Visual depth discrimination in animals.

1962 ◽  
Vol 59 (6) ◽  
pp. 489-501 ◽  
Author(s):  
Paul G. Shinkman
Keyword(s):  
Visual Depth ◽  
Depth Discrimination

Depth Discrimination in Rats on Visual Cliffs

1964 ◽  
Vol 19 (2) ◽  
pp. 423-426 ◽  
Author(s):  
Doris C. Dehardt ◽  
David L. Whitney
Keyword(s):  
Visual Cliff ◽  
Visual Depth ◽  
Open Area ◽  
Deep Side ◽  
Open Model ◽  
Additional Information ◽  
Depth Discrimination ◽  
Texture Density ◽  
Shallow Side

On an open visual cliff rats significantly preferred the shallow side while on an otherwise comparable closed cliff they did not, suggesting either that depth discrimination is enhanced by the additional information provided by the deep side of the open model, or that animals merely avoided the large open area of the deep side. The latter suggests that side preferences in open model cliffs are not necessarily valid indicators of visual depth discriminability in rats. Texture density was not a sufficient cue for depth discriminability as indicated by the preference of Ss for 1-in. checks in both 3-in. vs 1-in. and 1-in. vs ¼-in. comparison tests.

Monocular Depth Perception in Rats

1972 ◽  
Vol 30 (2) ◽  
pp. 427-433
Author(s):  
Sachio Ashida
Keyword(s):  
Depth Perception ◽  
Discrimination Task ◽  
Motion Parallax ◽  
Visual Depth ◽  
Jumping Performance ◽  
Depth Discrimination ◽  
Monocular Depth

64 male hooded rats were tested on a visual depth discrimination task in a modified Lashley Jumping Stand. The monocular Ss ( n = 32) were operated upon to close either the left or right eye and the control Ss ( n = 32) were sham operated. There were no significant differences in jumping performance between the binocular and the monocular Ss although the task was facilitated for both groups when a visual depth was increased. However, the monocular Ss showed significant orienting responses toward the “unoperated” side before they jumped. The results suggest that motion parallax overcomes both monocular and binocular visual weakness in a jumping-stand discrimination situation.

scholarly journals Differential visual depth discrimination of hooded as compared to albino rats

1969 ◽  
Vol 14 (5) ◽  
pp. 207-208 ◽  
Author(s):  
Philip W. Davidson ◽  
Richard D. Walk
Keyword(s):  
Albino Rats ◽  
Visual Depth ◽  
Depth Discrimination

Low-light-level three-dimensional video microscope with long working distance objective lenses

1994 ◽  
Vol 52 ◽  
pp. 226-227
Author(s):  
W. Lin ◽  
J. Gregorio ◽  
T.J. Holmes ◽  
D. H. Szarowski ◽  
J.N. Turner
Keyword(s):  
Three Dimensional ◽  
Light Level ◽  
Stereo Pair ◽  
Light Illumination ◽  
Initial Image ◽  
Low Light ◽  
Image Recording ◽  
Depth Discrimination ◽  
Video Microscope ◽  
Working Distance

A low-light level video microscope with long working distance objective lenses has been built as part of our integrated three-dimensional (3-D) light microscopy workstation (Fig. 1). It allows the observation of living specimens under sufficiently low light illumination that no significant photobleaching or alternation of specimen physiology is produced. The improved image quality, depth discrimination and 3-D reconstruction provides a versatile intermediate resolution system that replaces the commonly used dissection microscope for initial image recording and positioning of microelectrodes for neurobiology. A 3-D image is displayed on-line to guide the execution of complex experiments. An image composed of 40 optical sections requires 7 minutes to process and display a stereo pair.The low-light level video microscope utilizes long working distance objective lenses from Mitutoyo (10X, 0.28NA, 37 mm working distance; 20X, 0.42NA, 20 mm working distance; 50X, 0.42NA, 20 mm working distance). They provide enough working distance to allow the placement of microelectrodes in the specimen.

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