visual field, such as age-related macular degeneration (AMD) and Stargardt’s disease, force patients to perform important visual tasks in the periphery. It is well documented that visual performance is progressively limited as the peripheral eccentricity at which the task is performed increases. Since many of the disorders that cause central vision loss currently have no cure, adaptive techniques to optimise the remaining visual function are required. This thesis describes a series of psychophysical experiments that aim to opt

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35

Hodgskiss, Dean Leslie. "Towards improved visual stimulus discrimination in an SSVEP BCI." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/11283.

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The dissertation investigated the influence of stimulus characteristics, electroencephalographic (EEG) electrode location and three signal processing methods on the spectral signal to noise ratio (SNR) of Steady State Visual Evoked Potentials (SSVEPs) with a view for use in Brain-Computer Interfaces (BCIs). It was hypothesised that the new spectral baseline processing method introduced here, termed the 'activity baseline', would result in an improved SNR.

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36

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

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37

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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38

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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39

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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40

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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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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42

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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43

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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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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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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46

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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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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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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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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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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