Motivational regulation in Japanese undergraduates

Learners need to effectively regulate their own motivation for learning because it is hard to always maintain a high level. In the field of self-regulated learning, the aspect of such a regulation process in learning is treated as "motivational regulation". How do Japanese undergraduates regulate their own motivation for lerning to maintain a high level? What kind of strategy for motivational regulation influences learning process positively or negatively? You can find answers of these questions in this book.