Stimulus sequence and behavioral results of Exp 1.

(A). Schematic representation of the stimulus sequence in a trial of Exp 1. In each trial, a standard (S1) and a comparison duration (S2) were presented in sequence. S1 could be one of four different durations (0.2, 0.4, 0.6, and 1 s). S2 could be either shorter or longer than S1 (Weber ratio was set to 0.4). Stimuli were sinusoidal Gabor patches varying in orientation. Orientation changes were task irrelevant. Participants were asked, by pressing one of two response keys, to judge whether the duration of S2 was shorter or longer than S1. (B) Group average (N = 11) of percentage of accuracy in the time task plotted separately for each of the four durations and as a mean of them (“overall accuracy,” rightmost bar; the gray dots are the different subjects). The data can be found in S1 Data. Error bars are standard errors. S1, first stimulus; S2, second stimulus.