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The research examines possible differences in the mutual reinforcement (i.e. multiplicative) effect between intrinsic and instrumental motivation on academic performance across different cultures. Eight representative countries and economies from two large‐scale databases—the Trends in International Mathematics and Science Study (TIMSS) 2011 and the Programme for International Student Assessment (PISA) 2012—were used, respectively. Results showed that among the Confucian economies, instrumental motivation was more helpful in improving the mathematics performance of students with low intrinsic motivation than for those with high intrinsic motivation. This was shown by the multiplicative effect between intrinsic and instrumental motivation. Despite the difference, students in both Confucian and Western cultures with high intrinsic motivation had better mathematics performance than students with low intrinsic motivation. [ABSTRACT FROM AUTHOR]

This research examined the possible long-term effects of autonomous motivation on educational outcomes in the large scale High School Longitudinal Study 2009 (HSLS:09) data. We used a three-wave cross-lagged model to examine the longitudinal effects of intrinsic and identified motivation on 18,132 students in the mathematics domain and 16,684 students in the science domain. The results showed that intrinsic motivation was a long-term and effective enhancement agent on the subsequent academic performance, self-efficacy, identity, and course effort. In contrast, identified motivation might be sensitive to the contexts and was thus vulnerable to change in the long-term effects. Though identified motivation has positive effects on some immediate educational outcomes and is often regarded as "helpful" motivation, its positive effect is probably short-lived and might not last long in real life educational settings. [ABSTRACT FROM AUTHOR]