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Binocular Cues in Depth Perception
Having the ability to see objects in three dimensions even though the image we are viewing strikes our retinas at a two-dimensional view. ... To answer this question we must look at how depth perception is measured in relation to the two slightly different views received by each retina creating one joined image.
One of the major perceptual tasks is judging depth or being able to tell which objects are closer to you from those that are further away. ... One way is via binocular cues for depth perception, or cues that require the use of both eyes. The binocular cues are more powerful than the monocular cues. The best way to prove this statement is to try performing a task that requires depth perception, for example, shooting a basketball. ...
Retinal disparity is the major binocular cue. ... Uncrossed retinal disparity is inversely proportional the square of the distance of the object thus disparity is not an effective cue for small depth differences at large distances.
Evidence that retinal disparity gives rise to the experience of depth was provided by Wheatstone, who created the first stereoscope. Slightly different images presented to the two eyes results in a depth percept. To recover depth we need to measure retinal disparity. ...
In the lab, special tests demonstrate the superiority of binocular cues. Binocular information is considered paramount in the planning of prehensile movements. ... Subjects reached for objects following an initial monocular view and binocular information was introduced at predetermined intervals during the reach. If, during the reach, the addition of relative disparities between the hand and target is important then reach profiles should approximate those manifest under full binocular conditions. ... Vision was controlled using a pair of LCD goggles, which could alternate between a binocular and monocular view depending on the experimental condition. Six viewing conditions were employed of which the first two were a fully monocular reach and a fully binocular reach. The final four conditions consisted of a monocular initial view followed by the introduction of binocular information 0%, 25%, 50% or 75% into the temporal duration of the reach following movement onset.
Approximate Word count = 1709
Approximate Pages = 6.8
(250 words per page double spaced)
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