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 18 of 18 for “"; Visual evoked potentials"”.
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Steady-state visual evoked potentials and their application to brain-computer interfaces
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01
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A novel visual stimulation paradigm: exploiting individual primary visual cortex geometry to boost steady state visual evoked potentials (SSVEP)
<p>The steady-state visual evoked potential (SSVEP) is an electroencephalographic response to flickering stimuli generated in significant part by activity in primary visual cortex (V1). SSVEP signal-to-noise ratio is generally low for stimuli that are located in the visual periphery, at frequencies …
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An electrophysiological study of chromatic processing in the human visual system. Using visual evoked potentials and electroretinograms to study cortical and retinal contributions to human trichromatic vision.
… at the cortex level was examined using visual evoked potentials (VEPs). These responses were elicited by chromatic spot stimuli, which were manipulated in order to selectively activate the chromatic processing system. Chromatic processing at the retinal level was examined using the …
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ΜΕΛΕΤΗ ΤΩΝ ΟΠΤΙΚΩΝ ΠΡΟΚΛΗΤΩΝ ΔΥΝΑΜΙΚΩΝ ΣΤΙΣ ΑΜΦΙΒΛΗΣΤΡΟΕΙΔΟΠΑΘΕΙΕΣ
THE STUDY OF THE PATTERN REVERSAL VISUAL EVOKED POTENTIALS OF 44 PATIENTS WITH RETINOPATHIES, REVEALED THAT RETINAL DISEASES WHICH IS THE FIRST NEURON OF THE VISUAL PATHWAYS CAUSE DELAYED CONDUCTION VELOCITY OF THE P100.
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Towards improved visual stimulus discrimination in an SSVEP BCI
… 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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An Electrophysiological Examination of Visuomotor Activity Elicited by Visual Object Affordances
… Response Compatibility (SRC) have suggested that visual action information such as object affordance yields rapid and concurrent activation of visual and motor brain areas, but has rarely provided direct evidence for this proposition. This thesis examines some of the key claims from the affordance …
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The Development of Flash Visual Evoked Potential Techniques for the Diagnosis of Visual Disorders with Dense Opacities of the Optic Media
Visual evoked potentials (VEP)were recorded in a large normal population. Significant age differences were found, and the P2 component (latency 116 m.sec.) was the most consistent component of the VEP both between and within the individuals. The validity of the normal VEP criteria were tested in …
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Exercise-Induced Modulation of Early Visual Evoked Responses: Chromatic and Achromatic Pathways
… investigating exercise-induced modulations of visual responses have beenconstrained by (1) generalized stimuli that cannot distinguish global mechanisms from pathway- specific effects, (2) stimulus-directed tasks that may conflate exercise costs with attentional effects, and (3) traditional EEG …
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Top-down Modulation of the Chromatic VEP with Hypnotic Suggestion
AbstractVisual perception is composed of both bottom-up (stimulus driven) and top-down (feedback) processes. It has been demonstrated that directed spatial attention enhances processing of attended stimuli, inhibits non-attended stimuli, and increases baseline activity in portions of cortex …
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A pilot study toward the development of ERD and SSVEP based hybrid brain computer interface
… de-synchronisation (ERS) and steady-state visual evoked potentials (SSVEP). The aim of this project is to show the hBCI proposed works, to find where improvements can be made and to identify the synergies of SSVEP and ERD modalities. A duel task experiment was performed on 4 healthy …
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The Effect of SSRIs on Adult Human Visual Cortex Plasticity. Do SSRIs Affect learning?
… inhibitors (SSRIs) have been shown to enhance visual cortex plasticity in adult animals (Maya-Vetencourt, Sale et al. 2008). The aim of this study was to assess whether SSRIs increase visual cortex plasticity in humans. Methods: To test healthy visual plasticity, in the first experiment, …
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Revealing mnemonic representations of the body in the brain
… the encoding and memory maintenance of visually perceived body-related information. Chapter 1 reviews current accounts in the overall memory field. Secondly, it reviews evidence for the presence of a memory system to encode and maintain body-related information in working memory. Chapter …
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The effects of selective attention on chromatic processing; pattern-onset VEP responses
… behavioral studies show that attention improves visual processing. Studies of chromatic steady-state and pattern-reversal visual evoked potentials (VEPs) support this. Typically in these studies VEP stimuli are displayed at one spatial location while distracter stimuli are displayed at a …
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Systemic AAV-Mediated Gene Therapy Using Epo-R76E to Protect Retinal Ganglion Cells from Optic Nerve Injury and Disease
… rescue was accompanied by preservation of visual function as demonstrated by flash visual evoked potentials. The protection provided by EPO‑R76E was independent of IOP and did not cause a significant increase in hematocrit. This is the first example of a neuroprotective agent for glaucoma …
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The Effects of Altered Partial Pressures of Gas on Cognitive and Neural Function
… Chapter 5 <br/>explores neural oscillations and evoked responses with EEG. Hypoxia reduced Critical Flicker <br/>Fusion (CFF) thresholds and altered Visual Evoked Potentials (VEPs), while Hyperoxia <br/>generated smaller more transient changes in CFF and VEPs, with a specific reduced motor …
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The role of individual variation in auditory and visual processing: implications for mate choice
… many songbirds couple their songs with a visual display. I tested how preference functions (i.e., the function describing female preference across variation in male traits) and subsequent selection on male traits can be altered under four scenarios of varying multimodal signal content. To …
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Promoting and measuring remyelination and neuroprotection in clinical trials of people with multiple sclerosis
The most tractable strategy to delay or prevent the progressive phase of MS is to promote endogenous remyelination; doing so restores nerve conduction and prevents demyelinated axons from degenerating. The rate-limiting stage in this process is differentiation of oligodendrocyte progenitor cells …
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Visual Outcome Measures of Remyelination and Neuroprotection in Multiple Sclerosis
… effect in clinical trials of remyelination. The visual pathway has been identified as a promising target for the assessment of myelin and axon health. This is because it is often involved in the course of MS, recovery from inflammatory demyelination in the visual pathway is often incomplete, and …