Table I
The arcs vs. the stimulus in I.C.I. trilinear coordinates, x, y, z. n=20.
Stim. | R | Y | A | G | B |
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x | y | z | x | y | z | x | y | z | x | y | z | x | y | z |
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| 0.636 | 0.342 | 0.022 | 0.551 | 0.409 | 0.040 | 0.452 | 0.392 | 0.156 | 0.390 | 0.533 | 0.077 | 0.177 | 0.055 | 0.768 |
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Arcs | | | | | | | | | | | | | | | |
D | .230 | .102 | .668 | .239 | .123 | .638 | .223 | .127 | .650 | .218 | .167 | .614 | .183 | .067 | .750 |
F | .353 | .129 | .518 | .342 | .138 | .520 | .293 | .105 | .602 | .278 | .139 | .583 | .201 | .067 | .732 |
H | .257 | .102 | .641 | .271 | .110 | .619 | .265 | .118 | .617 | .230 | .090 | .680 | .229 | .089 | .682 |
N | .287 | .112 | .601 | .265 | .108 | .627 | .262 | .115 | .623 | .248 | .096 | .656 | .204 | .073 | .723 |
P | .248 | .121 | .631 | .243 | .102 | .655 | .267 | .152 | .581 | .249 | .113 | .638 | .215 | .091 | .694 |
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M | .275 | .113 | .612 | .272 | .116 | .612 | .262 | .123 | .615 | .245 | .121 | .634 | .206 | .077 | .716 |
Table II
Possible variations of measures of arcs and stimulus in I.C.I. trilinear coordinates, x, y, z.
Stim. | R | Y | A | G | B |
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x | y | z | x | y | z | x | y | z | x | y | z | x | y | z |
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| 0.002 | 0.002 | 0.000 | 0.000 | 0.000 | 0.000 | 0.003 | 0.003 | 0.006 | 0.001 | 0.001 | 0.000 | 0.000 | 0.000 | 0.000 |
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Arcs | | | | | | | | | | | | | | | |
D | .014 | .024 | .037 | .013 | .026 | .038 | .023 | .041 | .064 | .020 | .049 | .069 | .018 | .019 | .037 |
F | .005 | .005 | .000 | .018 | .001 | .028 | .006 | .001 | .007 | .004 | .029 | .026 | .016 | .008 | .024 |
H | .000 | .004 | .005 | .011 | .014 | .026 | .010 | .008 | .002 | .012 | .010 | .022 | .002 | .001 | .001 |
N | .009 | .006 | .015 | .008 | .005 | .013 | .008 | .010 | .017 | .010 | .005 | .015 | .003 | .004 | .008 |
P | .041 | .016 | .056 | .029 | .018 | .047 | .030 | .025 | .055 | .029 | .017 | .045 | .023 | .052 | .075 |
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T | .020 | .007 | .027 | .009 | .011 | .019 | .006 | .008 | .015 | .007 | .015 | .022 | .004 | .004 | .007 |
Table III
The arcs vs. the stimulus in dominant wave-length λ, Troland’s photon, I, and spectral excitation purity, P. n=100.
| λ | I | P | λ | I | P | λ | I | P | λ | I | P | λ | I | P |
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Stim. | 607 | 242 | .93 | 591 | 192 | .88 | 587 | 151 | .54 | 565 | 72 | .77 | 450 | 22 | .89 |
Arcs | 564c | .76 | .76 | 565c | .68 | .74 | 566c | .80 | .70 | 568c | .76 | .67 | 570c | .44 | .78 |
Table IV
Relative frequency of the arcs vs. the photon value of the A stimulus near the absolute threshold. n=40. Subject N.
