Fig. 3.

Five subjects’ attention filters, filter selectivity ratios, and filter efficiencies for 32 attention conditions. In all panels, the eight colored circles on the abscissa represent the eight colors in the particular set. (A) Four example target and achieved attention filters; each filter corresponds to a particular target color in one of the four stimulus sets: (a) hue set, (b) achromatic (Bl–Wh) set, (c) R–G set, and (d) Y–B set. Dashed and solid curves are target and the subject’s achieved filters. Filter curves are painted in the corresponding target colors. Error bars throughout Fig.3 represent 95% confidence intervals. (B) Attention filters of five subjects (separated in rows) for four sets of stimuli (separated in columns). Columns (from left to right) are hue set, Bl–Wh set, R–G set, and Y–B set. Within each panel, each colored curve corresponds to the achieved attention filter for that particular target color. Filter curves for all of the colors within a stimulus set are shown in one panel although they are derived from data collected in separate blocks of trials. (C) Mean filter selectivities (target/distractor filter weights) and efficiencies (fraction of targets used) averaged across five subjects. The colors of points are the corresponding target colors; the line colors are arbitrary.