The research focused on each school subject and its teaching is called subject didactics. Media education is not a subject of its own in Finnish primary schools, but you can however analyse the subject didactics of media education. This relates to my earlier entry about teacher’s pedagogical content knowledge.
Here’s a summary of an article accepted to ‘Ainedidaktinen symposiumi’ publication 2006, which is due to be out in January 2007. >> summary in Finnish