Presentation on theme: "PERCEPTION Chapter 4.5. Gestalt Principles Gestalt principles are based on the idea that the whole is greater than the sum of the parts. These principles."— Presentation transcript:
Depth Perception This allows us to develop the ability to judge depth or distance away of objects. We perceive this distance by using monocular and binocular cues.
There is evidence that depth perception begins to develop early in life. The visual cliff experiment showed this. Very young infants seemed to unafraid when placed on the cliff at the edge of the apparent drop-off.
But by nine months, infants responded with fear to the drop-off. Other studies showed that they wouldn’t even cross the “cliff” when called by their mothers. Crawling apparently signaled the need to sense this danger.
The only animal that would regularly cross the “cliff” was a rat. This was because they don’t use their vision to sense danger. Their whiskers told them that the surface was still solid so they moved across it.
Monocular Cues There are several of these which allow us to judge how close or far away objects are.
1. Linear Perspective: the tendency to see parallel lines as coming closer together, or converging, as they move away from us
5. Motion Parallax: the tendency of objects to seem to move forward or backward depending on how far away they are from the viewer; an example is looking at nearby things out the car window versus objects farther away
Binocular Cues Both eyes are needed to perceive these cues.
1. Retinal Disparity: binocular cue for perceiving depth based on the difference between two images of an object that the retina receives as the object moves closer; as the object gets closer, the disparity gets greater