Ch. 8 Motion Perception

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Ch. 8 Motion Perception
2014-05-06 13:12:35
motion perception
Sensation & Perception
terms and concepts of motion perception
Show Answers:

  1. What is motion aftereffect?
    the illusion of motion of a stationary object that occurs after prolonged exposure to a moving object
  2. How is visual ambiguity determined?
    retinal image movement or pursuit eye movement
  3. What is retinal image movement?
    deciding if its object or eye movement
  4. What is pursuit eye movement?
    no retinal image movement
  5. What is real motion?
    velocity thresholds and basic/original visual capability
  6. What are velocity thresholds?
    lowest motion speed at which we can perceive or highest motion speed at which we can perceive
  7. What is involved in apparent motion?
    phi phenomenon and stroboscopic motion
  8. 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
  9. What is the correspondence problem?
    knowing which feature in frame 2 corresponds to a particular feature in frame 1
  10. What does induced movement involve?
    relative displacement and enclosed objects
  11. What is the motion detection system?
    made of the magnocellular system, complex cells, and the medial temporal area
  12. 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)
  13. What is optic array?
    collection of light rays that interact with objects in the world that are in front of a viewer
  14. What is optic flow?
    changing angular positions of points in a perspective image that we experience as we move through the world
  15. What is the corollary discharge theory?
    signal sent to comparator to inform that the eye has moved
  16. What must be present for object motion perception?
    retinal image movement and a corollary discharge signal
  17. What is biological motion?
    pattern of movement of living beings (humans and animals) clues to biological status, gender, and activity
  18. What does structure motion tell us?
    how to define an objects shape and be able to segregate an object from its background
  19. What is smooth pursuit?
    voluntary eye movement in which the eyes move smoothly to follow a moving object
  20. What is a microsaccade?
    an involuntary, small, jerklike eye movement
  21. What is a saccade?
    conscious movement of eyes from one direction to the next, takes roughly 250 milliseconds to take effect