Fig. 4.

Spatial frequency effectiveness in binocular combination of added noise, i.e., the noise modulation transfer function. One eye is presented a pure sinewave grating f_s = 0.68 cpd; the other eye is presented a grating in which the sinewave phase is shifted by 90° and to which a 2D bandpass noise is added. The ordinate shows the relative contribution to gain-control b(f_s,N) of the added noise (as derived from model 3); the abscissa shows the center spatial frequency f_s,N of the noise. Inserted icons illustrate stimuli used in experiment 2 for signal-to-noise ratio equals 2.