Bellany Barbosa Lopes, Terezinha Medeiros Gonçalves Loureiro, Felipe André da Costa Brito, Letícia Miquilini, Alódia Brasil, Marcelo Fernandes Costa, Railson Cruz Salomão, Dora Fix Ventura, Ana Leda Brino, Givago da Silva Souza
{"title":"亮度噪声影响视觉诱发电位的假定亮度成分，但不影响色度成分。","authors":"Bellany Barbosa Lopes, Terezinha Medeiros Gonçalves Loureiro, Felipe André da Costa Brito, Letícia Miquilini, Alódia Brasil, Marcelo Fernandes Costa, Railson Cruz Salomão, Dora Fix Ventura, Ana Leda Brino, Givago da Silva Souza","doi":"10.1186/s41155-025-00348-z","DOIUrl":null,"url":null,"abstract":"<p><strong>Introduction: </strong>Pseudoisochromatic stimuli are widely used in psychophysical color vision testing and the features of the luminance noise present on these stimuli have been reported modifying the psychophysical chromatic discrimination.</p><p><strong>Objective: </strong>The present study investigated how modifications in the luminance noise features (luminance contrast and number of luminance values) affect chromatic visual evoked cortical potentials (VECP) elicited by pseudoisochromatic gratings, aiming to evaluate the influence of luminance contrast and the number of luminance values in the pseudoisochromatic stimulus on the chromatic VECP.</p><p><strong>Methods: </strong>The sample consisted of seven young trichromatic participants. The waveforms of the visual evoked cortical potentials (VECP) were analyzed, focusing on the P1, N1, and P2 components across all stimulus conditions. The luminance noise contrast in the pseudoisochromatic stimulus had distinct effects on the amplitudes of the VECP components. Significant effects were observed for the amplitudes of the P1 (p = 0.01) and P2 (p = 0.04) components, while no significant effect was found on the amplitude of the N1 component (p = 0.3).</p><p><strong>Results: </strong>There was no significant effect of the luminance noise range on the latency of the VECP components (P1 VECP component, p = 0.54; N1 VECP component, p = 0.79; P2 VECP component, p = 0.49). The number of luminance values in the noise had no significant effect on VECP components amplitude and latency. Different manipulations of luminance noise influenced P1 and P2 VECP components and no modification of the luminance noise had influence on the main chromatic VECP component, N1 component.</p><p><strong>Conclusion: </strong>Manipulations in features of the luminance noise in pseudoisocrhomatic stimulus impacted in putative luminance components, but not chromatic components, of visual evoked potentials. The present findings may have potential applications in clinical neuro-ophthalmology, particularly for assessing congenital and acquired color blindness.</p>","PeriodicalId":46901,"journal":{"name":"Psicologia-Reflexao E Critica","volume":"38 1","pages":"22"},"PeriodicalIF":2.0000,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12304376/pdf/","citationCount":"0","resultStr":"{\"title\":\"Luminance noise impacts putative luminance components of visual evoked potentials but not chromatic components.\",\"authors\":\"Bellany Barbosa Lopes, Terezinha Medeiros Gonçalves Loureiro, Felipe André da Costa Brito, Letícia Miquilini, Alódia Brasil, Marcelo Fernandes Costa, Railson Cruz Salomão, Dora Fix Ventura, Ana Leda Brino, Givago da Silva Souza\",\"doi\":\"10.1186/s41155-025-00348-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Introduction: </strong>Pseudoisochromatic stimuli are widely used in psychophysical color vision testing and the features of the luminance noise present on these stimuli have been reported modifying the psychophysical chromatic discrimination.</p><p><strong>Objective: </strong>The present study investigated how modifications in the luminance noise features (luminance contrast and number of luminance values) affect chromatic visual evoked cortical potentials (VECP) elicited by pseudoisochromatic gratings, aiming to evaluate the influence of luminance contrast and the number of luminance values in the pseudoisochromatic stimulus on the chromatic VECP.</p><p><strong>Methods: </strong>The sample consisted of seven young trichromatic participants. The waveforms of the visual evoked cortical potentials (VECP) were analyzed, focusing on the P1, N1, and P2 components across all stimulus conditions. The luminance noise contrast in the pseudoisochromatic stimulus had distinct effects on the amplitudes of the VECP components. Significant effects were observed for the amplitudes of the P1 (p = 0.01) and P2 (p = 0.04) components, while no significant effect was found on the amplitude of the N1 component (p = 0.3).