We obviously don't ask people to drive around and see how many car accidents they have. That would be a little costly proposition. But we design tasks on the computer where we can measure, to millisecond accuracy, how good they are at switching from one task to another.
Oczywiście nie każemy ludziom  powodować wypadków. To by za drogo wyszło. Tworzymy symulacje komputerowe, które, co do milisekundy, mierzą przejście z jednego zadania do drugiego.