Ch. 8 Motion Perception
Card Set Information
Ch. 8 Motion Perception
Sensation & Perception
terms and concepts of motion perception
What is motion aftereffect?
the illusion of motion of a stationary object that occurs after prolonged exposure to a moving object
How is visual ambiguity determined?
retinal image movement or pursuit eye movement
What is retinal image movement?
deciding if its object or eye movement
What is pursuit eye movement?
no retinal image movement
What is real motion?
velocity thresholds and basic/original visual capability
What are velocity thresholds?
lowest motion speed at which we can perceive or highest motion speed at which we can perceive
What is involved in apparent motion?
phi phenomenon and stroboscopic motion
What is apparent motion?
the illusory impression of smooth motion resulting from the rapid alternation of objects that appear in different location in rapid succession
What is the correspondence problem?
knowing which feature in frame 2 corresponds to a particular feature in frame 1
What does induced movement involve?
relative displacement and enclosed objects
What is the motion detection system?
made of the magnocellular system, complex cells, and the medial temporal area
What is the Gibson's theory of motion perception?
involves optic flow field and looming, and object moving across a background (perceive motions from objects in environment and interpret by brain, bottom-up theory)
What is optic array?
collection of light rays that interact with objects in the world that are in front of a viewer
What is optic flow?
changing angular positions of points in a perspective image that we experience as we move through the world
What is the corollary discharge theory?
signal sent to comparator to inform that the eye has moved
What must be present for object motion perception?
retinal image movement and a corollary discharge signal
What is biological motion?
pattern of movement of living beings (humans and animals) clues to biological status, gender, and activity
What does structure motion tell us?
how to define an objects shape and be able to segregate an object from its background
What is smooth pursuit?
voluntary eye movement in which the eyes move smoothly to follow a moving object
What is a microsaccade?
an involuntary, small, jerklike eye movement
What is a saccade?
conscious movement of eyes from one direction to the next, takes roughly 250 milliseconds to take effect