OPT 205 - Perception > Psychophysical Methods > Flashcards

Psychophysical Methods Flashcards

(25 cards)

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1
Q

Psychophysics

A

the study of the relationship between perception and the stimulus

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2
Q

False Alarm

A

false positive

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3
Q

Miss

A

false negative

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4
Q

Sensitivity

A

how good a test is at getting a hit

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5
Q

Specificity

A

how good a test is at getting a correct rejection

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6
Q

Sensitivity + Misses

A

100% of disease distribution

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7
Q

Specificity + FA

A

100% of normal d

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8
Q

Large d’

A

better test

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9
Q

Correction for guessing

A

50% of 1-guess %

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10
Q

Method of Adjustment

A

subject adjusts stimulus intensity, size, contrast till just visible

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11
Q

Method of Adjustment Advantages

A

Quick and easy

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12
Q

Method of Adjustment Disadvantages

A

little control over subject ,criterion effect is strong

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13
Q

Method of Constant Stimuli

A

a predetermined series of stimulus magnitudes are presented at equal number of times, random order

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14
Q

Method of Constant Stimuli Advantages

A

subjects like, reveals entire psychometric function

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15
Q

Method of Constant Stimuli Disadvantages

A

many trails, inefficient

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16
Q

Method of Limits

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A

stimulus intensity is controlled by experimenter, ascending/descending

17
Q

Method of Limits Advantages

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A

requires fewer trials

18
Q

Method of Limits Disadvantages

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A

anticipation, perseverance, adaptation

19
Q

Staircase Method Advantages

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A

efficient in estimating thresholds

20
Q

Staircase Method Disadvantages

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A

can be frustrating, criterion bias

21
Q

Magnitude Estimation

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A

requires subjects to assign a number, quantify pathology

22
Q

JND

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A

the smallest difference that can be detected

23
Q

Weber’s Law

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A

JND is not constant

24
Q

Fechner’s Law

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A

assumed that all JNDs are perceptually equal

25
Steven's Law
JNDs are not all equal
OPT 205 - Perception
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