2019 Volume 32 Issue 2 Pages 82-95
National Institute for Japanese Language and Linguistics (NINJAL) is conducting continuous linguistic survey in Tsuruoka-City. Sounds are one of the research items. Paying attention to the percentage of those who use nasal ga, we performed real time comparison. It turned out that the nasal ga is on the decline in the meantime. However, observing the cohort (the same birth group), it turned out that there is not a big change. This shows that the cause of declines of nasal ga mainly depends on a constituent's exchange. It seems that there are few people who changed their pronunciation. In order to make this clear, we analyzed also the data of the panel survey. It was claryfied that it is generally right. Paying attention to the same year-of-birth layer, we compared the difference of continuous survey with that of the panel survey. It turned out that there is a difference in about ten percent. We examined the reason which brought such a result. We guess that the respondent of a panel survey contain strong normative consciousness for language more than average. If that is truth, the panel survey is very useful at the point that we can grasp the existence of an individual change certainly. However, in grasping a numerical value, there may be a limit.
