Figure 7.

Pooling and substitution model parameters obtained in Experiment 2. (A, B, and C) Estimates of μ, σ, and ρ obtained from the pooling model in Equation 1 as a function of distractor presence (triangle symbols) and target–distractor differences (±15° and ±60°). (D, E, and F) Estimates of τ, σ, and ρ obtained from the substitution model in Equation 2 as a function of distractor presence (triangle symbols) and target–distractor differences. By definition, τ = 0 when there are no distractors in this display, so this condition has been omitted from (D). The estimate of σ for uncrowded trials in (E) was obtained via the pooling model, i.e., it is identical to the estimate shown in (B). Lines connected by squares correspond to “far” trials, and lines connected by circles correspond to the “near” trials. Error bars are 95% confidence intervals.