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Gabriele Pretterer, Hermann Bubna-Littitz, Gerhard Windischbauer, Cornelia Gabler, Ulrike Griebel; Brightness discrimination in the dog. Journal of Vision 2004;4(3):10. doi: 10.1167/4.3.10.
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© 2016 Association for Research in Vision and Ophthalmology.
Almost nothing is known about brightness discrimination in animals and how this ability relates to their lifestyles. As arrhythmic visual generalists, three dogs, a German shepherd and two Belgian shepherds, were tested on their ability to discriminate brightness using a series of 30 shades of grey varying from white to black. The dogs were trained to discriminate between different shades of grey in a simultaneous two-choice situation. Weber’s law can be correlated to their ability to discriminate brightness differences with a calculated Weber fraction of 0.22 for the German shepherd and 0.27 for the Belgian shepherds. Thus brightness discrimination in dogs is about 2 times worse than in humans, a diurnal species.
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