刘勰
Liu Xie conducted a psychology experiment by asking his subjects to draw a circle on a piece of paper with one hand, while the other hand tried to simultaneously draw a square. This test was to measure the level of distraction that could be managed by his subjects. As Liu observed, his students, who were the subjects of his experiment, struggled to perform both tasks simultaneously. What Liu's experiment had demonstrated was that by doing two experiments at once will mean that neither experiment is done correctly.