Note that the important point in Figure 1 is that the learning curve is completely flat until the adjustment point before the last error occurs, and there is a strong discontinuity at this point. It should be emphasized that, contrary to the learning curve shown in figure 1, when the data is collected in a group of subjects, the usual incremental learning curve. This is because individuals become air conditioners in different experiments, and the general interdisciplinary produces the usual incremental curve.