Colour vision and contrast sensitivity losses of mercury intoxicated industry workers in Brazil

Ventura, Dora Fix; Simões, Aguinaldo L.; Tomaz, Sandra; Costa, Marcelo Fernandes; Lago, Mayra Coan; Costa, Marcelo T.V.; Canto-Pereira, Luiz Henrique; Souza, John Manuel de; Faria, Marcília A.M.; Silveira, L. C. L.

doi:10.1016/j.etap.2004.12.016

Cited by 80 publications

(115 citation statements)

References 34 publications

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“…For example, mercury can negatively affect vision (Ventura et al, 2005;Cavalleri et al, 1995), as well as learning and memory (Smith et al, 2010;Falluel-Morel et al, 2007), and therefore could disrupt an association between the pattern of sensory input produced by the magnetic field and the visual surrounding. Moreover, our study can exclude that the turtles have even more general defects, which we did not detect in the motor-related performance tests.…”

Section: Discussionmentioning

confidence: 99%

High levels of maternally transferred mercury disrupt magnetic responses of snapping turtle hatchlings (Chelydra serpentina)

Landler

Painter

Coe

et al. 2017

Environmental Pollution

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a b s t r a c tThe Earth's magnetic field is involved in spatial behaviours ranging from long-distance migration to nongoal directed behaviours, such as spontaneous magnetic alignment (SMA). Mercury is a harmful pollutant most often generated from anthropogenic sources that can bio-accumulate in animal tissue over a lifetime. We compared SMA of hatchling snapping turtles from mothers captured at reference (i.e., low mercury) and mercury contaminated sites. Reference turtles showed radio frequency-dependent SMA along the north-south axis, consistent with previous studies of SMA, while turtles with high levels of maternally inherited mercury failed to show consistent magnetic alignment. In contrast, there was no difference between reference and mercury exposed turtles on standard performance measures. The magnetic field plays an important role in animal orientation behaviour and may also help to integrate spatial information from a variety of sensory modalities. As a consequence, mercury may compromise the performance of turtles in a wide variety of spatial tasks. Future research is needed to determine the threshold for mercury effects on snapping turtles, whether mercury exposure compromises spatial behaviour of adult turtles, and whether mercury has a direct effect on the magnetoreception mechanism(s) that mediate SMA or a more general effect on the nervous system.

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Section: Discussionmentioning

confidence: 99%

High levels of maternally transferred mercury disrupt magnetic responses of snapping turtle hatchlings (Chelydra serpentina)

Landler

Painter

Coe

et al. 2017

Environmental Pollution

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“…Psychophysical experiments were performed as described in detail in previous studies (11,12) using Psycho for Windows V2.36 software and a graphic board VSG 2/4 (Cambridge Research System, Cambridge, UK). This system generated the stimuli on a 19-inches FD Trinitron CRT monitor with 100 Hz frame rate, 800x600 pixels spatial resolution (Sony Electronics, Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

Longitudinal measurements of luminance and chromatic contrast sensitivity: comparison between wavefront-guided LASIK and contralateral PRK for myopia

Barboni¹,

Feitosa-Santana²,

Barreto³

et al. 2013

Arq. Bras. Oftalmol.

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Purpose: The present study aimed to compare the postoperative contrast sensitivity functions between wavefront-guided LASIK eyes and their contralateral wavefront-guided PRK eyes. Methods: The participants were 11 healthy subjects (mean age=32.4 ± 6.2 years) who had myopic astigmatism. The spatial contrast sensitivity functions were measured before and three times after the surgery. Psycho and a Cambridge graphic board (VSG 2/4) were used to measure luminance, red-green, and blue-yellow spatial contrast sensitivity functions (from 0.85 to 13.1 cycles/degree). Longitudinal analysis and comparison between surgeries were performed. Results: There was no significant contrast sensitivity change during the one-year follow-up measurements neither for LASIK nor for PRK eyes. The comparison between procedures showed no differences at 12 months postoperative. Conclusions:The present data showed similar contrast sensitivities during one-year follow-up of wave-front guided refractive surgeries. Moreover, one year postoperative data showed no differences in the effects of either wavefront-guided LASIK or wavefront-guided PRK on the luminance and chromatic spatial contrast sensitivity functions.

