Unit 3.10

Question 1

What is an aperture?

Answer 1

an opening that allows only a partial view of an object

Question 2

What is the aperture problem?

Answer 2

the fact that when a moving object is viewed through an aperture, the direction of motion of a local feature or part of the object may be ambiguous

Question 3

How does the visual system interpret motion within an aperture?

Answer 3

by analyzing local features seen through the aperture and making assumptions about the occlusions

Question 4

What role do T-junctions play in the perception of motion?

Answer 4

T-junctions indicate where two bars meet an occluder, which changes the assumption about occlusions and can alter the perceived motion direction

Question 5

How does the brain resolve the ambiguity of motion in an aperture?

Answer 5

uses global motion detectors, particularly in the middle temporal lobe (MT), which contains neurons selective for motion in specific directions