Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFPA |
Texto Completo: | http://repositorio.ufpa.br/jspui/handle/2011/5182 |
Resumo: | The purpose of this study was to compare contrast sensitivity estimated from transient visual evoked potentials (VEPs) elicited by achromatic pattern-reversal and pattern-onset/offset modes. The stimuli were 2-cpd, achromatic horizontal gratings presented either as a 1 Hz pattern reversal or a 300 ms onset/700 ms offset stimulus. Contrast thresholds were estimated by linear regression to amplitudes of VEP components vs. the logarithm of the stimulus contrasts, and these regressions were extrapolated to the zero amplitude level. Contrast sensitivity was defined as the inverse of contrast threshold. For pattern reversal, the relation between the P100 amplitude and log of the stimulus contrast was best described by two separate linear regressions. For the N135 component, a single straight line was sufficient. In the case of pattern onset/offset for both the C1 and C2 components, single straight lines described their amplitude vs. log contrast relations in the medium-to-low contrast range. Some saturation was observed for C2 components. The contrast sensitivity estimated from the low-contrast limb of the P100, from the N135, and from the C2 were all similar but higher than those obtained from the high-contrast limb of the P100 and C1 data, which were also similar to each other. With 2 cpd stimuli, a mechanism possibly driven by the M pathway appeared to contribute to the P100 component at medium-to-low contrasts and to the N135 and C2 components at all contrast levels, whereas another mechanism, possibly driven by the P and M pathways, appeared to contribute to the P100 component at high contrast and C1 component at all contrast levels. |
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2014-06-30T12:59:55Z2014-06-30T12:59:55Z2013-12SOUZA, Givago S. et al. Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways. Psychology & Neuroscience, Rio de Janeiro, v. 6, n. 2, p. 191-198, jul./dez. 2013. Disponível em: <http://www.scielo.br/pdf/pn/v6n2/v6n2a07.pdf>. Acesso em: 12 fev. 2014. <http://dx.doi.org/10.3922/j.psns.2013.2.07>.1983-3288http://repositorio.ufpa.br/jspui/handle/2011/5182The purpose of this study was to compare contrast sensitivity estimated from transient visual evoked potentials (VEPs) elicited by achromatic pattern-reversal and pattern-onset/offset modes. The stimuli were 2-cpd, achromatic horizontal gratings presented either as a 1 Hz pattern reversal or a 300 ms onset/700 ms offset stimulus. Contrast thresholds were estimated by linear regression to amplitudes of VEP components vs. the logarithm of the stimulus contrasts, and these regressions were extrapolated to the zero amplitude level. Contrast sensitivity was defined as the inverse of contrast threshold. For pattern reversal, the relation between the P100 amplitude and log of the stimulus contrast was best described by two separate linear regressions. For the N135 component, a single straight line was sufficient. In the case of pattern onset/offset for both the C1 and C2 components, single straight lines described their amplitude vs. log contrast relations in the medium-to-low contrast range. Some saturation was observed for C2 components. The contrast sensitivity estimated from the low-contrast limb of the P100, from the N135, and from the C2 were all similar but higher than those obtained from the high-contrast limb of the P100 and C1 data, which were also similar to each other. With 2 cpd stimuli, a mechanism possibly driven by the M pathway appeared to contribute to the P100 component at medium-to-low contrasts and to the N135 and C2 components at all contrast levels, whereas another mechanism, possibly driven by the P and M pathways, appeared to contribute to the P100 component at high contrast and C1 component at all contrast levels.engSensibilidade ao contrasteVisão espacialVias visuais paralelasVEPContrast sensitivity of pattern transient VEP components: contribution from M and P pathwaysinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleSOUZA, Givago da SilvaGOMES, Bruno DuarteLACERDA, Eliza Maria da Costa BritoSAITO, Cézar AkiyoshiSILVA FILHO, Manoel daSILVEIRA, Luiz Carlos de Limainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFPAinstname:Universidade Federal do Pará (UFPA)instacron:UFPAORIGINALArtigo_ContrastSensitivityPattern.pdfArtigo_ContrastSensitivityPattern.pdfapplication/pdf1244283http://repositorio.ufpa.br/oai/bitstream/2011/5182/1/Artigo_ContrastSensitivityPattern.pdfab1a9967ac099363626e10a19d662b76MD51CC-LICENSElicense_urllicense_urltext/plain; charset=utf-849http://repositorio.ufpa.br/oai/bitstream/2011/5182/2/license_url4afdbb8c545fd630ea7db775da747b2fMD52license_textlicense_texttext/html; charset=utf-821936http://repositorio.ufpa.br/oai/bitstream/2011/5182/3/license_text9833653f73f7853880c94a6fead477b1MD53license_rdflicense_rdfapplication/rdf+xml; charset=utf-823148http://repositorio.ufpa.br/oai/bitstream/2011/5182/4/license_rdf9da0b6dfac957114c6a7714714b86306MD54LICENSElicense.txtlicense.txttext/plain; charset=utf-81775http://repositorio.ufpa.br/oai/bitstream/2011/5182/5/license.txta930293e49ae6e6b5c49a341d4a36286MD55TEXTArtigo_ContrastSensitivityPattern.pdf.txtArtigo_ContrastSensitivityPattern.pdf.txtExtracted texttext/plain36007http://repositorio.ufpa.br/oai/bitstream/2011/5182/6/Artigo_ContrastSensitivityPattern.pdf.txtb17bf086b73cecc68308812f34a37d21MD562011/51822017-10-17 08:46:23.72oai:repositorio.ufpa.br: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Repositório InstitucionalPUBhttp://repositorio.ufpa.br/oai/requestriufpabc@ufpa.bropendoar:21232017-10-17T11:46:23Repositório Institucional da UFPA - Universidade Federal do Pará (UFPA)false |
