The comparative adequacy of the method of limits, the method of constant stimulus differences, and the method of adjustment was studied by using three criteria suggested by Blackwell. It was concluded that the method of constant stimulus differences was the most adequate and the method of adjustment the least adequate for determining sensitivity to color differences.
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Standard deviations for all observers in two sessions of each method.a
Method
Limits
Adjustment
Constant Stimulus Differences
Yel.
Red
1st
2nd
Yel.
Red
Obs.
ses.
ses.
50
50
ses.
ses.
FD
85.0
80.0
105.2
114.1
70.0
80.0
MC
50.0
55.0
62.6
102.5
45.0
32.5
JK
60.0
65.0
56.1
84.5
72.5
60.0
CC
80.0
90.0
147.6
208.0
80.0
90.0
MS
47.0
65.0
122.4
111.3
62.5
72.0
HP
47.5
45.0
168.2
120.3
52.0
75.0
RL
130.0
100.0
161.3
167.3
105.0
110.0
AR
60.0
65.0
87.2
79.6
65.0
65.0
Means
69.9
70.6
113.9
123.5
69.0
73.1
The values in this table are reported in terms of the setting of the monochromator in mm ×10−2. In the method of limits and the method of constant stimulus differences, Yel. session refers to the condition in which the wavelength of the variable stimulus was shorter than that of the standard while Red session refers to the condition in which the wavelength of the variable stimulus was longer than that of the standard. In the method of adjustment, 1st 50 refers to the first 50 “matches” while 2nd 50 refers to the second 50 “matches.”
Table II
Summary of variance analysis of standard deviations for all observers for each method.
Significant at 0.08 level of confidence.
Significant beyond 0.01 level of confidence.
Tables (4)
Table I
Standard deviations for all observers in two sessions of each method.a
Method
Limits
Adjustment
Constant Stimulus Differences
Yel.
Red
1st
2nd
Yel.
Red
Obs.
ses.
ses.
50
50
ses.
ses.
FD
85.0
80.0
105.2
114.1
70.0
80.0
MC
50.0
55.0
62.6
102.5
45.0
32.5
JK
60.0
65.0
56.1
84.5
72.5
60.0
CC
80.0
90.0
147.6
208.0
80.0
90.0
MS
47.0
65.0
122.4
111.3
62.5
72.0
HP
47.5
45.0
168.2
120.3
52.0
75.0
RL
130.0
100.0
161.3
167.3
105.0
110.0
AR
60.0
65.0
87.2
79.6
65.0
65.0
Means
69.9
70.6
113.9
123.5
69.0
73.1
The values in this table are reported in terms of the setting of the monochromator in mm ×10−2. In the method of limits and the method of constant stimulus differences, Yel. session refers to the condition in which the wavelength of the variable stimulus was shorter than that of the standard while Red session refers to the condition in which the wavelength of the variable stimulus was longer than that of the standard. In the method of adjustment, 1st 50 refers to the first 50 “matches” while 2nd 50 refers to the second 50 “matches.”
Table II
Summary of variance analysis of standard deviations for all observers for each method.
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