Fig. 1.

Procedure of the experiment for both numerosity and duration judgement tasks. For the numerosity judgement task, the number of dots varied between the two sets (n = {30, 32, 34, 36, 38}) but they were presented for the same duration (t = 1000 ms). For the duration judgement task, the number of dots was kept constant (n = 34) but the duration of presentation of each set changed (t = {800 ms, 900 ms, 1000 ms, 1100 ms, 1200 ms}). The diameter of dots was controlled in such a way that the overall covered surface was constant between the two sets. Stimulation was initiated 100 ms before the onset of the second set.