Lecture 3

Question 1

Methods of constant stimuli

Answer 1

Several intensities are systematically tested in a random order. It is the most accurate of the methods, but takes a long time.

Question 2

Methods of limits-ascending/descending

Answer 2

Ascending/descending cycles. There is a change in direction when there is a yes or a no. A bit less accurate (Because there is some overshoot in judgement). Some intensities still do not contribute much information

Question 3

Staircase method

Answer 3

-Go back as soon as there is a change in response. Faster than the method of limits, and almost as accurate.

Question 4

Method of adjustement

Answer 4

Let the participant increase, or decrease the intensity in order to find her/his threshold. Really fast, but not accurate

Question 5

Modulus

Answer 5

Comparison point that was assigned or standard stimulus

Question 6

Test stimuli

Answer 6

Comparison stimuli

Question 7

Perceived intensity

Answer 7

Number provided by the participants

Question 8

Absolute magnitude ratings

Answer 8

How intense is a percept in relation with 2 “absolute” boundaries

Question 9

Sensitivity (d’)

Answer 9

How well can you distinguish the signal from the noise? d’ ~=Hits-False alarm

Question 10

Receiver operating characteristic curves (ROC curves)

Answer 10

The graphical plot of hit rates, as a function of false alarm rates