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.
Results
Showing 1 to 20 of 1020 for “"V1"”.
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Neural responses to relative motion in V1 and V2 of macaque monkeys
… and V2. We found that a substantial portion of V1 (62.2%) and V2 (70%) neurons respond to relative motion inputs. These neurons usually show V-shaped tuning curves to relative motion, with minimum response at zero relative motion. They respond predominantly to relative motion rather than to …
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Cat and monkey V1 neurons : comparison of the responses to sustained and transiently presented stimuli
… of neurons in the primary visual cortices (V1) of cats and monkeys have employed extended presentations of luminance modulated sinusoidal grating patterns or spatiotemporal noise (lasting on the order of several seconds) that are designed to obtain the steady-state response of the neurons. …
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Influence of the structure of the orientation preference map on the responses of V1 neurons
… majority of inputs to primary visual cortex (V1) neurons arise from the dense local projections of neighboring neurons. Although several proposals have been made, it is not known what role these connections play in shaping the response properties of V1 neurons. It was reasoned that the …
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PRESERVED GRIP SCALING TO UNSEEN OBJECTS FOLLOWING A UNILATERAL LESION TO V1 FOR IMMEDIATE BUT NOT DELAYED GRASPING
Patients with damage to V1 can sometimes direct actions towards ‘unseen’ targets located in areas of the visual field that are deemed ‘blind’ on the basis of static perimetry tests. Here, we show that a patient with a complete right homonymous hemianopia after a V1 lesion remains sensitive to the …
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GENERAL STRENGTH AND MUSCULAR ENDURANCE: RELATIONSHIP TO V1- AND V2-SKATE SKIING ECONOMY IN COLLEGIATE CROSS-COUNTRY SKIERS
… to VO<sub>2</sub> skiing economy utilizing the V1- and V2-skate technique.<strong> </strong></p> <p><strong>Methods </strong>Oxygen uptake was measured during baseline and economy testing on a specialized skiing treadmill. A paired samples t-test was utilized to determine differences between V1- …
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Innovation in low-cost video-laryngoscopy: Intubator V1-Indirect compared with Storz C-MAC in a simulated difficult airway
Background: Video laryngoscopy has directly impacted airway management, with numerous studies demonstrating its utility in clinical management of anatomically difficult airways. However, availability of video laryngoscopes in all clinical areas has been limited by cost. We used smartphone …
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Dynamic and Integrative Properties of the Primary Visual Cortex
… 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 connections, the …
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Top-Down Control of Lateral Interactions in Visual Cortex
<p>V1 neurons are capable 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 …
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The Role of Parvalbumin Interneurons in Mouse Primary Visual Cortex during Visual Discrimination and Perceptual Learning
… Wilson et al., 2012). The primary visual cortex (V1) has an early and a late phase of activity, likely reflecting bottom-up (feedforward) and integration of top-down (feedback) sensory processing (Lamme and Roelfsema, 2000; Wyatte et al., 2014). The feedforward sweep alone is sufficient to enable …
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Effects of Reticular Activation on Long-Term Depression in Primary Visual Cortex of the Long-Evans Rat
… activity in the primary visual cortex (V1) alter the effectiveness of LFS to induce LTD under in vivo conditions, using urethane anesthetized rats. LFS applied to the lateral geniculate nucleus resulted in LTD of field postsynaptic potentials (fPSPs) recorded in the primary visual cortex …
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Measurements of Malleable Visual Mechanisms Through High-resolution fMRI and Perceptual Learning
… and parvocellular pathways in human V1. This neuroimaging study used achromatic checkerboards with low spatial frequency and high temporal frequency to target the color-insensitive magnocellular pathway and chromatic checkerboards with higher spatial frequency and low temporal …
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Modeling shape representation in visual cortex area V4
… originating in primary visual cortex (V1), progressing through intermediate area V4, and ascending to inferotemporal cortex. The computational mechanisms that produce representations in intermediate area V4 have remained a mystery. In this thesis I show that the standard model, a …
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Sensorimotor transformation and information coding across cortex during perceptual decisions
… outputs? We investigated the roles of visual (V1), posterior parietal (PPC), and frontal motor (fMC) cortices of mice during a memory-guided visual decision task. Large-scale calcium imaging revealed that neurons in each area were heterogeneous and spanned all task epochs (stimulus, delay, …
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Highly Selective Attentional Modulation of Task-Appropriate Neural Populations in Primary Visual Cortex
… sub-populations of primary visual cortical (V1) neurons. In both experiments we observe that attentional modulations are grossly targeted to neural populations that are selectively tuned for the cue. When humans attend to one orientation, voxels reflecting orientation selective neurons tuned …
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Visual cortical plasticity : the role of parvalbumin expressing inhibitory neurons and abnormalities in models of neurodevelopmental disorders
… modification of primary visual cortex (V1) in adult mice: ocular dominance (OD) plasticity resulting from monocular deprivation and stimulus-selective response potentiation (SRP) resulting from supplemental visual experience. These two forms of plasticity are triggered by different …
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Non-invasive tuning of experience-dependent plasticity in the primary visual cortex
… development. In the mouse primary visual cortex (V1), ocular dominance plasticity (ODP) has served as a premier model for investigating the cellular and molecular mechanisms that underlie the formation and stabilization of cortical circuits. During the CP, short-term monocular deprivation (MD) …
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Impact of the American Diet on Newly-Arrived International Students during their first three months at Virginia Tech
… in average weight by 2.79 lbs from visit 1 (V1) to visit 3 (V3) (p=0.0082), Participants who gained weight (PGW; n=10) had an average increase by 9 lbs. Country wise, Chinese had a statistically significant average increase in their weights by 4.16 lbs (p=0.0077) whereas, Indians and Germans …
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Preliminary investigation of the temporal specificity of sequence learning in the primary visual cortex through predictive coding
The primary visual cortex (V1) has been classically viewed as an immutable feature detector, with robust responses to low-level characteristics of objects in the visual field. Recent studies have shown the capacity of this cortical area to perform more complex computations. Nominally, the …
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Educational Equity and the National Science Foundation Systemic Initiatives: A Field's -Eye -View of Local Stakeholder Understandings
… with Fairness (Vf) plus other local values (V1·· Vi) such as cultural ideals or local customs and is operationalized through ""equality as action"" (Ea). This combination creates the condition Equity (EQ). Es, Vf, and E a are necessary components that can be considered …
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