Stereoscopes, 3-D movies, and stereograms all create illusions of depth by relying on the perceptual principle of:
A)convergence
B)motion parallax
C)retinal disparity
D)texture gradient

Question

Quizplus · Accepted Answer

Retinal disparity refers to the difference between the retinal images of the two eyes, which is used by the brain to perceive depth and create a 3-dimensional image. Stereoscopes, 3-D movies, and stereograms all use retinal disparity to create the illusion of depth. Convergence refers to the degree to which the eyes turn inward to focus on an object, and is used by the brain to perceive depth for objects that are closer. Motion parallax refers to the differences in the apparent motion of objects at different distances as we move, and is also used by the brain to perceive depth. Texture gradient refers to the changes in the size, shape, density, and texture of objects as they recede into the distance, and is also used by the brain to perceive depth, but is not the perceptual principle most closely associated with 3-D illusions.

Stereoscopes, 3-D Movies, and Stereograms All Create Illusions of Depth