Academic self-concept, autonomous academic motivation, and academic achievement: Mediating and additive effects

Three conceptual models were tested to examine the relationships among academic self-concept, autonomous academic motivation, and academic achievement. This allowed us to determine whether 1) autonomous academic motivation mediates the relation between academic self-concept and achievement, 2) academic self-concept mediates the relation between autonomous academic motivation and achievement, or 3) both motivational constructs have an additive effect on academic achievement. A total of 925 high school students (404 boys and 521 girls) were asked to complete a questionnaire on two occasions separated by a year interval. Results from SEM analyses provided good support for the hypothesized model positing that autonomous academic motivation mediates the academic self-concept–academic achievement relation. Results are discussed in light of self-determination theory and self-concept theory.

Research Highlights
► Time-1 academic self-concept predicts Time-2 autonomous academic motivation.
► Time-1 autonomous academic motivation predicts Time-2 academic achievement.
► Time-1 academic self-concept does not predict Time-2 academic achievement.