</p><p><strong>Results: </strong>There was no significant effect of the luminance noise range on the latency of the VECP components (P1 VECP component, p = 0.54; N1 VECP component, p = 0.79; P2 VECP component, p = 0.49). The number of luminance values in the noise had no significant effect on VECP components amplitude and latency. Different manipulations of luminance noise influenced P1 and P2 VECP components and no modification of the luminance noise had influence on the main chromatic VECP component, N1 component.</p><p><strong>Conclusion: </strong>Manipulations in features of the luminance noise in pseudoisocrhomatic stimulus impacted in putative luminance components, but not chromatic components, of visual evoked potentials. The present findings may have potential applications in clinical neuro-ophthalmology, particularly for assessing congenital and acquired color blindness.</p>\",\"PeriodicalId\":46901,\"journal\":{\"name\":\"Psicologia-Reflexao E Critica\",\"volume\":\"38 1\",\"pages\":\"22\"},\"PeriodicalIF\":2.0000,\"publicationDate\":\"2025-07-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12304376/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Psicologia-Reflexao E Critica\",\"FirstCategoryId\":\"102\",\"ListUrlMain\":\"https://doi.org/10.1186/s41155-025-00348-z\",\"RegionNum\":4,\"RegionCategory\":\"心理学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PSYCHOLOGY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Psicologia-Reflexao E Critica","FirstCategoryId":"102","ListUrlMain":"https://doi.org/10.1186/s41155-025-00348-z","RegionNum":4,"RegionCategory":"心理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PSYCHOLOGY, MULTIDISCIPLINARY","Score":null,"Total":0}
Luminance noise impacts putative luminance components of visual evoked potentials but not chromatic components.
Introduction: Pseudoisochromatic stimuli are widely used in psychophysical color vision testing and the features of the luminance noise present on these stimuli have been reported modifying the psychophysical chromatic discrimination.
Objective: The present study investigated how modifications in the luminance noise features (luminance contrast and number of luminance values) affect chromatic visual evoked cortical potentials (VECP) elicited by pseudoisochromatic gratings, aiming to evaluate the influence of luminance contrast and the number of luminance values in the pseudoisochromatic stimulus on the chromatic VECP.
Methods: The sample consisted of seven young trichromatic participants. The waveforms of the visual evoked cortical potentials (VECP) were analyzed, focusing on the P1, N1, and P2 components across all stimulus conditions. The luminance noise contrast in the pseudoisochromatic stimulus had distinct effects on the amplitudes of the VECP components. Significant effects were observed for the amplitudes of the P1 (p = 0.01) and P2 (p = 0.04) components, while no significant effect was found on the amplitude of the N1 component (p = 0.3).
Results: There was no significant effect of the luminance noise range on the latency of the VECP components (P1 VECP component, p = 0.54; N1 VECP component, p = 0.79; P2 VECP component, p = 0.49). The number of luminance values in the noise had no significant effect on VECP components amplitude and latency. Different manipulations of luminance noise influenced P1 and P2 VECP components and no modification of the luminance noise had influence on the main chromatic VECP component, N1 component.
Conclusion: Manipulations in features of the luminance noise in pseudoisocrhomatic stimulus impacted in putative luminance components, but not chromatic components, of visual evoked potentials. The present findings may have potential applications in clinical neuro-ophthalmology, particularly for assessing congenital and acquired color blindness.
期刊介绍：
Psicologia: Reflexão & Crítica is a journal published three times a year by Programa de Pós-Graduação em Psicologia do Desenvolvimento (Psychology Graduate Program) of the Universidade Federal do Rio Grande do Sul - UFRGS (Federal University of Rio Grande do Sul). Its objective is to publish original works in the psychology field: articles, short reports on research and reviews as well as to present to the scientific community texts which reflect a significant contribution for the psychology field. The short title of the journal is Psicol. Refl. Crít. It must be used regarding bibliographies, footnotes, as well as bibliographical strips and references.
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