Brightness discrimination in the dog.

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.

[1]  M. C. Wells,et al.  The relative importance of the distance senses in coyote predatory behaviour , 1978, Animal Behaviour.

[2]  H. Busch,et al.  Das visuelle Leistungsvermögen der Seebären (Arctocephalus pusillus und Arctocephalus australis) , 1987 .

[3]  W. Neuhaus,et al.  Über die Sehschärfe des Haushundes bei verschiedenen Helligkeiten , 1967, Zeitschrift für vergleichende Physiologie.

[4]  L. Peichl.  Catecholaminergic amacrine cells in the dog and wolf retina , 1991, Visual Neuroscience.

[5]  Lois E. Bueler.  Wild Dogs of the World , 1974 .

[6]  J H Parkes,et al.  Progressive rod-cone degeneration in the dog: characterization of the visual pigment. , 1982, Investigative ophthalmology & visual science.

[7]  S. Yokoyama,et al.  The "five-sites" rule and the evolution of red and green color vision in mammals. , 1998, Molecular biology and evolution.

[8]  Ulrike Griebel,et al.  Spectral sensitivity and Color Vision in the Bottlenose Dolphin (Tursiops Truncatus) , 2002 .

[9]  S. Duke-Elder.  System of Ophthalmology , 1962 .

[10]  Henrik Österholm.  The significance of distance receptors in the feeding behaviour of the Fox, Vulpes vulpes L. , 1964 .

[11]  H. G. Lloyd.  The red fox. , 1980 .

[12]  L. B. Arey,et al.  The numerical relation between the ganglion cells of the retina and the fibers in the optic nerve of the dog , 1942 .

[13]  F. Stefani,et al.  [Retinal degeneration in the dog]. , 1977, Bericht uber die Zusammenkunft. Deutsche Ophthalmologische Gesellschaft.

[14]  J. Sturman,et al.  A comparative study of the tapetum, retina and skull of the ferret, dog and cat. , 1985, Laboratory animal science.

[15]  J. Odom,et al.  Canine visual acuity: retinal and cortical field potentials evoked by pattern stimulation. , 1983, The American journal of physiology.

[16]  G. Aguirre,et al.  Development of hereditary tapetal degeneration in the beagle dog. , 1988, Current eye research.

[17]  Ulrike Griebel,et al.  Brightness discrimination ability in the West Indian manatee (Trichechus manatus). , 1997, The Journal of experimental biology.

[18]  Christine A. Curcio,et al.  Chapter 5 Organization and development of the primate photoreceptor mosaic , 1991 .

[19]  G. H. Jacobs,et al.  Photopigments of dogs and foxes and their implications for canid vision , 1993, Visual Neuroscience.

[20]  H. Scheibner,et al.  Zum Begriff der spektralen visuellen Empfindlichkeit, mit elektroretinographischen Ergebnissen am Hund , 1969, Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie.

[21]  Louis W. Gellermann.  Chance Orders of Alternating Stimuli in Visual Discrimination Experiments , 1933 .

[22]  C. M. Kemp,et al.  Rhodopsin levels in the central retinas of normal miniature poodles and those with progressive rod-cone degeneration. , 1992, Experimental eye research.

[23]  T. P. Lesiuk,et al.  Fine structure of the canine tapetum lucidum. , 1983, Journal of anatomy.

[24]  L. C. Thomson,et al.  The electroretinogram of the dog , 1953, The Journal of physiology.

[25]  G H Jacobs,et al.  Color vision in the dog , 1989, Visual Neuroscience.

[26]  L. Peichl,et al.  Topography of ganglion cells in the dog and wolf retina. , 1992, The Journal of comparative neurology.

[27]  G. H. Jacobs,et al.  Cone spectral sensitivity in the harbor seal (Phoca vitulina) and implications for color vision , 1998 .

[28]  James C. Smith,et al.  Behavioral determination of critical flicker fusion in dogs , 1989, Physiology & Behavior.

[29]  D. Mutti,et al.  Effect of optical defocus on visual acuity in dogs. , 1997, American journal of veterinary research.

[30]  T. Cornsweet,et al.  Luminance discrimination of brief flashes under various conditions of adaptation , 1965, The Journal of physiology.

[31]  S. Sherman,et al.  Behavioral and morphological evidence for binocular competition in the postnatal development of the dog's visual system , 1975, The Journal of comparative neurology.

[32]  P E Miller,et al.  Vision in dogs. , 1995, Journal of the American Veterinary Medical Association.

[33]  Lars Wadensten.  THE USE OF FLICKER ELECTRORETINOGRAPHY IN THE HUMAN EYE , 1956, Acta ophthalmologica.