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. 2001 Apr 15;21(8):2768–2783. doi: 10.1523/JNEUROSCI.21-08-02768.2001

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).