Figure 7: Behavioural signatures of time-dependency under mild speed pressure.

(a) Conditional accuracy function, proportion of missed deadlines and estimated accuracy at deadline in a context of mild deadline-induced speed pressure. Subjects performed the random dot motion task at a single level of discrimination difficulty. For the conditional accuracy functions, points indicate mean accuracy of trials sorted by RT into 22 equal-sized bins and line shows the mean of the best fits of piece-wise logistic regressions to each subject’s single-trial data. Error bars and shaded areas indicate ±s.e.m. of data points and regression lines, respectively. Box plots show the sample median (centre line), interquartile range (box) and full range (whiskers). (b) Equivalent plots from a second study in which subjects performed under two levels of discrimination difficulty.