Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli

Autores
Cormenzana Méndez, Iñaki; Martín, Andrés; Charmichael, Teaire L.; Jacob, Mellina M.; Lacerda, Eliza M. C. B.; Gomes, Bruno D.; Fitzgerald, Malinda E. C.; Ventura, Dora F.; Silveira, Luiz C. L.; O´donell, Beatriz Maria; Souza, Givago S.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Pseudoisochromatic stimuli have been widely used to evaluate color discrimination and to identify color vision deficits. Luminance noise is one of the stimulus parameters used to ensure that subject´s response is due to their ability to discriminate target stimulus from the background based solely on the hue between the colors that compose such stimuli. We studied the influence of contrast modulation of the stimulus luminance noise on threshold and reaction time color discrimination. We evaluated color discrimination thresholds using the Cambridge Color Test (CCT) at six different stimulus mean luminances. Each mean luminance condition was tested using two protocols: constant absolute difference between maximum and minimum luminance of the luminance noise (constant delta protocol, CDP), and constant contrast modulation of the luminance noise (constant contrast protocol, CCP). MacAdam ellipses were fitted to the color discrimination thresholds in the CIE 1976 color space to quantify the color discrimination ellipses at threshold level. The same CDP and CCP protocols were applied in the experiment measuring RTs at three levels of stimulus mean luminance. The color threshold measurements show that for the CDP, ellipse areas decreased as a function of the mean luminance and they were significantly larger at the two lowest mean luminances, 10 cd/m2 and 13 cd/m2, compared to the highest one, 25 cd/m2. For the CCP, the ellipses areas also decreased as a function of the mean luminance, but there was no significant difference between ellipses areas estimated at six stimulus mean luminances. The exponent of the decrease of ellipse areas as a function of stimulus mean luminance was steeper in the CDP than CCP. Further, reaction time increased linearly with the reciprocal of the length of the chromatic vectors varying along the four chromatic half-axes. It decreased as a function of stimulus mean luminance in the CDP but not in the CCP. The findings indicated that visual performance using pseudoisochromatic stimuli was dependent on the Weber´s contrast of the luminance noise. Low Weber´s contrast in the luminance noise is suggested to have a reduced effect on chromatic information and, hence, facilitate desegregation of the hue-defined target from the background.
Fil: Cormenzana Méndez, Iñaki. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; Argentina
Fil: Martín, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; Argentina
Fil: Charmichael, Teaire L.. Christian Brothers University; Estados Unidos
Fil: Jacob, Mellina M.. Universidade Federal do Pará; Brasil
Fil: Lacerda, Eliza M. C. B.. Universidade Federal do Pará; Brasil
Fil: Gomes, Bruno D.. Universidade Federal do Pará; Brasil
Fil: Fitzgerald, Malinda E. C.. Christian Brothers University; Estados Unidos. University of Tennessee; Estados Unidos
Fil: Ventura, Dora F.. Universidade de Sao Paulo; Brasil
Fil: Silveira, Luiz C. L.. Universidade do Ceuma; Brasil. Universidade Federal do Pará; Brasil
Fil: O´donell, Beatriz Maria. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; Argentina
Fil: Souza, Givago S.. Universidade Federal do Pará; Brasil
Materia
CAMBRIDGE COLOR TEST
COLOR DISCRIMINATION THRESHOLDS
COLOR VISION
COLOR-LUMINANCE INTERACTION
PSEUDOISOCHROMATIC STIMULUS
REACTION TIME
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/131653
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/131653
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuliCormenzana Méndez, IñakiMartín, AndrésCharmichael, Teaire L.Jacob, Mellina M.Lacerda, Eliza M. C. B.Gomes, Bruno D.Fitzgerald, Malinda E. C.Ventura, Dora F.Silveira, Luiz C. L.O´donell, Beatriz MariaSouza, Givago S.CAMBRIDGE COLOR TESTCOLOR DISCRIMINATION THRESHOLDSCOLOR VISIONCOLOR-LUMINANCE INTERACTIONPSEUDOISOCHROMATIC STIMULUSREACTION TIMEhttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1Pseudoisochromatic stimuli have been widely used to evaluate color discrimination and to identify color vision deficits. Luminance noise is one of the stimulus parameters used to ensure that subject´s response is due to their ability to discriminate target stimulus from the background based solely on the hue between the colors that compose such stimuli. We studied the influence of contrast modulation of the stimulus luminance noise on threshold and reaction time color discrimination. We evaluated color discrimination