This document summarizes Kimberly Noels' research on language learning motivation. It discusses how motivation is defined according to self-determination theory and how it varies across learning contexts and cultures. The research examines motivation among Japanese and Swiss students learning English as a foreign language. It finds that autonomy, competence, and relatedness predict self-determined motivation in both cultures, supporting the cross-cultural validity of self-determination theory. The research emphasizes the importance of taking a dynamic perspective on motivation that considers how motivational factors influence each other over time.