Os efeitos da idade na percepção visual de grades senoidais em luminância baixa

O objetivo deste trabalho foi investigar a função de sensibilidade ao contraste (FSC) de adultos e idosos (20-23, 30-39, 40-49, 50-59, 60-69 anos) para grades senoidais de 0,25 a 2 cpg em luminância baixa. Todos os participantes apresentavam acuidade visual normal e se encontravam livres de doenças...

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Published inPsicologia, reflexão e crítica Vol. 19; no. 3; pp. 415 - 421
Main Authors Santos, Natanael Antonio dos, Oliveira, Adriana Bastos, Nogueira, Renata Maria Toscano Barreto Lyra, Cruz, Éllen Dias Nicácio da, Simas, Maria Lúcia de Bustamante
Format Journal Article
LanguagePortuguese
Published Curso de Pós-Graduação em Psicologia da Universidade Federal do Rio Grande do Sul 2006
Subjects
PHYSICS, MULTIDISCIPLINARY
sensibilidade ao contraste
freqüência espacial
forced-choice staircase method
envelhecimento
método da escolha forçada
aging
spatial frequency
Percepção visual
contrast sensitivity
Visual perception
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Abstract O objetivo deste trabalho foi investigar a função de sensibilidade ao contraste (FSC) de adultos e idosos (20-23, 30-39, 40-49, 50-59, 60-69 anos) para grades senoidais de 0,25 a 2 cpg em luminância baixa. Todos os participantes apresentavam acuidade visual normal e se encontravam livres de doenças oculares identificáveis. Foram estimados limiares de contraste para 30 participantes (seis em cada faixa etária) utilizando o método psicofísico da escolha forçada. Neste método, os participantes tinham que escolher um estímulo contendo uma freqüência de teste (grade senoidal) em baixo contraste ou um estímulo neutro com luminância média de 0,7 cd/m². Os resultados mostraram que os grupos de 50-59 e 60-69 anos apresentaram prejuízos significativos na FSC nas freqüências espaciais de 1 e 2 cpg comparados ao grupo de 20-23 anos. Estes resultados sugerem alterações relacionadas à idade na FSC de freqüências espaciais em níveis baixos de luminância.
AbstractList O objetivo deste trabalho foi investigar a função de sensibilidade ao contraste (FSC) de adultos e idosos (20-23, 30-39, 40-49, 50-59, 60-69 anos) para grades senoidais de 0,25 a 2 cpg em luminância baixa. Todos os participantes apresentavam acuidade visual normal e se encontravam livres de doenças oculares identificáveis. Foram estimados limiares de contraste para 30 participantes (seis em cada faixa etária) utilizando o método psicofísico da escolha forçada. Neste método, os participantes tinham que escolher um estímulo contendo uma freqüência de teste (grade senoidal) em baixo contraste ou um estímulo neutro com luminância média de 0,7 cd/m². Os resultados mostraram que os grupos de 50-59 e 60-69 anos apresentaram prejuízos significativos na FSC nas freqüências espaciais de 1 e 2 cpg comparados ao grupo de 20-23 anos. Estes resultados sugerem alterações relacionadas à idade na FSC de freqüências espaciais em níveis baixos de luminância.
Author Simas, Maria Lúcia de Bustamante
Cruz, Éllen Dias Nicácio da
Oliveira, Adriana Bastos
Santos, Natanael Antonio dos
Nogueira, Renata Maria Toscano Barreto Lyra
AuthorAffiliation Universidade Federal da Paraíba
Universidade Federal de Pernambuco
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  givenname: Natanael Antonio dos
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  givenname: Adriana Bastos
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  fullname: Simas, Maria Lúcia de Bustamante
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Issue 3
Keywords sensibilidade ao contraste
freqüência espacial
forced-choice staircase method
envelhecimento
método da escolha forçada
aging
spatial frequency
Percepção visual
contrast sensitivity
Visual perception
Language Portuguese
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Snippet O objetivo deste trabalho foi investigar a função de sensibilidade ao contraste (FSC) de adultos e idosos (20-23, 30-39, 40-49, 50-59, 60-69 anos) para grades...
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SubjectTerms PHYSICS, MULTIDISCIPLINARY
Title Os efeitos da idade na percepção visual de grades senoidais em luminância baixa
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