Psychophysical Methods

Question 1

Someone with a strict threshold will have what analysis?

Answer 1

1. High threshold
2. Low sensitivity
3. Low False Positives
4. High false negative

Question 2

Someone with a lax threshold will have what analysis?

Answer 2

1. Low threshold
2. High sensitivity
3. High false positives
4. Low false negatives

Question 3

This is the smallest level of stimulus necessary for an observer to detect its presence

Answer 3

Threshold

Question 4

What is the threshold measurement for VA?

Answer 4

MAR

Question 5

What is threshold influenced by?

Answer 5

1. Decision Criteria
2. Attention
3. Motivation
4. Internal Noise

Question 6

For the FOS curve, an ideal observer will be _____ and a real observer will be _____.

Answer 6

ideal = unambiguous
real = more ambiguous

Question 7

If a subject says they can’t see a stimulus above their threshold, this is determined what?

Answer 7

A miss

- false negative

Question 8

How do we minimize the importance of a patient’s criterion?

Answer 8

Forced Choice Method

Question 9

What is the threshold for forced choice?

Answer 9

75%

Question 10

Acuity of a patient with a strict criteria on a descending limits method will have acuity that is better or worse than it truly is?

Answer 10

Worse than it truly is