Lecture 6 - Motion Perception

Question 1

How do we move our eyes? (4)

Answer 1

• Vergence movements
• Saccadic movements
• Pursuit movements
• VOR-Vestibular Ocular reflex

Question 2

What happens when we don’t move our eyes? (study)

Answer 2

Riggs et al. (1953)
Stabilised retinal images
*Participant wears contact lens with small mirror
*An image projected to the mirror is reflected onto a screen
*The image that the participant sees will move in line with their eye movements so that the image itself is always projected onto the same area of the retina

Question 3

What is akinetopsia?

Answer 3

Motion blindness
It can result from diseases such as Alzheimer’s or brain damage due to trauma or stroke.
Related to dysfunction with area MT/V5 responsible for motor detection.

Question 4

How does real physical movement elicit the perception of motion?

Answer 4

something in our environment really moves across our field of view.

Question 5

How does apparent motion elicit the perception of motion?

Answer 5

alternating or successively presented stimuli appear to be one moving stimulus.

Question 6

How does induced motion elicit the perception of motion?

Answer 6

It occurs when motion of one object causes a nearby stationary object to appear to move.

Question 7

How does motion aftereffects elicit the perception of motion?

Answer 7

It occurs when viewing a moving stimulus causes a stationary stimulus to appear to move in the opposite direction. Results from neural adaptation and rebound responses.

Question 8

What is kinetic depth?

Answer 8

Based on the motion parallax monocular depth cue.
Points of an object that are moving faster than others are perceived as closer, creating the illusion of 3D rotation.

Question 9

Outline the specialised brain area for biological motion.

Answer 9

A specialised network in the brain is responsible for perception of biological motion
*Primarily involves a small area of the superior temporal sulcus