Differential visual depth discrimination of hooded as compared to albino rats

Observation and shaping learning: A comparison using Long Evans rats

“…The data for each of the four groups on each of the 6 days are Shown in (1954) found that albino animals were poorer than hooded animals in determining depth in a perceptual-discrimination experiment. Recently Davidson & Walk (1969) compared hooded and albino rats in a visual-cliff experiment and found the albinos significantly inferior to the hooded animals.…”

The effects of epinephrine and chlorpromazine on visual cliff behavior in hooded and albino rats

“…Strain differences evident in visual cliff behavior were discussed in terms of differences in emotionality rather than ability to perceive depth_ Various aspects of visual depth perception, as evidence by avoidance of a visual cliff, have been explored in great detail (Walk & Gibson, 1961;Walk, 1965). Species comparisons in most visual cliff studies have primarily focused attention on the sensory capacities of the organisms under study and the percepklal variables presumed to determine preferences for the shallow or deep sides of the cliff (O' Sullivan & Spear, 1964;Routtenberg & Glickman, 1964 b;Davidson & Walk, 1969). However, Routtenberg & Glickman (1964a), in an experiment comparing adult albino and hooded rats, have suggested that differences in visual cliff behavior between these two strains can be partially accounted for by differences in "emotionality."…”

Visual factors in observational learning with rats

“…A second possibility is the existence of differences in vision between rats with nonpigmented eyes (albino rats) and pigmented eyes (hooded rats). Experiments have already shown that hooded rats are superior to albino rats in both visual acuity (Lashley, 1930) and depth perception (Greenhut, 1954;Davidson & Walk, 1969). A third possibility, although it seems unlikely, is that hooded rats acquire a response more *Reprinls may bc obtained from Robert W. Powell.…”