The higher yes rates under weaker contextual contrasts C c are not expected from the assumption or expectation that neurons responding to the colinear context should increase the neural response to the target as if the target has an effective contrast C ef f ective t higher than the actual input contrast C t . If colinear facilitation did make C ef f ective t ¼ C t þ DC t , then the change DC t should depend on the contextual contrast C c by some function as DC t ¼ f(C c ) such that f(0) ¼ 0. Then, our Bayesian formulation should replace each C t in the right-hand side of Equation 1 by C ef f ective t . To the first order (linear) approximation, DC t ' cC c , where c is the coefficient of facilitation. We can then repeat our Bayesian fit with now an additional model parameter c. As expected, this gives a negligible fitted c ¼À0.5 3 10 À6 ' 0, giving jDC t j , 10 À5 for C c 0.4. Hence, no colinear facilitation or suppression of input sensitivities is needed to account for our data, or that our **data** do not indicate that colinear influence could change the effective contrast of the input.