Contrast sensitivity of pattern transient VEP components: contribution from M and P pathways

Detalhes bibliográficos
Autor(a) principal: SOUZA, Givago da Silva
Data de Publicação: 2013
Outros Autores: GOMES, Bruno Duarte, LACERDA, Eliza Maria da Costa Brito, SAITO, Cézar Akiyoshi, SILVA FILHO, Manoel da, SILVEIRA, Luiz Carlos de Lima
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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spelling 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
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dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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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>.
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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
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