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Tesi sul tema "Visual evoked response"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 28 luglio 2024

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1

O’Toole, Dennis Michael. "Removal of ocular artifact from visual evoked response recordings." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25502.

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Abstract (sommario):

Potentials generated by the eye cause unwanted artifact in Visual Evoked Response (VER) recordings. These artifacts often contaminate the data in a systematic way that can lead to spurious experimental results. Although it is widely agreed that ocular artifact must be accounted for, the methods used to deal with this problem are varied. The present study compared four methods used to control ocular artifact; blink rejection, eyes closed, subtraction and regression. Twenty normal, female subjects were tested twice within the same session. Subjects watched light flashes of 4 intensities; 2, 30,

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2

Rudduck, Gillian A. "The chromatic visual evoked response as an indication of visual development." Thesis, Aston University, 1993. http://publications.aston.ac.uk/14607/.

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In an endeavour to provide further insight into the maturation of the cortical visual system in human infants, chromatic transient pattern reversal visual evoked potentials to red/green stimuli, were studied in a group of normal full term infants between the ages of 1 and 14 weeks post term in both cross sectional and longitudinal studies. In order to produce stimuli in which luminance cues had been eliminated with an aim to eliciting a chromatic response, preliminary studies of isoluminance determination in adults and infants were undertaken using behavioural and electrophysiological techniqu

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3

Hobley, Angela J. "The investigation of the primary response of the flash visual evoked response." Thesis, Aston University, 1988. http://publications.aston.ac.uk/14616/.

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Abstract (sommario):

The topographical distribution of the early components of the flash visual evoked response (VER) were investigated using a twenty channel brain mapping system. Thirty subjects, ranging in age from 21 to 84 years, had flash VERs recorded using the standard 10-20 electrode system to a balanced non-cephalic reference. The subjects were divided into three age groups: a young group, a middle group and an older group. The P2 component (positive component around 100-120 msec) of the flash VER was recorded consistently over the occipital region throughout the age range, as was a frontal negative compo

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4

Simpson, David Gordon Giles, and dsimpson@swin edu au. "Instrumentation for high spatial resolution of steady state visual evoked potentials." Swinburne University of Technology, 1998. http://adt.lib.swin.edu.au./public/adt-VSWT20060711.123100.

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This thesis reports on several new and innovative instrumentation developments to solve some of the problems of brain activity monitoring, particularly SSVEP (Steady State Visual Evoked Potentials) studies. SSVEP systems generate suitable stimuli and record the resulting brain biopotentials from scalp electrodes. The instrumentation is configured as a 'Neuropsychiatric Workstation', supporting up to 136 scalp electrodes. Operating in the SSVEP mode, the Neuropsychiatric Workstation reported here significantly improves upon the previously reported spatial resolution and accuracy of maps related

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5

Lloyd, Robyn School of Optometry &amp Visual Science UNSW. "Achromatic and chromatic VEPs in adults with down syndrome." Awarded by:University of New South Wales. School of Optometry and Visual Science, 2005. http://handle.unsw.edu.au/1959.4/23957.

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Previous studies have found that spatial processing in children and adults with Down syndrome is different in comparison to the normal population. Some previous studies have also found that there is a high prevalence of colour vision deficiencies in people with Down syndrome. The aim of the present study was to use an objective test, the transient visual evoked potential (VEP), to assess achromatic and chromatic visual processing in adults with Down syndrome. Achromatic VEPs were recorded in response to black-white stimuli presented in patternreversal mode. Chromatic VEPs were recorded in resp

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6

De, Faria Newton. "A non-invasive visual evoked cortical potential test for detection of early glaucoma damage /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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7

Stevens, Jean-Luc Richard. "Spatiotemporal properties of evoked neural response in the primary visual cortex." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31330.

