Problem: Reply positively with follow-up: Yes, motivation can shift between intrinsic and extrinsic forms, and research shows it is not static. Self-Determination Theory (SDT) explains how extrinsic motivation can become more intrinsic through internalization as autonomy, competence, and relatedness increase (Deci & Ryan, 2000). For example, a student may begin studying to earn grades but later find personal meaning and enjoyment in the subject. Conversely, excessive external rewards can undermine intrinsic motivation (Deci et al., 1999). Not all theories address change equally, but SDT and expectancy value theory explicitly account for motivational shifts over time. Need Assignment Help?