Motion

Question 1

What are the 6 functions of motion perception?

Answer 1

1. Determines the motion of an object
2. Attract attention
3. Figure-background segmentation
4. Estimate depth
5. Infer 3D structure
6. Infer action

Question 2

What is ego motion?

Answer 2

Induced by motion of observer

Question 3

What is object motion?

Answer 3

Movement of objects

Question 4

What is apparent motion?

Answer 4

When stationary objects appear to move

Question 5

What is biological motion?

Answer 5

Motion of living things

Question 6

What is motion parallax?

Answer 6

The depth from motion

Question 7

What is motion after effect?

Answer 7

When stationary objects appear to be moving after prolonged exposure of movement

Question 8

What are the components of motion?

Answer 8

Movement and direction

Question 9

What does motion after-effect imply?

Answer 9

That vision involves:

• Opponent processing
• Interocular transfer (transfer of info from both eyes to V1)

Question 10

What is optic flow?

Answer 10

• flow field induced by motion on the retina

- differ when the person moves and object moves

Question 11

How is motion related to orientation?

Answer 11

Motion is orientation in time

Question 12

What are the 2 problems faced when detecting motion?

Answer 12

Correspondence - Which features in frame 2 correspond to frame 1
Aperture - Direction of local figure might be ambiguous depending on apperture

Question 13

What is saccadic suppression?

Answer 13

The reduction of visual sensitivity that occurs when one makes a saccadic eye movement

• One copy of signal goes to eye muscles
• Other copy goes to ‘comparator’ which compensates for image changed caused by eye movement

Question 14

What is akinetopsia?

Answer 14

Individual has no perception of motion