Hens (Gallus gallus domesticus) were taught to peck at a touch screen. On the screen was a
grid on which a square and a circle were depicted. The square and the circle were given …

In an attempt to demonstrate whether horses could make use of pictorial cues to depth, two
were trained initially to make a relative-line-length discrimination between two lines placed …

The purpose of perceiving depth is to control behaviour within a threedimensional world.
This may involve gross locomotion of the animal within the environment, monitoring the …

Pigeons were trained to discriminate pictures of intact objects from pictures of objects in
which both depth from shading and depth from perspective cues were manipulated. Depth …

The contributions of different monocular depth cues to performance of a scene perception
task were investigated in 4 pigeons. They discriminated the sequential depth ordering of …

Two chromatically identical patterns, a diamond and a ladder, were shown on a computer
touchscreen. Domestic hens were reinforced for pecking at the pattern that was the highest …

Although many sources of three-dimensional information have been isolated and
demonstrated to contribute independently to depth vision in animal studies, it is not clear …

A behavioural method is described for the assessment of depth perception of kittens.
Measurement is made of the smallest separation in depth that can be discriminated between …

An attempt was made to increase the amount of pecking by using smaller stimulus objects
and by testing pairs of chicks together. Depth was varied this time by pairing spheres with …

In 2 experiments involving computer-rendered versions of single shapes or “geons,” the
extent to which depth rotation affects the visual discrimination performance of pigeons in …