A Stimulus, I | 0.4 | 0.8 | 1.6 | 2.4 | 3.2 | 4.0 | 4.8 | 5.6 |
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Rel. freq., total | 0.025 | 0.150 | 0.400 | 0.525 | 0.825 | 0.900 | 0.850 | 0.925 |
Rel. freq., hueful | | | | | 0.075 | 0.200 | 0.175 | 0.400 |
Table V
The reported hue of the arcs vs. the A stimulus in photons, I, and relative to the absolute threshold of the arcs, RL. n=10. Subject N.
A stimulus | Reported hue |
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I | I/RL | gy | Rgy | Ygy | Bgy | B | V | P |
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2.2 | 1.04 | 8 | | 1 | 1 | | | |
4.9 | 2.3 | 6 | | 1 | 2 | 1 | | |
6.0 | 2.8 | 7 | | | 1 | 1 | | 1 |
7.6 | 3.6 | 3 | | | 6 | 1 | | |
9.2 | 4.4 | | | | 6 | 2 | 1 | 1 |
15 | 7.1 | 1 | | | 5 | 2 | | 2 |
22 | 10 | 2 | | | 1 | 2 | 2 | 3 |
63 | 30 | | | | | | 2 | 8 |
130 | 62 | | | | | 1 | 2 | 7 |
170 | 81 | | | | 1 | | 5 | 4 |
400 | 190 | | | | | 3 | 4 | 3 |
600 | 280 | | | | | 2 | 3 | 5 |
1000 | 470 | | | | | 2 | 5 | 3 |
1500 | 710 | | | | | | 5 | 5 |
2300 | 1100 | | | | | 2 | 4 | 4 |
3900 | 1900 | | | | | 8 | 1 | 1 |
5500 | 2600 | | | | 1 | 7 | | 2 |
10000 | 4700 | 1 | 1 | | 1 | 6 | | 1 |
15000 | 6200 | | 1 | | 2 | 4 | | 3 |
21000 | 10000 | 2 | | 2 | 3 | 2 | | 1 |
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Total | 30 | 2 | 4 | 30 | 46 | 34 | 54 |
Table VI
Measures of the duration of the arcs, with their possible variations in seconds, vs. the R stimulus in photons. n=10.
Stim. | Surround at 0.07 Photon | Surround at Zero |
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35 | 175 | 700 | 1750 | 35 | 175 | 700 | 1750 |
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Arcs | | | | | | | | |
D | 0.38(0.08) | 0.43(0.02) | 0.45(0.08) | 0.57(0.23) | 0.37(0.08) | 0.35(0.02) | 0.41(0.08) | 0.73(0.27) |
F | .75(.17) | .67(.08) | .73(.14) | .76(.13) | .75(.09) | .70(.11) | .77(.11) | .83(.11) |
H | 1.13(.07) | 1.21(.30) | 1.17(.21) | 1.04(.11) | 1.51(.22) | 1.41(.23) | 1.32(.25) | 1.02(.17) |
P | .77(.29) | .86(.25) | .67(.23) | .64(.14) | 1.07 (.37) | 1.28(.30) | .91(.27) | .72(.25) |
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M | .76(.15) | .79(.16) | .76(.15) | .75(.15) | .93(.19) | .94(.22) | .85(.18) | .83(.20) |
Table VII
Subjective estimates, in percent of maximum, of the brilliance of the arcs following various exposures, in minutes, to darkness and light. n=10.
Darkness | 60 | | 30 | | 15 | | 10 | | 5 | | min. |
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Light | | 5 | | 5 | | 5 | | 5 | | 5 | indef. |
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Observer | | | | | | | | | | | |
D | | | 32 | 74 | 18 | | 20 | 86 | 18 | | 98 |
F | 0 | | 32 | 68 | 32 | 78 | | | | | 76 |
H | 0 | 74 | 20 | 68 | | | | | 32 | 54 | 74 |
P | 2 | 42 | 8 | 46 | | | | | 20 | 54 | 86 |
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M | 1 | 58 | 23 | 64 | 25 | 78 | 20 | 86 | 23 | 54 | 84 |