thresholds using the Cambridge Color Test (CCT) at six different stimulus mean luminances. Each mean luminance condition was tested using two protocols: constant absolute difference between maximum and minimum luminance of the luminance noise (constant delta protocol, CDP), and constant contrast modulation of the luminance noise (constant contrast protocol, CCP). MacAdam ellipses were fitted to the color discrimination thresholds in the CIE 1976 color space to quantify the color discrimination ellipses at threshold level. The same CDP and CCP protocols were applied in the experiment measuring RTs at three levels of stimulus mean luminance. The color threshold measurements show that for the CDP, ellipse areas decreased as a function of the mean luminance and they were significantly larger at the two lowest mean luminances, 10 cd/m2 and 13 cd/m2, compared to the highest one, 25 cd/m2. For the CCP, the ellipses areas also decreased as a function of the mean luminance, but there was no significant difference between ellipses areas estimated at six stimulus mean luminances. The exponent of the decrease of ellipse areas as a function of stimulus mean luminance was steeper in the CDP than CCP. Further, reaction time increased linearly with the reciprocal of the length of the chromatic vectors varying along the four chromatic half-axes. It decreased as a function of stimulus mean luminance in the CDP but not in the CCP. The findings indicated that visual performance using pseudoisochromatic stimuli was dependent on the Weber´s contrast of the luminance noise. Low Weber´s contrast in the luminance noise is suggested to have a reduced effect on chromatic information and, hence, facilitate desegregation of the hue-defined target from the background.Fil: Cormenzana Méndez, Iñaki. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; ArgentinaFil: Martín, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; ArgentinaFil: Charmichael, Teaire L.. Christian Brothers University; Estados UnidosFil: Jacob, Mellina M.. Universidade Federal do Pará; BrasilFil: Lacerda, Eliza M. C. B.. Universidade Federal do Pará; BrasilFil: Gomes, Bruno D.. Universidade Federal do Pará; BrasilFil: Fitzgerald, Malinda E. C.. Christian Brothers University; Estados Unidos. University of Tennessee; Estados UnidosFil: Ventura, Dora F.. Universidade de Sao Paulo; BrasilFil: Silveira, Luiz C. L.. Universidade do Ceuma; Brasil. Universidade Federal do Pará; BrasilFil: O´donell, Beatriz Maria. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; ArgentinaFil: Souza, Givago S.. Universidade Federal do Pará; BrasilFrontiers Research Foundation2016-07-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/131653Cormenzana Méndez, Iñaki; Martín, Andrés; Charmichael, Teaire L.; Jacob, Mellina M.; Lacerda, Eliza M. C. B.; et al.; Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli; Frontiers Research Foundation; Frontiers in Psychology; 7; 6-7-2016; 1-13; 10061664-10781664-1078CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3389/fpsyg.2016.01006info:eu-repo/semantics/altIdentifier/url/https://www.frontiersin.org/articles/10.3389/fpsyg.2016.01006info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:59:27Zoai:ri.conicet.gov.ar:11336/131653instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:59:28.067CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
title Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
spellingShingle Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
Cormenzana Méndez, Iñaki
CAMBRIDGE COLOR TEST
COLOR DISCRIMINATION THRESHOLDS
COLOR VISION
COLOR-LUMINANCE INTERACTION
PSEUDOISOCHROMATIC STIMULUS
REACTION TIME
title_short Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
title_full Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
title_fullStr Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
title_full_unstemmed Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
title_sort Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli
dc.creator.none.fl_str_mv Cormenzana Méndez, Iñaki
Martín, Andrés
Charmichael, Teaire L.
Jacob, Mellina M.
Lacerda, Eliza M. C. B.
Gomes, Bruno D.
Fitzgerald, Malinda E. C.
Ventura, Dora F.
Silveira, Luiz C. L.
O´donell, Beatriz Maria
Souza, Givago S.
author Cormenzana Méndez, Iñaki
author_facet Cormenzana Méndez, Iñaki
Martín, Andrés
Charmichael, Teaire L.
Jacob, Mellina M.
Lacerda, Eliza M. C. B.
Gomes, Bruno D.
Fitzgerald, Malinda E. C.
Ventura, Dora F.
Silveira, Luiz C. L.
O´donell, Beatriz Maria
Souza, Givago S.
author_role author
author2 Martín, Andrés
Charmichael, Teaire L.
Jacob, Mellina M.
Lacerda, Eliza M. C. B.
Gomes, Bruno D.
Fitzgerald, Malinda E. C.
Ventura, Dora F.
Silveira, Luiz C. L.
O´donell, Beatriz Maria
Souza, Givago S.
