Figure 5. Cancellation of global stimulus with feedback saturation.

(A) Model predictions of the level of cancellation of global signals as a function of contrast, for different signal AM frequencies (colored lines) and different learning contrasts considered (different panels). We have introduced here a factor which takes into account the saturation of the feedback pathway for high stimulus contrasts. The gray line indicates the frequency-average cancellation levels measured experimentally (from data in Fig. 1C). (B) Degradation level (defined as the quantity , once frequency is averaged) as a function of the contrast for different learning contrasts (red , green , blue , violet ). Symbols denote experimental data. As we can see, the optimal learning contrast is around .