[Adaptation in a detector system and differential sensitivity]

It is shown, that if during adaptation the sensitivity of single detectors of the models (1) is constantly decreasing proportionally to the level of their excitation, then the differential sensitivity of the whole system to the stimulus near the adapting stimulus increase. The condition is deduced under which the perceived value of stimulus parameter is invarable during adaptation. Calculated from these conditions invariable values of line inclination, hue of the patch, are in agreement with experimentally obtained data.