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Name: Kailasa Vaishnavi Section: A College: School of Allied Health and Sciences, Jain University Subject: Health psychology practical Topic: Depth Perception Teacher: Miss Vineetha ma’am Subject: Problem: to demonstrate experimentally the perception of distance Hypothesis: Error In binocular condition will be significantly lower in comparison to monocular condition Introduction Depth perception Depth perception is the ability to see things in three dimensions (including length, width and depth), and to judge how far away an object is. For accurate depth perception, you generally need to have binocular (two-eyed) vision. In a process called convergence, our
two eyes see an object from slightly different angles and our brain compares and processes the two sets of information to form a single image. When both eyes see clearly and the brain processes a single image effectively, it is called stereopsis. People who rely on vision primarily in one eye (called monocular vision) may struggle with depth perception. However, some people who have had good vision in one eye for a long period of time may find they have acceptable depth perception. This is because their brain has adjusted in various ways to make up for the limited visual input from one eye. Depth perception relies on the convergence of both eyes upon a single object, the relative differences between the shape and size of the images on each retina, the relative size of objects in relation to each other, and other cues such as texture and constancy. For example, shape constancy allows the individual to see an object as a constant shape from different angles, so that each eye is recognizing a single shape and not two distinct images. When the input from both eyes is compared, stereopsis, or the impression of depth, occurs.
Visual Illusions Visual illusions offer insight into how motion is perceived. The phi phenomenon is an illusion involving a regular sequence of luminous impulses. Due to first-order motion perception, the luminous impulses are seen as a continual movement. The phi phenomenon explains how early animation worked: it involves taking a series of still images that change slightly, and moving through them very quickly so that the image appears to be moving, rather than the series of still images that it is. Materials: 1) Depth perception box It is a wooden box consist of three vertical rods. All the rods are equal at distance and one of the rods is movable whereas the other two rods are fixed in the box. These rods can be seen through the slit against the white background. There is a light chamber at one side of the box and milky white glass which separates the front part of the box, it acts as the background when illuminated. The front side of the box has a rectangular shape slit with sliding
window to facilitate both binocular and monocular vision of the rods placed in the box. The middle rod is movable back and forth along the grove provided pushing the knob at the top. The other two rods are immovable whereas the movable rod can run across the length of the box. A metric scale is fixed along the groove to indicate the distance of the movable rod from the stationary rods. 2) chin rest is given to place the chin 3) Pencil and paper is use to write down the scoring. Plan: the experiment is conducted in two series: - Approach series and Re approach Series. The experiment is done to find out and compare the estimated error of the subject in each side. Preliminaries Procedure: Approach and Re approach series: Approach series: the middle rod of the box is placed at the extreme end of the box. The subject is supposed to sit away from the rod keeping chin at the chin rest and remain stationary. Look through the slit with both eyes open looking at the two stationary rod towards the subject. As soon as the middle rod starts moving towards you and appears to be in alignment with the two stationary rods say “stop”. This will be repeated 5 times in total. The reading of the pointer on the meter scale will be noted down on the paper each time.
http://www.hitl.washington.edu/projects/ knowledge_base/virtual-worlds/EVE/ III.A.1.c.DepthCues.html http://www.hitl.washington.edu/projects/ knowledge_base/virtual-worlds/EVE/ III.A.1.c.DepthCues.html https://slidetodoc.com/depth-perception-and- visualization-matt-williams-from-http/
