Introduction

Question 1

Absolute threshold

Answer 1

Smallest amount of energy needed to detect stimulus

Question 2

Psychophysics

Answer 2

Study of the relationship between stimulus and perception

Question 3

Name the four psychophysical methods in order of increasing objectivity

Answer 3

Method of adjustment
Method of limits
Modified method of limits
Method of constant stimulus

Question 4

Crossover point

Answer 4

Point at which stimulus becomes perceptible or loses perceptibility

Question 5

How does the modified method of limits differ from its parent method?

Answer 5

Uses staircase procedure, including interleaved staircases

Question 6

Psychometric function

Answer 6

Y-axis - percent Ys

X-axis - stimulus intensity

Question 7

Relate precision and accuracy to the psychometric function

Answer 7

Precision - slope

Accuracy - threshold (x-value at 50% Ys)

Question 8

Problems with phenomenology

Answer 8

Poor control over stimulus
Cannot repeat observations easily
Introspective reports not always reliable

Question 9

Advantages (3) and disadvantage of method of constant stimuli

Answer 9

Provides more information
Less biased
Can measure accuracy and precision
Cannot measure bias

Question 10

Fechner’s psychophysical methods

Answer 10

Adjustment
Limits
Constant stimuli

Question 11

Weber’s Law

Answer 11

JND = KS

Question 12

Power function

Answer 12

P = KS^n

Question 13

Types of visual search paradigms

Answer 13

Easy feature search
Diffucult feature search
Conjunction search

Question 14

Types of reaction time attributes

Answer 14

Pre-attentive

Attentive