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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Vision Res. 2015 Jan 10;116(0 0):179–193. doi: 10.1016/j.visres.2014.12.019

Figure 4. Single-target categorization task by Shen and Ma.

Figure 4

(A) Trial procedure. Each display contains four items, of which three have a common orientation; these are the distractors. Subjects report whether the fourth item (the target) is tilted to the left or to the right with respect to vertical. (B) On each trial, the target orientation and the common distractor orientation are independently drawn from the same Gaussian distribution with a mean of 0° (vertical) and a standard deviation of 9.06°. For plotting, we divide orientations into 9 quantiles. (C) Proportion of reporting “right” as a function of target and distractor orientation, averaged over 10 subjects. (D) Model fits to the data in (C). (E) Proportion of reporting “right” as a function of target orientation (left column) and distractor orientation (right column). Circles and error bars: mean and s.e.m. of data. Shaded areas: mean and s.e.m. of model fit. Numbers above plots in (D) and (E) represent root-mean-square differences between data and model, averaged over subjects. The model fits are based on the stimuli actually presented in the experiment; therefore, apparent discontinuities are due to stimulus variability, rather than simulation noise.