Abstract
One of the factors of good explanation is that the listener's understanding is confirmed. Therefore, we focused on ocular information as an objective index to grasp the comprehension status. It has been suggested that blinking affects psychological load. Pupil diameter has been suggested to affect the cognitive load to comprehend sentences. In this study, we evaluated the influence of ocular information on the degree of comprehension during listening to sentences composed of unknown and known words. In addition, a subjective evaluation questionnaire was administered to listeners to evaluate their comprehension of the sentences they heard. The results showed that the blink rate after listening to a sentence was significantly higher and the pupil diameter was significantly mydriatic when the comprehension level of the sentence was low. Furthermore, the accuracy of estimating the listener's comprehension level from their eye information was estimated by SVM which is categorized in machine learning. According to the result, we found out that the accuracy of estimating the comprehension level was 70% and that of estimating the ease of comprehension was over 60%. Therefore, it is suggested that it is possible to estimate the listener's comprehension level by using their eye information.
