Table 1.
Phosphor values and cone activities of the high cone-contrast cone-isolating stimuli
(+) State | (−) State | |||||
---|---|---|---|---|---|---|
L/R | M/G | S/B | L/R | M/G | S/B | |
L-isolating | ||||||
Relative gun | 100 | 0 | 0 | 0 | 31.4 | 0.32 |
Relative cone | 12975 | 2646 | 246 | 4150 | 2646 | 246 |
Gun (cd/m2) | 44.32 | 0 | 0 | 0 | 18.9 | 0.08 |
Gun (0–255) | 255 | 0 | 0 | 0 | 156.8 | 55 |
Cone activation | 130.955 | 27.054 | 2.652 | 43.484 | 27.128 | 2.679 |
Final gun | 255 | 0 | 0 | 0 | 154 | 38 |
M-isolating | ||||||
Relative gun | 0 | 100 | 0 | 100.7 | 0 | 2.005 |
Relative cone | 13166 | 8381 | 605 | 13166 | 2756 | 605 |
Gun (cd/m2) | 0 | 59.63 | 0 | 44.32 | 0 | 0.51 |
Gun (0–255) | 0 | 254.3 | 0 | 255 | 0 | 62.6 |
Cone activation | 131.143 | 83.479 | 6.043 | 131.312 | 27.500 | 6.003 |
Final gun | 0 | 252 | 0 | 255 | 0 | 55 |
S-isolating | ||||||
Relative gun | 64 | 0 | 255 | 0.9011 | 160.2 | 0 |
Relative cone | 21216 | 13454 | 45566 | 21216 | 13454 | 0.0971 |
Gun (cd/m2) | 11.12 | 0 | 25.6 | 0.157 | 37.735 | 0 |
Gun (0–255) | 143.6 | 0 | 255 | 56.3 | 211.1 | 0 |
Cone activation | 86.903 | 54.218 | 181.625 | 87.141 | 54.628 | 3.933 |
Final gun | 148 | 0 | 255 | 52 | 209 | 0 |
Each cone-isolating stimulus (L-isolating, M-isolating, and S-isolating) consisted of two states, (+) and (−), such that between the two states only the desired class of cones was modulated. Relative phosphor (R, G, or B) and cone activities (L, M, or S) were derived (see Materials and Methods), and these were then normalized [gun (cd/m2)] and converted to standard 0–255 values [gun (0–255)] using the gun luminance functions (Fig. 2). These were empirically tested and adjusted appropriately to produce the gun and cone activities of the stimuli as they appeared to the monkeys (values in bold).