In Web study, a learner studies alone toward a personal computer. Therefore, the learner cannot see the appearance of the other learners, and cannot receive the appropriate advice from teachers. Therefore, it is difficult to maintain and to improve the incentive to learn. To give a learner a sense of accomplishment is one of the methods to maintain the incentive to learn. For this, a Web learning system should give the learner a moderately difficult problem (problem let him feel that he can do it if he does his best a little more). To do this, the system should automatically measure the learner’s understanding level accurately. So far, there are a couple of methods to grasp learner’s level, e.g. Item response theory and SP score table analysis, etc. However, a lot of data are necessary for the analysis in such methods. And, it is difficult to deal with a new problem. In psychology, it is said that there is a blink to follow to the change in feelings besides a physiological blink. In this paper, we thought that the feelings change can be known by the frequency change of the blink, and tried to measure the frequency of the blink in real time. Furthermore, it is tried to clarify the relation to the learner’s understanding level by comparing the result of the problem.
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