Kelly J T, Kelly G N
Percept Mot Skills. 1977 Jun;44(3 Pt 1):724-6. doi: 10.2466/pms.1977.44.3.724.
Understanding of the principle of horizontality was tested by having 314 university students draw the water surface on pictures of tilted bottles. Adults appear to have difficulty with this task and females performed much more poorly than males.
通过让314名大学生在倾斜瓶子的图片上画出水面来测试他们对水平原理的理解。成年人在这项任务上似乎存在困难,而且女性的表现比男性差得多。