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Understanding how neurons in the primary visual cortex (V1) of primates respond to visual patterns has been a major focus of research in neuroscience for many decades. Numerous different experimental techniques have been used to provide data about how the spatiotemporal patterns of light projected from the visual environment onto the retina relate to the spatiotemporal patterns of neural activity evoked in the visual cortex, across disparate spatial and temporal scales. However, despite the variety of data sources available (or perhaps because of it), there is still no unified explanation for

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8

Jones, Keith Shawn. "AN EVALUATION OF A STEADY-STATE VISUAL EVOKED RESPONSE-BASED CONTROL." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971880840.

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9

Lai, Sui-man, and 賴萃文. "Design of a time-encoded visual stimulation method for brain computer interface based on chromatic transient visual evoked potentials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085829.

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10

Lai, Sui-man. "Design of a time-encoded visual stimulation method for brain computer interface based on chromatic transient visual evoked potentials." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43085829.

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11

Highsmith, Jennifer Rea. "Changes in chromatic pattern-onset VEP with full-body inversion." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1446433.

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12

Nesfield, Catheryn J. "The effect of stimulus location on the major components of the visual evoked response." Thesis, Aston University, 1992. http://publications.aston.ac.uk/14629/.

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Abstract (sommario):

The topographical distribution of the pattern reversal Visual Evoked Response (VER) was recorded from a localised montage of 20 electrodes over the visual cortex. The response was recorded after stimulation with a black and white checkerboard stimulus. The effect of field location on the major components was investigated in 11 subjects (age range (23-55). The major components of the half field response were; a negative around 75ms (N75) followed by a positivity around 80ms (P80), then a positivity around 100ms (P100) followed by another positivity at around 120ms (P120) and a negativity at app

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13

Schenk, Eric R. "Detection of specific steady-state visual evoked potentials when multiple frequencies are available for stimulation." Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176401258.

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14

Evans, Jennifer Anne. "Changing the shape of circadian rhythms with light no brighter than moonlight." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3258782.

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Abstract (sommario):

Thesis (Ph. D.)--University of California, San Diego, 2007.<br>Title from first page of PDF file (viewed June 8, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 169-188).

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15

Baud-Bovy, Gabriel. "A gaze-addressing communication system using artificial neural networks." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4258.

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Abstract (sommario):

Severe motor disabilities can render a person almost completely incapable of communication. Nevertheless, in many cases, the sensory systems are intact and the eye movements are still under good control. In these cases, one can use a device such as the Brain Response Interface (BRI) to command a remote control (e.g. room temperature, bed position), a word-processor, a speech synthesizer, and so on.

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16

Nuttall, Rachel Corinne [Verfasser], Christian [Akademischer Betreuer] Sorg, Afra [Gutachter] Wohlschläger, and Markus [Gutachter] Ploner. "Evoked response variability across alpha oscillatory sources to visual flicker stimulation: An investigation in humans using electrophysiological and blood-oxygenation recordings / Rachel Corinne Nuttall ; Gutachter: Afra Wohlschläger, Markus Ploner ; Betreuer: Christian Sorg." München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/1228073260/34.

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17

Clay, Gary Robert. "Integrated scenic modeling of environmentally induced color changes in a coniferous forest canopy." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187420.

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Abstract (sommario):

The relationship between the changes in color values of scenic landscapes, and the corresponding shifts in viewers' preferences to those changed environments, was the focus of the presented research. Color modifications, either natural or based on some human intervention, provide visual clues that an environment has undergone some transformation. These color changes can occur at both the micro and macro scale, can having temporal dimensions, and can be a result of combinations of both physical landscape change, and shifts in an observer's perspective with respect to that landscape. The researc

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18

Fassnidge, Christopher. "The visually-evoked auditory response." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/19689/.

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In synaesthesia a sensation in one modality triggers a consciously perceived sensation in another sensory modality or cognitive domain. In this thesis we investigate auditory sensation that are induced by dynamic visual stimuli, akin to hearing-motion synaesthesia (Saenz and Koch, 2008). We term this the Visually-Evoked Auditory Response (vEAR). We first establish the prevalence of vEAR in a random sample, with questionnaire responses indicating a higher prevalence (as many as 1 in 5) than canonical synaesthesias. We report that those who experience vEAR showed better performance compared to c

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19

Wen, Yaqin. "Spatial and temporal characteristics of multifocal visual evoked responses." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432031.

