Abstract
The main purpose of the present research was to investigate school intrin- sic and extrinsic motivation, and amotivation as a function of age in a sample of 1,600 elementary and high school students aged 9-17years. First, results revealed a system- atic decrease in intrinsic motivation and self-determined extrinsic motivation from age 9 to 12years, a slow stabilization until 15years old, followed by an increase after that point. Second, non self-determined extrinsic motivation showed a decrease up to 12yearsoldandaslowstabilizationafterthatpoint.Finally,amotivationwasrelatively low and stable from age 9 to 17years. Of importance is that the present results also revealed that teacher autonomy support mediated the age-school motivation relation- ships. The present results underscore the importance of a better understanding of the mechanisms through which lower intrinsic motivation and self-determined extrinsic motivationinolderstudentstakeplace,eventuallyleadingtoappropriateinterventions and optimal motivation in students of all ages.
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