Figure 8.

Stimuli used in Experiment 3. (A) Stimuli used in the complex and simple search tasks, depicted to scale (stimuli were white against a black background). Each set was composed of eight subsets of three shapes each. For each subset, subjects performed three complex searches in which each of the three shapes could be a target and the remaining two were the distracters. They also performed six simple searches, which consisted of all possible pair-wise searches involving the three shapes. (B) Parametric space for Set 2, which consisted of isosceles triangles that varied in curvature (convex-concave) and pointiness (ratio of height to width).