Figure 5.

Typical results from experiment 3 in uv chromaticity coordinates. Solid white circle, background chromaticity; open white circles, gray settings from preliminary experiment; large black square, standard infield chromaticity. Each point within the triangle represents one of the test chromaticities. Points plotted as white squares represent test infields that appear equal in hue to the standard infield, those plotted as small black squares represent test infields that appear achromatic, and those plotted as small black dots represent test chromaticities that are judged to be neither achromatic nor a hue match. Chromaticity points for those test infields that appeared indistinguishable from the surround are omitted in the plot, yielding an empty region close to the white filled circle.