A Supplementary Method of Color Discrimination for the Red-Green Color-Blind

1933 ◽  
Vol 36 ◽  
pp. 181
Author(s):  
Donald C. Portrum
Keyword(s):  
Color Discrimination ◽  
Green Color ◽  
Supplementary Method ◽  
Color Blind

A New Classification of the Red-Green Color-Blind

1929 ◽  
Vol 41 (2) ◽  
pp. 237 ◽  
Author(s):  
Sibyl Walcutt Terman
Keyword(s):  
New Classification ◽  
Green Color ◽  
Color Blind

Small field motion detection in goldfish is red-green color blind and mediated by the M-cone type

2007 ◽  
Vol 24 (3) ◽  
pp. 399-407 ◽  
Author(s):  
MARTIN GEHRES ◽  
CHRISTA NEUMEYER
Keyword(s):  
Motion Detection ◽  
Object Motion ◽  
Moving Object ◽  
Large Field ◽  
Training Procedure ◽  
Green Color ◽  
Cone Type ◽  
Color Blind ◽  
Random Dot Patterns ◽  
Random Dot Pattern

Large field motion detection in goldfish, measured in the optomotor response, is based on the L-cone type, and is therefore color-blind (Schaerer & Neumeyer, 1996). In experiments using a two-choice training procedure, we investigated now whether the same holds for the detection of a small moving object (size: 8 mm diameter; velocity: 7 cm/s). In initial experiments, we found that goldfish did not discriminate between a moving and a stationary stimulus, obviously not taking attention to the cue “moving.” Therefore, random dot patterns were used in which the stimulus was visible only when moving. Using black and white random dot patterns with variable contrast between 0.2 and 1, we found that the fish could see motion only with high (0.8) contrast. In the decisive experiment, a red-green random dot pattern was used. By keeping the intensity of the red dots constant and reducing the intensity of the green dots, a narrow intensity range was found in which goldfish could no longer discriminate between the moving random dot stimulus in random dot surround and the stationary random dot pattern. The same was the case when a red moving disk was presented in green surround. This is the evidence that object motion is red-green color blind, i.e., color information cannot be used to detect the moving object. Calculations of the cone excitation values revealed that the M-cone type is decisive, as this cone type (and not the L-cone type) is not modulated by that particular red-green pattern in which the moving stimulus was invisible.

scholarly journals Discrimination of Three Kinds of Visual Stimuli by Slow-Worm Lizards (Anguis fragilis)

2021 ◽  
Vol 36 ◽  
pp. 16-37
Author(s):  
R. V. Zhelankin ◽  
◽  
I. G. Skotnikova ◽  
L. A. Selivanova ◽  
◽  
...  
Keyword(s):  
Visual Discrimination ◽  
Visual Stimuli ◽  
Color Discrimination ◽  
Behavioral Characteristics ◽  
Green Color ◽  
Geometric Figures ◽  
Round Shape ◽  
Anguis Fragilis ◽  
Behavior Characteristics

Visual abilities to discriminate between spatial and color stimuli was studied, which is ecologically significant for reptiles. Namely: the behavior of slow-warm lizards in a Tshaped maze was investigated in visual discrimination between red and green color tones and sizes of geometric figures of a round shape. The main behavioral characteristics of decisionmaking were analyzed when choosing between possible options: a percentage of erroneous choices, time of choice and a number of lizards’ turns towards alternative ways in the maze, leading to comparable stimuli, before choosing one of them. In case of color discrimination, all the three named behavior characteristics were minimal, while in case of the figures sizes discrimination these values were higher. Thus, discrimination of red and green colors was more successful and less difficult than discrimination of round-shaped geometric figures sizes in the lizards.

scholarly journals Analysis of red/green color discrimination in subjects with a single X-linked photopigment gene

1999 ◽  
Vol 39 (4) ◽  
pp. 707-719 ◽  
Author(s):  
M.A Crognale ◽  
D.Y Teller ◽  
T Yamaguchi ◽  
A.G Motulsky ◽  
S.S Deeb
Keyword(s):  
Color Discrimination ◽  
Green Color

Effect of digitally generated colored filters on Farnsworth-Munsell 100 hue test by red-green color vision-deficient observers

2021 ◽  
Vol 2021 (29) ◽  
pp. 148-153
Author(s):  
Shunnma Saito ◽  
Keiko Sato
Keyword(s):  
Color Vision ◽  
Discrimination Performance ◽  
Color Discrimination ◽  
Spectral Transmittance ◽  
Green Color ◽  
Colored Filter

In this study, the effects of four different digitally generated colored filters on the Farnsworth-Munsell 100 hue test (100-hue test) are analyzed by red-green color-vision deficient (CVD) observers. We digitally simulate the colored filters based on the spectral transmittance of four colored filters, which have been used previously. Five red-green CVD observers are subjected to the 100-hue test on a monitor under nine filter conditions, which comprise one condition without filter and eight conditions with filters. The results suggest that a colored filter that transmits long wavelengths and absorbs medium wavelengths may improve the color discrimination performance of protans and deutans.

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