COGS 101A Lecture Notes - Horopter, Binocular Disparity, Motion Perception
● Motion Perception
○ Corollary discharge theory
■ Proposed that motion perception depends on
● Motor signal
○ Signal sent to the eyes to move eye muscles
● Image displacement signal (IDS)
○ Movement of image stimulating receptors across the retina
○ Comparator
■ proposed evaluation mechanism that considers whether one or both of
these occurred
■ If it detects only 1 of these signals = motion; if none or both = no motion
● Depth Perception
○ Cue approach to depth
■ We identify info in the retinal image that is correlated with depth in a
scene
● Oculomotor
○ Based on our ability to sense position of eyes
○ Really only useful close up
○ Convergence
■ Inward movement of eyes
○ Accommodation
■ Change in lens shape when we focus on object at various distances
● Monocular
○ Based on wis info available within one eye
■ Pictorial
● Visual angle
○ The angel an object makes relative to the observer’s eye
● Ebbinghaus illusion
○ Dots surrounded by larger or smaller dots
■ Larger = smaller center; vice versa
■ Moon illusion
● Vertigo effect
○ When vis angle and linear perspective clash
● Atmospheric perspective
○ Objects in the distance appear blurred and tinged blue
● Texture gradient
○ Several similar objects appear to be more crowded the
farther they are from you
● Occlusion
○ When things are in front of other things
■ Motion
● Motion parallax
○ When we move, objects appear to glide past
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Document Summary
Signal sent to the eyes to move eye muscles. Movement of image stimulating receptors across the retina. Proposed evaluation mechanism that considers whether one or both of these occurred. If it detects only 1 of these signals = motion; if none or both = no motion. We identify info in the retinal image that is correlated with depth in a scene. Based on our ability to sense position of eyes. Change in lens shape when we focus on object at various distances. Based on wis info available within one eye. The angel an object makes relative to the observer"s eye. Dots surrounded by larger or smaller dots. When vis angle and linear perspective clash. Objects in the distance appear blurred and tinged blue. Several similar objects appear to be more crowded the farther they are from you. When things are in front of other things. When we move, objects appear to glide past.
