Figure 3.

Performance in all experimental conditions and modulation of numerical stimuli in the number prime and the “1–5–9” conditions. Performance in the three time discrimination conditions is described in terms of accuracy, just noticeable difference (JNDs), and point of subjective equality (PSE) for DD and control participants. Asterisk indicate statistical significance for the difference between the two groups of participants or between stimuli (i.e., “1” vs. “9” prime conditions). Values on the y-axis indicate how much longer (positive) or shorter (negative) a stimulus had to be displayed in order to be perceived as different from the reference stimulus (JNDs) or of the same duration of the reference stimulus (PSEs).