Dora Fix Ventura

Universidade de São Paulo

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Marcelo Fernandes Costa

Universidade de São Paulo

Luiz Carlos L. Silveira

Universidade Federal do Pará

Mirella Telles Salgueiro Barboni

Semmelweis University

Daniela Maria Oliveira Bonci

Hospital Universitário da Universidade de São Paulo

Balázs Vince Nagy

Budapest University of Technology and Economics

Givago da Silva Souza

Universidade Federal do Pará

Mirella Gualtieri

Universidade de São Paulo

Solange Rios Salomão

Universidade Federal de São Paulo

Francisco Max Damico

Universidade de São Paulo

Einat Hauzman

Universidade de São Paulo

Cooperative Institutions

Universidade de São Paulo

275

Universidade Federal do Pará

Universidade Federal de São Paulo

Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo

Sociedade Brasileira de Neurociências e Comportamento

Hospital Universitário da Universidade de São Paulo

Universidade Brasil

Instituto da Visão

Universidade Federal do Rio de Janeiro

Universidade Federal de Minas Gerais

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The spectral input systems of hymenopteran insects and their receptor-based colour vision

Journal of Comparative Physiology A (1992)

Dagmar Peitsch Andrea Fietz Horst Hertel John de Souza Dora Fix Ventura

Spectral sensitivity

Trichromacy

10.1007/bf00190398

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Citations (751)

Retinal Topographic Maps: A Glimpse into the Animals’ Visual World

InTech eBooks (2018)

Einat Hauzman Daniela Maria Oliveira Bonci Dora Fix Ventura

The vertebrates' retina has a highly conserved laminar organization of 10 alternating nuclear and plexiform layers. Species differences in the retinal specializations, i.e., areas of higher cell density, among the species, represent specific regions of the visual field of higher importance for a better spatial resolution and indicate distinct evolutionary pressures on the structures of the visual system, which can be related to many aspects of the species evolutionary history. In this chapter, we analyzed the density and distribution of cells of the retinal ganglion cell layer (GCL) and estimated the upper limits of the spatial resolving power of 12 species of snakes from the Colubridae family, 6 diurnal and 6 nocturnal, which inhabit different habitats. Our results revealed lower visual acuity in nocturnal species, compared to diurnal, and we observed different types of retinal specialization, horizontal streak, area centralis, or scattered distribution, with higher cell density in different retinal regions, depending on the species. These variations may be related to ecological and behavioral features, such as daily activity pattern, habitat, and substrate preferentially occupied, hunting strategies and diet. This comparative study indicates the complexity of the adaptive strategies of the snakes' visual system.

10.5772/intechopen.74645

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Citations (15)

Color vision impairment with low-level methylmercury exposure of an Amazonian population – Brazil

NeuroToxicology (2018)

Cláudia Feitosa-Santana Givago da Silva Souza Esaú Ventura Pupo Sirius Anderson Raiol Rodrigues Maria Izabel Tentes Côrtes

Land exploitation that follows deforestation and mining can result in soil erosion and the release of mercury to the waters of rivers in the Amazon Basin. Inorganic mercury is methylated by bacteria that are present in the environment and it serves as a source of human contamination through fish consumption in the form of methylmercury. Long-term exposure to low-level methylmercury in the riverside populations can lead to nervous system alterations, some of which are visual impairments such as loss of luminance contrast sensitivity, restricted visual fields and color vision defects. The present study sought to examine color vision in a group of adults living in the central Brazilian Amazon who were exposed to low-levels of methylmercury. Total Hg concentrations were measured from hair collected at the time of the testing. The D15d and FM100 color vision arrangement tests were applied in a population of 36 (22 males) and 42 (25 males), respectively. Controls were healthy volunteers from the cities of São Paulo for the D15d and Belém for the FM100. There was a statistically significant difference in performance between those who were exposed and controls for both tests (p < 0.01 and p < 0.0001, respectively, Mann-Whitney U test), meaning that adults living in this region of the Amazon made more mistakes on both tests when compared to controls. A linear regression was performed using Hg concentrations and test scores. Hg concentrations accounted for 7% and 2% of color D15d and FM100 arrangement test errors, respectively. Although other studies have previously found color vision impairment in the Amazon, they tested inhabitants on the east side of the Amazon, while this study was conducted in the central Amazon region and it is the first study in a population with no direct contact with the Hg source of contamination. These results suggest that long-term exposure to low-level methylmercury in riverside populations is more widely spread in the Amazon Basin than previously reported. This information is needed to implement public health policies that will ensure a safer environment for the Amazonian population.

Methylmercury

Amazon basin

Mercury

Color Vision Defects

10.1016/j.neuro.2018.01.010

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Citations (16)

Visual Acuity alterations in Congenital Zika Syndrome (CZS) children from Rio de Janeiro.

Investigative Ophthalmology & Visual Science (2020)

L Baran Diego Jorge Maia Lima Marcelo Fernandes Costa Heydi Segundo Tabares Leonardo Aparecido da Silva

Zika Virus

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U.S. – Brazil Student Exchange Program: Perspectives of Brazilian Professors

Journal of Applied Rehabilitation Counseling (2007)

Valdelúcia Alves da Costa Maria Martha Costa Hübner Cássia Maria Buchalla Paulo dos Santos Rodrigues Dora Fix Ventura

10.1891/0047-2220.38.3.5

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Uniform trichromacy in Alouatta caraya and Alouatta seniculus: behavioural and genetic colour vision evaluation

Frontiers in Zoology (2021)

Leonardo Dutra Henriques Einat Hauzman Daniela Maria Oliveira Bonci Belinda S. W. Chang José Augusto Pereira Carneiro Muniz

Abstract Primate colour vision depends on a matrix of photoreceptors, a neuronal post receptoral structure and a combination of genes that culminate in different sensitivity through the visual spectrum. Along with a common cone opsin gene for short wavelengths ( sws1 ), Neotropical primates (Platyrrhini) have only one cone opsin gene for medium-long wavelengths ( mws/lws ) per X chromosome while Paleotropical primates (Catarrhini), including humans, have two active genes. Therefore, while female platyrrhines may be trichromats, males are always dichromats. The genus Alouatta is inferred to be an exception to this rule, as electrophysiological, behavioural and molecular analyses indicated a potential for male trichromacy in this genus. However, it is very important to ascertain by a combination of genetic and behavioural analyses whether this potential translates in terms of colour discrimination capability. We evaluated two howler monkeys ( Alouatta spp.), one male A. caraya and one female A. seniculus , using a combination of genetic analysis of the opsin gene sequences and a behavioral colour discrimination test not previously used in this genus. Both individuals completed the behavioural test with performances typical of trichromatic colour vision and the genetic analysis of the sws1 , mws , and lws opsin genes revealed three different opsin sequences in both subjects. These results are consistent with uniform trichromacy in both male and female, with presumed spectral sensitivity peaks similar to Catarrhini, at ~ 430 nm, 532 nm, and 563 nm for S-, M- and L-cones, respectively.

Trichromacy

Opsin

Color Vision Defects

10.1186/s12983-021-00421-0

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Citations (6)

Analysis of the Expression of the Rhodopsin Gene Rh1 in Retinas of Nocturnal and Diurnal Dipsadidae Snakes and Comparative Study of the Density of Photoreceptors and GCL Cells

Investigative Ophthalmology & Visual Science (2013)

Einat Hauzman Daniela Maria Oliveira Bonci Maureen Neitz Jay Neitz Dora Fix Ventura

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