Figure 7.

Response surface F(X, Y) and the coefficient of variation. (A) The (population-average) response surface F(X,Y) generated by the competitive model with the change of variable, Eqn. (8). (B) The measured coefficient of variation CV = σ/μ in lux activation of individual cells declines at higher activation levels. Relative activation is defined as (F-min(F))/(max(F)-min(F)). The dashed line shows a linear fit, used to parameterize CV in the calculation of the mutual information I(F; (X, Y)).