We also reported on psychophysical experiments indicating that this ratio is the important quantity for perception. 49, p.1969) we showed mathematically that the ratio of the rate of retinal motion over the rate of smooth eye pursuit mathematically determines depth relative to the fixation point in central vision. Visual perception of depth from lateral observer translation uses both retinal image motion and eye movement. This retinal movement of images provides a cue to the relative depth of objects in the environment, however retinal motion alone cannot mathematically determine relative depth of the objects. Things that are closer require our eyes to bend inward more to focus it, and so if your eyes bend more, your brain knows its closer to you.įor monocular cues, you have motion parallax, which says that things closer to you move faster than those farther away (on a road trip the road moves much much faster than the clouds) and relative size (things closer to you are bigger than those far away, like a skyscraper), theres light and shade (basically shading gives you ideas of form and depth) and interposition (things that are partially covered by an object are behind that object).A translating observer viewing a rigid environment experiences “motion parallax,” the relative movement upon the observer’s retina of variously positioned objects in the scene. There are binocular cues (two eyes) and monocular cues (only requiring the use of one eye) to help your brain guage the depth of something, aka how far away it is, how close it is, is it in front of another object or behind it?įor binocular cues- you have retinal disparity (where the image from each eye is compared and the difference between the two images in where things are located gives your brain info on the depth of something) theres convergence, which is the degree to which your eyes bend or rotate to look at something, which tells your brain how close or far away it is. Well thats kind of broad, but hopefully just an overview will help! Depth processing is your brains way of figuring out basically where things are, how far away they are using different cues from your eyes. /r/GAMSAT - Australian & UK Medical school Admission Test.
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