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“…A mesma tem sido usada para avaliar e diagnosticar alterações nas vias visuais relacionadas a várias doenças, como por exemplo, estrabismo (Kiper & Kiorpes, 1994), depressão (Cavalcanti & Santos, 2005), intoxicação por mercúrio (Ventura et al, 2005), esquizofrenia (Slaghuis, 1998), dentre outras. Contudo, poucos pesquisadores têm utilizado a FSC para avaliar a plasticidade compensatória (compensatory plasticity) visual decorrente da surdez.…”

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Sensibilidade ao contraste de crianças surdas e ouvintes para grades senoidais em condições mesópicas

Santos¹,

Mendes²,

Alves³

2009

Psicol. Reflex. Crit.

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ResumoO objetivo deste trabalho foi comparar a sensibilidade ao contraste (FSC) de crianças surdas e crianças ouvintes para freqüências espaciais de 0,25 a 2,0 cpg (ciclos por grau de ângulo visual) em nível de luminância mesópica (0,7 cd/m 2 ), utilizando o método psicofísico da escolha forçada. Vinte crianças (7-12 anos) participaram desta pesquisa, dez com surdez pré-lingual e dez ouvintes. Todos os participantes apresentavam acuidade visual normal ou corrigida. A ANOVA mostrou diferença significante entre os grupos [F (1, 238) = 15,487; p < 0,001], porém a análise com o teste post-hoc Tukey HSD não revelou diferença significante na comparação freqüência a freqüência entre os dois grupos (p > 0,05). Os resultados sugerem alterações na FSC para estímulos de grade senoidal das crianças surdas em níveis de luminância mesópica. Palavras-chave: Percepção visual; Sensibilidade ao contraste; Freqüências espaciais; Crianças surdas; Método psicofísico. AbstractThe aim of this study was to compare the contrast sensitivity (CSF) of deaf children and hearing children to spatial frequency of 0.25 to 2.0 cpd (cycles per degree of visual angle) at mesopic luminance level (0.7 cd/ m 2 ), using the psychophysical forced-choice method. Twenty children (7-12 years old) participated in this research, ten with prelingual deafness and ten with normal hearing. All participants had normal or corrected visual acuity. The ANOVA showed significant difference between the two groups [F (1, 238) = 15.487; p < 0.001], but the post-hoc Tukey HSD test analysis did not reveal significant difference in frequency to frequency comparison between the two groups (p > 0.05). The results suggest alterations in CSF to sine-wave gratings stimuli of deaf children at mesopic luminance level. Keywords: Visual perception; Contrast sensitivity; Spatial frequency; Deaf children; Psychophysical method.Uma das teorias mais utilizadas nas últimas décadas para tentar explicar como o sistema visual humano (SVH) processa a forma dos objetos foi proposta originalmente por Campbell e Robson (1968). Esta teoria, que foi denominada de modelo de canais múltiplos, defende que o processamento visual acontece através de canais que respondem seletivamente para faixas ou bandas estreitas de freqüên-cias espaciais. A idéia é que um estímulo apresentado no campo visual não estimula todos os neurônios corticais que recebem informações daquela área da retina, mas apenas grupos de neurônios que respondem independente e seletivamente para cada um dos elementos que compõem o estímulo. Isto implica que padrões visuais diferentes são processados por subunidades ou grupos de neurônios diferentes, os quais formam as bases dos canais ou mecanismos seletivos para freqüências espaciais (Campbell & Robson, 1968;De Valois & De Valois, 1990).O modelo de canais múltiplos pressupõe que a função de sensibilidade ao contraste (FSC) representa o envelope de sensibilidade para a série total de canais, cada um sensível a uma faixa restrita e discreta do espectro de freqüência espacial. A FSC é a ...

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Colour vision and contrast sensitivity losses of mercury intoxicated industry workers in Brazil

Cited by 80 publications

References 34 publications

High levels of maternally transferred mercury disrupt magnetic responses of snapping turtle hatchlings (Chelydra serpentina)

High levels of maternally transferred mercury disrupt magnetic responses of snapping turtle hatchlings (Chelydra serpentina)

Longitudinal measurements of luminance and chromatic contrast sensitivity: comparison between wavefront-guided LASIK and contralateral PRK for myopia

Sensibilidade ao contraste de crianças surdas e ouvintes para grades senoidais em condições mesópicas

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