Figure 3
(A) Distribution of the proportion of difficult perceptual decision choices (option “5”) among the 32 subjects who performed the main version of the task. The striped (dotted) bar highlights subjects who chose the difficult option more (less) than 95% of the trials. (B) Distribution of the number of trials executed by the 32 subjects to earn 200 points and complete the session. Same convention as in (A). (C) Left panel: comparison of subjects’ decision accuracy as a function of perceptual difficulty (difficult: ordinate; easy: abscissa). Circles illustrate individual data. Black circles highlight subjects for which the difference between conditions is statistically significant (Chi-square test, p < 0.05). Right panel: comparison of subjects’ decision duration as a function of perceptual difficulty (difficult: ordinate; easy: abscissa). Crosses illustrate individual subjects’ medians ± SD. Black crosses highlight subjects for which the difference between conditions is statistically significant (rank-sum test, p < 0.05). (D) Effect of the number of completed trials on subjects’ movement accuracy (black) and on target size (violet). Trials are sorted chronologically and a normalization is performed by grouping them in 5 quantiles. The open circles show median values for each quantile of trials across the population. The filled dots show individual subjects’ data for each quantile of trials.
