Motivation and Academic Achievement

Abstract

Motivation has long been considered an important predictor of academic achievement, yet the mechanisms through which motivation translates into achievement remain insufficiently understood. This dissertation examines the motivation–achievement cycle, with particular attention to the mediating role of effort. The central research question is: To what extent, and under what conditions, does motivation influence academic achievement through effort? Across five empirical studies, the dissertation addresses three key gaps in the existing literature: limited empirical evidence on the mechanisms underlying the motivation–achievement cycle, an overreliance on Western, Educated, Industrialized, Rich, and Democratic (WEIRD) and K–12 samples, and methodological ambiguity arising from different approaches to longitudinal modelling. Chapter 2 examines the long-term relationships among value of education, time investment, and academic achievement using a five-year longitudinal dataset of 3,445 East-Asian junior-high students. Reciprocal effects between motivation and achievement emerged in the traditional cross-lagged panel model, but when stable between-person differences were accounted for, achievement predicted subsequent motivation whereas motivation did not predict subsequent achievement. Time investment was negatively associated with achievement and did not mediate the motivation–achievement relationship. Chapter 3 shifts to short-term situational motivation and examines prospective and retrospective interest and time investment across 15 measurements among 323 college students. Retrospective, but not prospective, interest predicted time investment, while proximity to examinations strongly increased effort regardless of interest. Chapter 4 investigates changes in expectancy–value beliefs across seven weekly measurements among 436 college students. Intrinsic and utility value declined during the transition into higher education and showed limited recovery, while growth mindset was modestly associated with a smaller decline in expectancy. Chapter 5 examines expectancy–value beliefs, quantity and quality of effort, and academic achievement across nine weekly measurements among 211 undergraduate students. The findings further demonstrate that temporal relationships within the motivation–achievement cycle depend on the construct, timescale, and statistical model employed. Chapter 6 extends the framework to the interpersonal level by examining peer context. Peer influences were selective, with students’ perceptions of cooperation, comfort, mastery-oriented goals, and peer effort showing associations with their own motivation and effort. Taken together, the findings challenge the assumption of a simple motivation → effort → achievement pathway. Motivation does not automatically translate into higher academic achievement through greater effort. Instead, the role of motivation and effort depends on their form, timescale, and context. More stable, trait-like motivation shows more consistent links with academic achievement than short-term motivational fluctuations. Effort also emerges as a context-dependent mechanism: increases in study time can support performance over shorter timescales, whereas greater effort over longer periods does not necessarily predict better achievement. Achievement, in turn, appears to provide a more reliable source of subsequent motivational change.