dc.title.pt_BR.fl_str_mv |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
title |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
spellingShingle |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways SOUZA, Givago da Silva Sensibilidade ao contraste Visão espacial Vias visuais paralelas VEP |
title_short |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
title_full |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
title_fullStr |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
title_full_unstemmed |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
title_sort |
Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways |
author |
SOUZA, Givago da Silva |
author_facet |
SOUZA, Givago da Silva GOMES, Bruno Duarte LACERDA, Eliza Maria da Costa Brito SAITO, Cézar Akiyoshi SILVA FILHO, Manoel da SILVEIRA, Luiz Carlos de Lima |
author_role |
author |
author2 |
GOMES, Bruno Duarte LACERDA, Eliza Maria da Costa Brito SAITO, Cézar Akiyoshi SILVA FILHO, Manoel da SILVEIRA, Luiz Carlos de Lima |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
SOUZA, Givago da Silva GOMES, Bruno Duarte LACERDA, Eliza Maria da Costa Brito SAITO, Cézar Akiyoshi SILVA FILHO, Manoel da SILVEIRA, Luiz Carlos de Lima |
dc.subject.por.fl_str_mv |
Sensibilidade ao contraste Visão espacial Vias visuais paralelas VEP |
topic |
Sensibilidade ao contraste Visão espacial Vias visuais paralelas VEP |
description |
The purpose of this study was to compare contrast sensitivity estimated from transient visual evoked potentials (VEPs) elicited by achromatic pattern-reversal and pattern-onset/offset modes. The stimuli were 2-cpd, achromatic horizontal gratings presented either as a 1 Hz pattern reversal or a 300 ms onset/700 ms offset stimulus. Contrast thresholds were estimated by linear regression to amplitudes of VEP components vs. the logarithm of the stimulus contrasts, and these regressions were extrapolated to the zero amplitude level. Contrast sensitivity was defined as the inverse of contrast threshold. For pattern reversal, the relation between the P100 amplitude and log of the stimulus contrast was best described by two separate linear regressions. For the N135 component, a single straight line was sufficient. In the case of pattern onset/offset for both the C1 and C2 components, single straight lines described their amplitude vs. log contrast relations in the medium-to-low contrast range. Some saturation was observed for C2 components. The contrast sensitivity estimated from the low-contrast limb of the P100, from the N135, and from the C2 were all similar but higher than those obtained from the high-contrast limb of the P100 and C1 data, which were also similar to each other. With 2 cpd stimuli, a mechanism possibly driven by the M pathway appeared to contribute to the P100 component at medium-to-low contrasts and to the N135 and C2 components at all contrast levels, whereas another mechanism, possibly driven by the P and M pathways, appeared to contribute to the P100 component at high contrast and C1 component at all contrast levels. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-12 |
dc.date.accessioned.fl_str_mv |
2014-06-30T12:59:55Z |
dc.date.available.fl_str_mv |
2014-06-30T12:59:55Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SOUZA, Givago S. et al. Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways. Psychology & Neuroscience, Rio de Janeiro, v. 6, n. 2, p. 191-198, jul./dez. 2013. Disponível em: <http://www.scielo.br/pdf/pn/v6n2/v6n2a07.pdf>. Acesso em: 12 fev. 2014. <http://dx.doi.org/10.3922/j.psns.2013.2.07>. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufpa.br/jspui/handle/2011/5182 |
dc.identifier.issn.none.fl_str_mv |
1983-3288 |
identifier_str_mv |
SOUZA, Givago S. et al. Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways. Psychology & Neuroscience, Rio de Janeiro, v. 6, n. 2, p. 191-198, jul./dez. 2013. Disponível em: <http://www.scielo.br/pdf/pn/v6n2/v6n2a07.pdf>. Acesso em: 12 fev. 2014. <http://dx.doi.org/10.3922/j.psns.2013.2.07>. 1983-3288 |
url |
http://repositorio.ufpa.br/jspui/handle/2011/5182 |
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eng |
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eng |
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openAccess |
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