Fig. 1. Stimuli from previous seminal studies of categorization.

The top row shows representative stimuli, the bottom shows the types of stimulus representations used as input to categorization models. Stimuli and category distributions reproduced to roughly replicate those used in the following studies: left¹⁷, center left²⁸, center right¹², right³⁰ (although for the center right panel, stimulus distributions were represented—and linearly separable—in four dimensions¹²).