In this blog I am going to focus on cues. Making it follow on from my previous blog but adding more detail into the cues that we use when we perceive things.
The cues that we use we use when we perceive things are called binocular and monocular, these help use to determine the distance. The binocular cues that we have determine the depth cues. Both eyes are needed to see binocular cues. Convergence and retinal disparity are the two most important binocular cues. Monocular cues came be see by using only one eye. for example overlap, texture, shading, size.
In 1960 Eleanor J, Gibson and R.D. Walk conducted a piece of research called ‘the visual cliff’. The purpose of this piece of research was to investigate depth perception in humans and animals. The research was tried out on babies, rats, kitten and tortoises.
The visual cliff was where a clear piece of plastic was placed over a drop. Giving the appearance of a cliff but not an actual cliff as the plastic was level with the first surface. The baby would crawl on the flat surface and reach the cliff. The test was to see if the baby would crawl over the cliff or not.
If the child or the animal had developed depth perception then they would not go over the cliff.
This piece of research suggests that we do not inherit cues of depth perception and we are not born with them, but in fact we learn them from our every day experiences. As a baby or an animal moves around in the first few weeks/months of life then they learn that things are at different heights. They learn to see the world in 3d rather than 2d.
Here are some extra links for more information and some great videos from you tube.