Binocular depth Flashcards
Rabbits (and other laterally eyed animals) have an advantage over humans in their ______ at the cost of _____
Increase field of view
Reduced binocular field
What are the two advantages of binocular vision?
Binocular fusion and stereopsis
What is stereopsis?
The perception of depth from binocular vision
True/False? We can calculate depth without shape
True
How can we specify the position of any given retinal image?
By labelling them in terms of whether they are situated in the nasal or temporal retina
What is the horopter?
The plane around the fixation point where all images are in focus (temporal disparity = nasal disparity)
When objects are in front of the horopter, the distance in the ____ retina is greater than the _____ retina
Temporal disparity > Nasal disparity
When objects are behind the horopter, the distance in the _____ retina is greater than the ______ retina
Nasal disparity > Temporal disparity
How is retinal disparity calculated?
D = dt - dn
Objects on horopter yield zero disparity
Objects in front of horopter yield positive disparity
Objects behind horopter yield negative disparity
What is the Vieth-Muller circle?
A theoretical pseudo-horopter where all objects on the circle have the same retinal disparity
What is crossed and uncrossed disparity?
Crossed: dt > dn (in front of horopter)
Uncrossed: dn > dt (behind horopter)
The visual field of each eye is processed in the ______ visual cortex
Contralateral
What is disparity selectivity?
A property of V1 neurons where only a certain type of disparity (zero, crossed, uncrossed) is encoded by a neuron
(uncrossed/zero/crossed) disparity is referred to as “___” tuned
Uncrossed: “far” tuned
Zero: “Zero” tuned
Crossed: “Near tuned”
What is the distribution of uncrossed, crossed, and zero cells?
Normal