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv CAMBRIDGE COLOR TEST
COLOR DISCRIMINATION THRESHOLDS
COLOR VISION
COLOR-LUMINANCE INTERACTION
PSEUDOISOCHROMATIC STIMULUS
REACTION TIME
topic CAMBRIDGE COLOR TEST
COLOR DISCRIMINATION THRESHOLDS
COLOR VISION
COLOR-LUMINANCE INTERACTION
PSEUDOISOCHROMATIC STIMULUS
REACTION TIME
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Pseudoisochromatic stimuli have been widely used to evaluate color discrimination and to identify color vision deficits. Luminance noise is one of the stimulus parameters used to ensure that subject´s response is due to their ability to discriminate target stimulus from the background based solely on the hue between the colors that compose such stimuli. We studied the influence of contrast modulation of the stimulus luminance noise on threshold and reaction time color discrimination. We evaluated color discrimination thresholds using the Cambridge Color Test (CCT) at six different stimulus mean luminances. Each mean luminance condition was tested using two protocols: constant absolute difference between maximum and minimum luminance of the luminance noise (constant delta protocol, CDP), and constant contrast modulation of the luminance noise (constant contrast protocol, CCP). MacAdam ellipses were fitted to the color discrimination thresholds in the CIE 1976 color space to quantify the color discrimination ellipses at threshold level. The same CDP and CCP protocols were applied in the experiment measuring RTs at three levels of stimulus mean luminance. The color threshold measurements show that for the CDP, ellipse areas decreased as a function of the mean luminance and they were significantly larger at the two lowest mean luminances, 10 cd/m2 and 13 cd/m2, compared to the highest one, 25 cd/m2. For the CCP, the ellipses areas also decreased as a function of the mean luminance, but there was no significant difference between ellipses areas estimated at six stimulus mean luminances. The exponent of the decrease of ellipse areas as a function of stimulus mean luminance was steeper in the CDP than CCP. Further, reaction time increased linearly with the reciprocal of the length of the chromatic vectors varying along the four chromatic half-axes. It decreased as a function of stimulus mean luminance in the CDP but not in the CCP. The findings indicated that visual performance using pseudoisochromatic stimuli was dependent on the Weber´s contrast of the luminance noise. Low Weber´s contrast in the luminance noise is suggested to have a reduced effect on chromatic information and, hence, facilitate desegregation of the hue-defined target from the background.
Fil: Cormenzana Méndez, Iñaki. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; Argentina
Fil: Martín, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; Argentina
Fil: Charmichael, Teaire L.. Christian Brothers University; Estados Unidos
Fil: Jacob, Mellina M.. Universidade Federal do Pará; Brasil
Fil: Lacerda, Eliza M. C. B.. Universidade Federal do Pará; Brasil
Fil: Gomes, Bruno D.. Universidade Federal do Pará; Brasil
Fil: Fitzgerald, Malinda E. C.. Christian Brothers University; Estados Unidos. University of Tennessee; Estados Unidos
Fil: Ventura, Dora F.. Universidade de Sao Paulo; Brasil
Fil: Silveira, Luiz C. L.. Universidade do Ceuma; Brasil. Universidade Federal do Pará; Brasil
Fil: O´donell, Beatriz Maria. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Laboratorio de Luminotecnia; Argentina
Fil: Souza, Givago S.. Universidade Federal do Pará; Brasil
description Pseudoisochromatic stimuli have been widely used to evaluate color discrimination and to identify color vision deficits. Luminance noise is one of the stimulus parameters used to ensure that subject´s response is due to their ability to discriminate target stimulus from the background based solely on the hue between the colors that compose such stimuli. We studied the influence of contrast modulation of the stimulus luminance noise on threshold and reaction time color discrimination. We evaluated color discrimination thresholds using the Cambridge Color Test (CCT) at six different stimulus mean luminances. Each mean luminance condition was tested using two protocols: constant absolute difference between maximum and minimum luminance of the luminance noise (constant delta protocol, CDP), and constant contrast modulation of the luminance noise (constant contrast protocol, CCP). MacAdam ellipses were fitted to the color discrimination thresholds in the CIE 1976 color space to quantify the color discrimination ellipses at threshold level. The same CDP and CCP protocols were applied in the experiment measuring RTs at three levels of stimulus mean luminance. The color threshold measurements show that for the CDP, ellipse areas decreased as a function of the mean luminance and they were significantly larger at the two lowest mean luminances, 10 cd/m2 and 13 cd/m2, compared to the highest one, 25 cd/m2. For the CCP, the ellipses areas also decreased as a function of the mean luminance, but there was no significant difference between ellipses areas estimated at six stimulus mean luminances. The exponent of the decrease of ellipse areas as a function of stimulus mean luminance was steeper in the CDP than CCP. Further, reaction time increased linearly with the reciprocal of the length of the chromatic vectors varying along the four chromatic half-axes. It decreased as a function of stimulus mean luminance in the CDP but not in the CCP. The findings indicated that visual performance using pseudoisochromatic stimuli was dependent on the Weber´s contrast of the luminance noise. Low Weber´s contrast in the luminance noise is suggested to have a reduced effect on chromatic information and, hence, facilitate desegregation of the hue-defined target from the background.
publishDate 2016
dc.date.none.fl_str_mv 2016-07-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/131653
Cormenzana Méndez, Iñaki; Martín, Andrés; Charmichael, Teaire L.; Jacob, Mellina M.; Lacerda, Eliza M. C. B.; et al.; Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli; Frontiers Research Foundation; Frontiers in Psychology; 7; 6-7-2016; 1-13; 1006
1664-1078
1664-1078
CONICET Digital
CONICET
url http://hdl.handle.net/11336/131653
identifier_str_mv Cormenzana Méndez, Iñaki; Martín, Andrés; Charmichael, Teaire L.; Jacob, Mellina M.; Lacerda, Eliza M. C. B.; et al.; Color discrimination is affected by modulation of luminance noise in pseudoisochromatic stimuli; Frontiers Research Foundation; Frontiers in Psychology; 7; 6-7-2016; 1-13; 1006
1664-1078
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Frontiers Research Foundation
publisher.none.fl_str_mv Frontiers Research Foundation
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repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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