Discourse analysis of post-war Japanese prime ministers’ general policy speeches indicates that speeches made during the early post-war period include a high ratio of mental process clauses, representing experience as the internal processes of their perception and cognition (feeling, thinking). In the later post-war period, however, the ratio of material process clauses, by means of which PMs referred to experience of the external world and described the process of physical actions (doing), increased. In order to provide an explanation of why this change occured, multiple regression analysis was conducted. Our main findings suggest that (i) during the high economic growth period, the spread of the media was the most influential factor, followed by economic fluctuations; (ii) during the transition period, similarly, the impact of the media was strongest, and after that the economy; (iii) during the period of economic stagnation, along with the media as the most controlling factor, a surge in independent voters became a significant factor. This study offers empirical evidence that post-war Japanese PMs have come to exhibit a growing awareness of the need for accountability and the dissemination of the media has been the constantly dominant factor in this change.
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