QUESTION 10 Flashcards
Depth perception
visual ability to perceive world in 3D and the distance of objects
Two binocular cues
1) convergence
2) disparity
What do convergence and disparity contribute towards
depth perception
What contributes towards depth perception
binocular cues (convergence and disparity
What distorts perception of object size
Constancies such as size and distance
What does Emmert’s law look at
relationship between apparent distance and its perceived size
Emmert’s law formula
S = R x D
S = R x D representations
S = perceived size of object R = retinal image size D = perceived distance
Emmert’s formula explained
R remains constant therefore D will affect S
3 Depth Constancies
1) size constancy
2) shape constancy
3) height on a plane
Size constancy
Stability in perceived size despite changes in object distance and retinal image
Shape constancy
perceived shape of object distorted through variations in orientation
Height on a plane
a cue for distance is based on distance relative to bottom of horizon, objects placed higher on horizon are perceived as smaller
Two examples where mechanisms of size constancy break down
1) Ponzo illusion
2) moon illusion
What does Ponzo illusion demonstrate
how size constancy can break down, top line looks bigger even though same length