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20

Dixon, Thomas Oliver. "An electrophysiological examination of visuomotor activity elicited by visual object affordances." Thesis, University of Plymouth, 2016. http://hdl.handle.net/10026.1/6758.

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Abstract (sommario):

A wide literature of predominantly behavioural experiments that use Stimulus 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 literature by applying electrophysiological measures to well established SRC procedures to determine the verities of the behavioural claims of rapid and automatic visuomotor activation evoked by viewing affording objects. Th

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21

Huang, Bao-Quey. "Visually evoked startle response in the cod (Gadhus Morhua)." Thesis, University of Aberdeen, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.331943.

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22

Slaven, Antoinette. "Visual evoked magnetic responses (VEMR) to flash and pattern reversal stimulation." Thesis, Aston University, 1992. http://publications.aston.ac.uk/14634/.

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The problems of using a single channel magnetometer (BTi, Model 601) in an unshielded clinical environment to measure visual evoked magnetic responses (VEMR) were studied. VEMR to flash and pattern reversal stimuli were measured in 100 normal subjects. Two components, the P100M to pattern reversal and P2M to flash, were measured successfully in the majority of patients. The mean latencies of these components in different decades of life were more variable than the visual evoked potentials (VEP) that have been recorded these stimuli. The latency of the P100M appeared to increase significantly a

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23

Degg, Christopher. "The visually evoked magnetic response (VEMR) to a pattern onset/offset stimulus." Thesis, Aston University, 1993. http://publications.aston.ac.uk/14608/.

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Abstract (sommario):

This study characterizes the visually evoked magnetic response (VEMR) to pattern onset/offset stimuli, using a single channel BTi magnetometer. The influence of stimulus parameters and recording protocols on the VEMR is studied with inferences drawn about the nature of cortical processing, its origins and optimal recording strategies. Fundamental characteristics are examined, such as the behaviour of successive averaged and unaveraged responses; the effects of environmental shielding; averaging; inter- and intrasubject variability and equipment specificity. The effects of varying check size, f

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24

Suttle, Catherine M. "Development of visual evoked responses to tritan,red-green and luminance stimuli in human infants." Thesis, Aston University, 1997. http://publications.aston.ac.uk/14649/.

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The principal aim of this work was to investigate the development of the S-cone colour-opponent pathway in human infants aged 4 weeks to 6 months. This was achieved by recording transient visual evoked responses to pattern-onset stimuli along a tritanopic confusion axis (tritan stimuli) at and around the adult isoluminant match. For comparison, visual evoked responses to red-green and luminance-modulated stimuli were recorded from the same infants at the same ages. The transient VEP allowed observation of response morphology as luminance differences were introduced to the chromatic stimuli. In

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25

Hashimoto, Tadashi. "Temporal profile of visual evoked responses to pattern reversal stimulation analyzed with whole-head magnetometer." Kyoto University, 1999. http://hdl.handle.net/2433/181243.

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26

Robertson, Anthony William Carleton University Dissertation Psychology. "Spatial pattern visually-evoked responses recorded from the mid-temporal scalp region of humans." Ottawa, 1985.

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27

Guhr, Susanne. "Visuell evozierte Flussgeschwindigkeitänderungen in der A. cerebri posterior bei Normalprobanden und Patienten mit Leitungsverzögerungen im Sehbahnbereich." Doctoral thesis, Humboldt-Universität zu Berlin, Medizinische Fakultät - Universitätsklinikum Charité, 2002. http://dx.doi.org/10.18452/14779.

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Abstract (sommario):

In der vorliegenden Arbeit werden am Beispiel visuell evozierter Flussgeschwindigkeitsänderungen die Anpassung der zerebralen Hämodynamik an Änderungen der Gehirnaktivität untersucht. Dazu wurde das nichtinvasive Verfahren der transkraniellen Dopplersonographie angewendet. Ziele der Arbeit waren das Erstellen von Normwerten der Latenzen und Amplituden visuell evozierter Geschwindigkeitsänderungen an einer Gruppe von Normalprobanden sowie die Prüfung der Sensitivität der zeitlichen Auflösung dieses Verfahrens. Die Untersuchungen wurden an einer Gruppe von 20 Normalprobanden und an einer Grupp

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28

Chung-Yi, Tsai, and 蔡鐘毅. "Color Response analysis by EEG and Visual Evoked Potential." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/51180691131319959968.

