Figure 19.

(A) The DSKL model with added binocular contrast gain control after binocular combination. (B) Model simulation of contrast discrimination at a spatial frequency of 0.68 cpd when (1) both test and pedestal are in the DE (dashed blue); (2) both test and pedestal are in the NDE (dashed red); (3) test is in the DE but pedestal is in the NDE (solid blue); (4) test is in the NDE but pedestal is in the DE (solid red); (5) test and pedestal are in both eyes (solid black). Model parameters for DSKL come from the preceding article for normal observer KT and from Table 2 for observers GD, GJ, and PB, and the parameters for binocular contrast gain control are from Meese et al. (2006) with p = 2.76, q = 2.34, z = 4.59, and σ = 0.212. (C) Attenuation effect from model simulation of contrast discrimination when attenuation is fixed at 0.25 for all four observers. Other model parameters are the same as in (B).