Figure 7.

Parametric space versus search space in Experiment 2. (A) Stimuli shown in the parameter space used by Saumier and Arguin (2003). (B) A two-dimensional representation of these stimuli obtained from multidimensional scaling performed on the set of experimentally measured pair-wise search distances. Distances between pairs of shapes in this plot are roughly equal to the reciprocal of the average search time involving one shape among the other for 6 × 6 search displays. Stimuli L and M are depicted using filled dots for clarity. The original configuration in parameter space is considerably distorted in visual search space (compare panels A and B). These distortions explain the difference observed between LS and LNS searches (see text).