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. Author manuscript; available in PMC: 2013 Sep 19.
Published in final edited form as: J Vis. 2006 Oct 13;6(11):1159–1171. doi: 10.1167/6.11.2

Figure 3.

Figure 3

The left column in each panel shows log sensitivity versus stimulus radius for individual filter-elements at different offsets from the stimulus center. The black curve shows the tuning function for the filter-element centered on the stimulus. The dashed vertical line indicates the stimulus radius corresponding to 1/2 cycle of the peak spatial frequency. The right column in each panel shows reconstructed spatial summation functions for single mechanisms with filter-element (F-E) tuning functions scaled vertically to represent effects of probability summation; at the top of each figure, the asterisks show the number of filter-elements responding to each stimulus size. The filled circles are the probabilistic sums of the sensitivities of the filter-elements. The black curve shows the function for the filter-element centered on the stimulus. The dashed vertical line indicates the critical area. See text for details.