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Density discrimination performance by a simulated observer that performed as illustrated in Figure 6. Details of the simulation are described in the text and Appendix. The horizontal axis indicates the objective density of the trial (Levels 1–20 Sparse; Levels 22–41 Dense). The open triangles and diamonds, respectively, show the proportion of Sparse and Dense responses. The filled circles show the proportional use of the third, aversion-avoidance response.
