Appendices

Question 1

What did Fechner propose?

Answer 1

The method of adjustment and constant stimuli

Question 2

What is the method of adjustment?

Answer 2

Stimulus intensity is either increased or decreased until the stimulus can just be detected
Stimulus intensity is adjusted by the subject until it is just detectable

Question 3

What is the method of constant stimuli?

Answer 3

The experimenter presents 5-9 stimuli with different intensities in random order
The subject says yes or no to indicate whether or not they can detect the stimulus
-lowest never detected, highest always detected
-most accurate but time-consuming

Question 4

What did Weber do?

Answer 4

Measured the difference threshold

Question 5

What is the Weber fraction?

Answer 5

The ratio DL/Standard

Question 6

What is Weber’s law?

Answer 6

The fact that Weber’s fraction remains the same as the standard is changed
True for most senses as long as the stimulus intensity is not too close to the absolute threshold

Question 7

What is response compression?

Answer 7

When the increase in perceived magnitude is smaller than the increase in stimulus intensity

Question 8

What is response expansion?

Answer 8

As intensity increases, perceptual magnitude increases more than intensity

Question 9

What is Steven’s power law?

Answer 9

P(perceived magnitiude)=K(constant)S(stimulus intensity)^n

exponents<1 = compression
exponents>1 = expanision