The relative contribution of color and material in object selection
Fig 4
Results are shown for the best-fitting model for three observers (top row: observer dca; middle row: observer sel; bottom row: observer nkh). Left column. Recovered mean perceptual positions for our test stimuli. The coordinates of the target stimulus are fixed at the origin. Non-target color levels are shown on the x-axis. They are ordered from C-3 on the left to C+3 on the right. Non-target material levels are shown on the y-axis. They are ordered from M-3 on the bottom to M+3 on the top. Different circle colors (black, blue, green, red) indicate different levels of test-to-target difference in color (C) or material (M): zero deviation is plotted in black, small in blue, medium in green and large in red. Points corresponding to differences in the (nominally) negative direction are plotted as open circles, while those corresponding to the (nominally) positive direction are plotted as filled circles. The inferred color-material weight is indicated at the top left. Center column. Measured selection proportions are plotted against proportions predicted by the model. The area of each data point is proportional to the number of trials run for the corresponding stimulus pair. One probability is plotted for each stimulus pair. Only data for stimulus pairs that were presented more than once are shown. Right column. Color-material trade-off functions predicted by the model solution (see main text). Measured probabilities for a subset of trials shown in the experiment are plotted against predicted probabilities. Symbol color matches the corresponding color-material trade-off function. Data corresponding to a prediction are plotted if more than 10 trials were run for the stimulus pair. Open circles correspond to dashed-lines (M-3, M-2, M-1) and filled circles correspond to solid-lines (M+3, M+2, M+1).