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碩士<br>亞洲大學<br>數位媒體設計學系碩士班<br>99<br>The color, shape and size are main factors to people to define an object in daily life.The color of an object depends on both the physics of the object in its environment and the characteristics of the perceiving eye and brain. The colors result from neural responses in human’s visual neural systems, whose process and activities can be understood through human electroencephalogram (EEG). In terms of patterns, human perception of colors is influenced by patterns and sizes; patterns, colors and sizes bear close relations and interact with each other. Therefore,

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29

Ramanna, Lakshmish. "Recording of cortical auditory evoked potentials on personal digital assistants /." 2008. http://proquest.umi.com/pqdweb?did=1654488281&sid=6&Fmt=2&clientId=10361&RQT=309&VName=PQD.

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30

Boon, Mei Ying Optometry &amp Vision Science Faculty of Science UNSW. "Maturation of the transient chromatic (L-M) visual evoked potential: insights from linear and nonlinear analysis." 2007. http://handle.unsw.edu.au/1959.4/40653.

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Abstract (sommario):

Introduction: Psychophysical and electrophysiological techniques have shown that chromatic contrast sensitivity improves between infancy and adolescence. In adults, electrophysiological and psychophysical methods usually agree. However, in infants electrophysiological techniques may underestimate ability to see chromatic contrast (Suttle et al., 2002). It is not known if the discrepancy between electrophysiological and psychophysical methods continues during childhood nor whether the chromatic VEP can be used as an indicator of colour perception in children. Purpose: To investigate the transi

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31

MacDonald, John J. "Crossmodal interactions in stimulus-driven spatial attention and inhibition of return: evidence from behavioural and electrophysiological measures." Thesis, 1999. http://hdl.handle.net/2429/10165.

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Ten experiments examined the interactions between vision and audition in stimulusdriven spatial attention orienting and inhibition of return (IOR). IOR is the demonstration that subjects are slower to respond to stimuli that are presented at a previously stimulated location. In each experiment, subjects made go/no-go responses to peripheral targets but not to central targets. On every trial, a target was preceded by a sensory event, called a "cue," either in the same modality (intramodal conditions) or in a different modality (crossmodal conditions). The cue did not predict the location

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32

Yovel, Galit. "Hemispheric asymmetry and interhemispheric communication in face perception /." 2001. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3029552.

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33

Ruseckaite, Rasa. "Investigation of normal vision and neuro-ophthalmic disorders using nonlinear systems identification methods." Phd thesis, 2004. http://hdl.handle.net/1885/148468.

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34

Leahan, K. E. "Photic stimulation and the treatment of mood and sleep disorders." Phd thesis, 2004. http://hdl.handle.net/1885/148546.

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35

McFarlane, Michelle. "Poor Glycemic Control is Associated with Neuroretinal Dysfunction in Short-wavelength Cone Pathways of Adolescents with Type 1 Diabetes." Thesis, 2010. http://hdl.handle.net/1807/25855.

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Abstract (sommario):

Studies demonstrate short-wavelength cone pathway dysfunction in patients with diabetes and no clinically visible DR. Poor glycemic control, as measured by hemoglobin A1c (HbA1c), is a strong risk factor for DR. We hypothesized that raised HbA1c was associated with short-wavelength cone sensitive visual evoked potential (S-VEP) and electroretinogram (sERG) dysfunction. Forty adolescents with diabetes and 39 controls were tested using the S-VEP. Latencies to a short-wavelength stimulus were delayed in patients at low contrasts. Patient S-VEP latencies were not associated with HbA1c when contr

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36

Li, Qing Quan, and 李清泉. "Visually evoked startle responses in the tigerperch (terapon jarbua)." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/76030197985483722931.

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