The pattern-pulse multifocal visual evoked potential
Identifieur interne : 00B010 ( Main/Exploration ); précédent : 00B009; suivant : 00B011The pattern-pulse multifocal visual evoked potential
Auteurs : Andrew Charles James [France, Australie]Source :
- Investigative ophthalmology & visual science [ 0146-0404 ] ; 2003.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme.
English descriptors
- KwdEn :
Abstract
PURPOSE. To define the pattern-pulse multifocal visual evoked potential (PPMVEP) and determine its characteristics in a sample of normal subjects in terms of amplitude of response attainable, the variation in waveform across visual field, and distribution of potential over the scalp and to compare pattern-pulse with contrast-reversal multifocal stimuli. Moons. VEPs were obtained by concurrently stimulating 60 regions of a cortically scaled dartboard with pulses of pattern contrast. Responses were recorded from normal subjects, by using a 32-channel electroencephalogram recording system, and elementary responses to each region were estimated by multiple regression of each of the response channel signals on stimulus signals. Left-eye, right-eye, and binocular viewing conditions were concurrently tested by dichoptic stimulation. A direct comparison was then made with contrast-reversal stimulation. RESULTS. Response waveform sets for 12 subjects varied in maximum amplitude from 1.8 to 6.8 μV. A stereotypical distribution of waveforms held in most subjects, depending primarily on the polar angle location of the stimulus within the visual field. In a direct comparison with a contrast-reversal multifocal analysis, the pattern-pulse responses had similar waveforms and scalp topography, but were 15 times larger in amplitude. Root mean square (RMS) signal-to-noise ratio (SNR) was 1.9 times higher with pattern-pulse stimulation, corresponding to a reduction of 73% in recording time to achieve the same SNR. CONCLUSIONS. The PPMVEP can simultaneously characterize 60 regions of the visual field for both eyes in less than 7 minutes. A general methodology is illustrated that allows multifocal analysis with flexible choice of stimulus conditions.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">The pattern-pulse multifocal visual evoked potential</title><author><name sortKey="James, Andrew Charles" sort="James, Andrew Charles" uniqKey="James A" first="Andrew Charles" last="James">Andrew Charles James</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Center for Brain and Cognition Research, Unit 5549, National Center for Scientific Research (CNRS) and Paul Sabatier University</s1><s2>Toulouse</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Centre for Visual Sciences, Research School of Biological Sciences, Australian National University</s1><s2>Canberra</s2><s3>AUS</s3><sZ>1 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Canberra</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">03-0154953</idno><date when="2003">2003</date><idno type="stanalyst">PASCAL 03-0154953 INIST</idno><idno type="RBID">Pascal:03-0154953</idno><idno type="wicri:Area/PascalFrancis/Corpus">005427</idno><idno type="wicri:Area/PascalFrancis/Curation">000C99</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">004D67</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">004D67</idno><idno type="wicri:doubleKey">0146-0404:2003:James A:the:pattern:pulse</idno><idno type="wicri:Area/Main/Merge">00BD52</idno><idno type="wicri:Area/Main/Curation">00B010</idno><idno type="wicri:Area/Main/Exploration">00B010</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">The pattern-pulse multifocal visual evoked potential</title><author><name sortKey="James, Andrew Charles" sort="James, Andrew Charles" uniqKey="James A" first="Andrew Charles" last="James">Andrew Charles James</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Center for Brain and Cognition Research, Unit 5549, National Center for Scientific Research (CNRS) and Paul Sabatier University</s1><s2>Toulouse</s2><s3>FRA</s3><sZ>1 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Occitanie (région administrative)</region><region type="old region">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Centre for Visual Sciences, Research School of Biological Sciences, Australian National University</s1><s2>Canberra</s2><s3>AUS</s3><sZ>1 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Canberra</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Investigative ophthalmology & visual science</title><title level="j" type="abbreviated">Invest. ophthalmol. vis. sci.</title><idno type="ISSN">0146-0404</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Investigative ophthalmology & visual science</title><title level="j" type="abbreviated">Invest. ophthalmol. vis. sci.</title><idno type="ISSN">0146-0404</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Exploration</term><term>Healthy subject</term><term>Human</term><term>Pattern analysis</term><term>Pulse analyzer</term><term>Visual evoked potential</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Potentiel évoqué visuel</term><term>Exploration</term><term>Analyseur impulsion</term><term>Analyse forme</term><term>Homme</term><term>Individu sain</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Homme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">PURPOSE. To define the pattern-pulse multifocal visual evoked potential (PPMVEP) and determine its characteristics in a sample of normal subjects in terms of amplitude of response attainable, the variation in waveform across visual field, and distribution of potential over the scalp and to compare pattern-pulse with contrast-reversal multifocal stimuli. Moons. VEPs were obtained by concurrently stimulating 60 regions of a cortically scaled dartboard with pulses of pattern contrast. Responses were recorded from normal subjects, by using a 32-channel electroencephalogram recording system, and elementary responses to each region were estimated by multiple regression of each of the response channel signals on stimulus signals. Left-eye, right-eye, and binocular viewing conditions were concurrently tested by dichoptic stimulation. A direct comparison was then made with contrast-reversal stimulation. RESULTS. Response waveform sets for 12 subjects varied in maximum amplitude from 1.8 to 6.8 μV. A stereotypical distribution of waveforms held in most subjects, depending primarily on the polar angle location of the stimulus within the visual field. In a direct comparison with a contrast-reversal multifocal analysis, the pattern-pulse responses had similar waveforms and scalp topography, but were 15 times larger in amplitude. Root mean square (RMS) signal-to-noise ratio (SNR) was 1.9 times higher with pattern-pulse stimulation, corresponding to a reduction of 73% in recording time to achieve the same SNR. CONCLUSIONS. The PPMVEP can simultaneously characterize 60 regions of the visual field for both eyes in less than 7 minutes. A general methodology is illustrated that allows multifocal analysis with flexible choice of stimulus conditions.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Toulouse</li></settlement></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="James, Andrew Charles" sort="James, Andrew Charles" uniqKey="James A" first="Andrew Charles" last="James">Andrew Charles James</name></region></country><country name="Australie"><noRegion><name sortKey="James, Andrew Charles" sort="James, Andrew Charles" uniqKey="James A" first="Andrew Charles" last="James">Andrew Charles James</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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