PSYC 213 Lecture Notes - Lecture 9: Retina, Parallax, The Technique
15 Sep 2018
School
Department
Course
Professor
Document Summary
Our visual system has to resolve how to perceive a 3d world from a retinal image that is 2d. Under this geometry, there are a number of rules that objects in 3d follow. Objects maintain the same size and shape as they move around in space: but, on the retinal image, objects shrink with distance. Lines that are parallel in the external world, converge towards the horizon in our retinal image of the world. Also, objects that are the same size in our external world, shrink with distance in our retinal image of the world. There are two main ways that the visual system solves this problem. (1) monocular cues: flat image, but we still see depth, there is linear perspective, we see it receding into the distance, these are cues that make sense locally but globally they do not make much sense. (2) binocular vision and stereopsis: two eyes two images of the world.
