Table 1.
Weibull psychometric function and summation model parameters for individual and combined photoreceptor-directed modulations
| Photoreceptor-directed stimuli (μ±SEM) |
Combination stimuli (μ±SEM) |
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|---|---|---|---|---|---|---|---|---|---|
| Melanopsin (i) | Rod (R) | LMS | i + R | i+ LMS | R + LMS | ||||
| 1 Hz | Weibull | 200 Td | α | 9.9±0.1 | 7.6±0.1 | 5.3±0.1 | 8.9±0.5 | 4.9±0.1 | 5.1±0.5 |
| β | 2.2 | 2.4 | 2.8 | 2.3±0.2 | 1.9±0.1 | 2.8±0.2 | |||
| 2000 Td | α | 10.2±0.3 | 7.7±0.0 | 4.64±0.3 | 8.7±0.3 | 3.8 | 5.0±0.5 | ||
| β | 2.1 | 2.5 | 2.9 | 2.7±0.1 | 2.3±0.1 | 3.0±0.1 | |||
| Summation | 200 Td | i = 0.2±0.1 r = 1.0±0.1 φr-i = 30.4° |
n = 0.9±0.0 | r = 0.6±0.0 c = 1.8±0.1 φc-r = 24.7° |
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| 2000 Td | i= 0.3 r = 1.2±0.1 φr-i = 45.7° |
n = 0.8±0.0 | r = 0.6±0.1 c = 1.9±0.1 φc-r = 28.1° |
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| 10 Hz | Weibull | 200 Td | α | 6.9±0.5 | 3.8±0.6 | 5.9±0.1 | 3.6±0.1 | 4.2±0.8 | |
| β | 2.5 | 3.2 | 3.0 | 3.0±0.1 | 2.4±0.1 | ||||
| 2000 Td | α | 7.7±0.3 | 3.3±0.3 | 6.2 | 2.9±0.1 | 4.2±0.8 | |||
| β | 2.5 | 3.2 | 2.9 | 3.2±0.2 | 2.5±0.1 | ||||
| Summation | 200 Td | n = 0.8±0.0 | n = 0.9±0.0 | r = 1.1±0.0 c = 2.3±0.0 φc-r = 163.4° |
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| 2000 Td | n = 0.8±0.0 | n = 0.8±0.0 | r = 1.2±0.0 c = 2.5±0.1 φc-r = 170.0° |
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μ, mean; SEM, Standard Error of the Mean; α, threshold (% Michelson contrast); β, slope; i, melanopsin; r, rods; c, LMS-cones; φ, relative phase difference; n, probability summation index in linear units (= 20∗log101/n dB).