We ran 12 people in total so far, but for two of them we did not get any data. What happened was that both of the problematic cases ended with the math session while participants were running out of time. when the time limit was up (or close), a small window popped up on the screen saying "run time error" (at least for one of the two cases) and when the participant clicked "OK" on that small window, it automatically closed Medialab, and none of the data from any one of the three tasks were saved in the "data" folder.