lecture 6 - motion perception

Question 1

how do we move our eyes?

Answer 1

Muscles to pull our eyes in different directions - they can also rotate our eyes
Abducens nerve pulls the eye out

Question 2

how do we move our eyes?

Answer 2

1 - vergence - movement of each of our eyes which keeps the focus when we move objects closer or further away
Divergence - when moving away from us
2 - saccadic - fast movements of both eyes, rapidly between 2 parts of a scene - no control of speed of the saccade
3 - pursuit movements - movements we make to keep out phobia focussed on a moving object
4 - VOR - involuntary reflex, stabilises the image on the retina despite head movement

Question 3

what happens if we dont move our eyes - Riggs?

Answer 3

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
To begin with, the images appear normal
Within a few seconds, however, they begin to fade
After a short time, images can not be seen at all

Question 4

what is a blind spot?

Answer 4

spot in our retina where there are no photoreceptors

Question 5

what are eye movements during fixation?

Answer 5

micro saccades (small, rapid eye movements), drift (Randomly occurring, slow, irregular, smooth-motion eye movements) and tremor

Question 6

what is akinetopsia?

Answer 6

Motion Blindness

Question 7

what elicits the perception of motion?

Answer 7

real physical movement, apparent motion, induced motion and motion aftereffects

Question 8

what are perceptual organisation of moving objects?

Answer 8

structure from motion, motion induced blindness, motion capture, kinetic depth, bio motion