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Ryan and Deci present self-determination theory as a broad account of motivation, personality development, and wellness organized through six related mini-theories. Its central claim is that people function and develop more fully when social conditions support three basic psychological needs: autonomy, the experience of acting with volition; competence, effectiveness in valued activity; and relatedness, mutual care and belonging.
Motivation varies in quality, not only quantity. External regulation can be internalized through introjected, identified, and integrated forms, while autonomy support promotes more durable engagement than control. The theory also distinguishes intrinsic motivation, goal contents, causality orientations, relationship processes, and vitality. Evidence spans education, work, health, sport, psychotherapy, digital environments, and culture.
Need support does not mean permissiveness or independence from others; structure, meaningful rationales, acknowledgement of feelings, and choice can coexist. The framework helps educators evaluate whether practices foster agency and competence or produce compliance by pressure.
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Ryan and Deci clarify intrinsic and extrinsic motivation through self-determination theory. Intrinsic motivation concerns doing an activity for its inherent interest or enjoyment.
Extrinsic motivation concerns instrumental reasons, but it is not uniformly controlling: regulation ranges from external pressure and internal compulsion through personally endorsed identification and integration. The quality of motivation therefore matters alongside its quantity. Environments that support the basic psychological needs for autonomy, competence, and relatedness foster intrinsic motivation, internalisation, persistence, learning, performance, and well-being; controlling rewards, threats, meaningless demands, or thwarted needs can produce more fragile engagement. Rewards do not have a single inevitable effect—their informational or controlling meaning, contingency, and context matter. The review connects definitions, theory, empirical findings, educational practice, cultural considerations, and research directions.
For educators, useful design combines optimal challenge, clear structure and feedback, meaningful rationales, acknowledgement of feelings, opportunities for agency, and caring relationships. Not every school activity will become intrinsically enjoyable, but learners can still understand its value and engage with a greater sense of ownership.
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