chapter 8 Flashcards
(16 cards)
motion
change in position over time
real motion
motion created by continual change in the position of an object relative to some frame of reference
apparent motion
appearance of real motion from a sequence of still images
correspondence problem
how the visual system knows if an object seen at time 1 is the same object at time 2
induced motion
an illusion where one moving object makes another appear to be moving
reichardt detectors
neural circuits
detect motion using time delays
- object moves across field of vision hits point A and then point B
- point A delayed before reaching a comparator where A and B meet
- if point A and B detect at the same time, motion is percieved
corollary discharge theory
feedback from eye muscles as we track an object integral to our perception of motion
akinetopsia
unable to detect motion, damage to MT
motion aftereffect
stationary object seen as moving in the opposite direction of just observed real or apparent motion
point walker display
- lights attached to body, filmed moving in a dark environment
- infer shape and emotion
affordance
information in the visual world that specifies how that information can be used
gradient of flow
difference in perception of the speeds of objects moving past us relative to their distance
focus of expansion
destination point in an optic flow display, from which point perceived motion derives
lateral intraparietal (LIP) area
area of the primate parietal cortex controls eye movements
medial intraparietal (MIP) area
area of the posterior parietal lobe
planning/controling reaching movements if arms
anterior intraparietal (AIP) area
region of the posterior parietal lobe
grasping
