ANOXIA AND BRIGHTNESS DISCRIMINATION
نویسندگان
چکیده
منابع مشابه
Anoxia and Brightness Discrimination
1. Brightness discrimination has been studied with individuals breathing oxygen concentrations corresponding to 7 altitudes between sea level and 17,000 feet. The brightnesses were 0.1, 0.01, and 0.001 millilambert involving only daylight (cone) vision. 2. At these light intensities, brightness discrimination begins to deteriorate at fairly low altitudes. The deterioration is obvious at 8,000 f...
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The most important problem confronting color science is the construction of a uniform color space, i.e., a geometrical model of color discrimination in which Euclidean distances between the points representing colors are proportional to perceived color differences. The traditional approach to the construction of a metric color space is based on the integration of just-noticeable color differenc...
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Contrast thresholds of six semisupine, visually adapted subjects were obtained under short (10-14 sec.) periods of weightlessness and under 1 G control conditions. The target, viewed binocularly, subtended 1.5 ~ and the background 2.6*. Three background luminance levels were used: 0.03, 0.28 and 30.0 ft-L. The contrast required to detect the target was found to be slightly, but consistently, lo...
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Birds have excellent spatial acuity and colour vision compared to other vertebrates while spatial contrast sensitivity is relatively poor for unknown reasons. Contrast sensitivity describes the detection of gratings of varying spatial frequency. It is unclear whether bird brightness discrimination between large uniform fields is poor as well. Here we show that budgerigars (Melopsittacus undulat...
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Two groups of rabbits were trained on a brightness discrimination task. A two-choice discrimination apparatus was used. By means of food reward one group of rabbits was trained to open the darkest gate, the other was trained to open the brightest gate. The second group learned significantly faster than the first one.
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1946
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.29.5.335