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.
Claro que non lle pedimos  á xente que conduza para ver cantos accidentes teñen. Iso sería un tanto caro. Pero deseñamos probas de ordenador coas que medimos, con precisión  de milisegundos o bos que son cambiando  dunha tarefa a outra.