2 - Visual Stabilization (Exam 1)

Question 1

Is the eye ever stationary during steady fixation?

Answer 1

No

It exhibits small eye movements called fixation eye movements

Question 2

What are the 3 theories of compensatory mechanisms?

Answer 2

1. Proprioceptive Theory
2. Efference Copy
3. Theory of velocity subtraction

Question 3

What is the proprioceptive theory?

Answer 3

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

Question 4

What is efference copy?

Answer 4

Feedback loop from the eye movement initiation centers to higher levels of perception
Voluntary movement of eyes

Question 5

What is the theory of velocity subtraction?

Answer 5

Any target velocity different from whole-world motion must be due to target motion