wk4: ND - Depth Perception Flashcards
Where is the first point in the visual pathways where neurons receive binocular input?
V1
Can neurons be tuned for disparity?
Yes
What do random dot stereograms demonstrate in terms of depth perception?
that depth can be seen without borders/edge cues
True/False: V1 cells encode disparity from random dot stereograms
True
Are cells in the MST linked direction/disparity cells?
Some are
What does dynamic disparity tuning in MST provide info about? (2)
parallax
depth cues for self motion
List monocular cues to depth (6)
Relative size Occlusion Cast shadows Shading Dynamic shadows (shadow motion) Height
How does the size of the retinal image correlate with object size and distance?
Size of retinal image of an object is proportional to the object’s size, but inversely proportional to the distance to the object
What does size interpretation depend on?
a range of cues relating to visual context
What is linear perspective? Give an example
The width of the train tracks becomes smaller with distance
What is size constancy?
Our interpretation of the size of objects is relatively constant, despite large differences in the size of the objects on the retina
Can texture be a monocular cue?
yes
What are the neuronal mechanisms underpinning binocular rivalry?
Not completely understood. Occurs through multiple stages of visual pathways. Evidence for early stage encoding of monocular info (LGN/V1) and for residual encoding of the suppressed visual signal.
What is Kinetic Depth effect?
Person is stationary but the object is moving (e.g. rotating). The retinal velocities depend on the distance of each feature from the observer
Name 4 possible binocularity outcomes from 2 eyes
Fusion
Supression
Diplopia
Rivalry (swapping between percepts)
