1
Q
Is the eye ever stationary during steady fixation?
A
No
It exhibits small eye movements called fixation eye movements
2
Q
What are the 3 theories of compensatory mechanisms?
A
- Proprioceptive Theory
- Efference Copy
- Theory of velocity subtraction
3
Q
What is the proprioceptive theory?
A
Feedback from muscle stretch receptors provide information to higher levels of perception to recalibrate local sign
-Fairly weak signal
Any movement of eyes, voluntary or involuntary
4
Q
What is efference copy?
A
Feedback loop from the eye movement initiation centers to higher levels of perception
Voluntary movement of eyes
5
Q
What is the theory of velocity subtraction?
A
Any target velocity different from whole-world motion must be due to target motion
