Figure 9.
Sensitivity of rod limit to increased noise and limits in retinal processing. A, Rod limit contours calculated for a 160-μm-diameter receptive field with (thin trace) and without (thick trace) additive noise with an SD of 4σd (see Eq. 3). B, Rod limit contours with (thin trace) and without (thick trace) high-pass filtering and added noise with SD of 0.2σd. The impulse response of the filter is indicated in the inset. C, Rod limit contours with (thin trace) and without (thick trace) a threshold that eliminated rod pool responses smaller than 0.08 Rh*/rod. D, Sensitivity of rod limit contours to increases in each source of rod noise.