chapter 2 Flashcards
(19 cards)
1
Q
psychophysical scale
A
- people rate their psychological experiences corresponding to level of physical stimulus
2
Q
method of limits
A
- stimuli presented in ascending or descending order
3
Q
absolute threshold
A
- smallest amount of a stimulus to be detected
4
Q
difference threshold (JND)
A
- smallest difference between 2 stimuli to detect a change
5
Q
crossover point
A
- point at which a person changes from detecting to not detecting and vice versa
6
Q
method of constant stimuli
A
- randomly presented stimuli above and below threshold
7
Q
method of adjustment
A
- participant controls the stimulus and adjusts it to be at threshold themselves
8
Q
point of subjective equivalence (PSE)
A
- settings at which 2 stimuli are perceived to be identical
9
Q
sensitivity
A
- ability to perceive a particular stimulus
- inversely related to threshold
10
Q
magnitude estimation
A
- participants assigning numerical estimates to the perceived strength of a stimulus
11
Q
response compression
A
- as the strength of a stimulus increases so does the perceptual response, but the perceptual response does not increase as much as the stimulus increases
12
Q
response expansion
A
- as the strength of a stimulus increases, the perceptual response increases even more
13
Q
catch trial
A
- trial no stimulus is presented
14
Q
forced choice method
A
- required to report when a stimulus occurs instead of whether it was percieved
15
Q
signal detection theory
A
- meaningful patterns or random patterns
16
Q
sensitivity (signal detection theory)
A
- ease/difficulty an observer can distinguish signal from noise
17
Q
d (dā prime)
A
- mathematical measure of sensitivity
18
Q
receiver operating characteristic (ROC) curve
A
- plot of false alarms vs hits for any given sensitivity
19
Q
masking
A
- difficulty in perceiving one stimulus when it is quickly replaced by a second stimulus in the same spatial location
