Amidst the accelerating progress of generative artificial intelligence (GenAI), the rise of GenAI-assisted informal digital English learning (GAI-IDLE) platforms has prompted growing scholarly interest in understanding the psychological mechanisms that drive sustained learner engagement. Grounded in Self-Determination Theory (SDT), this study investigates how GAI-IDLE fosters user stickiness among Chinese university students by focusing on the psychological needs that influence intrinsic motivation. The constructs of perceived ease of use, perceived usefulness, control, and flow experience are interpreted within this motivational framework to reveal how learners’ internal psychological states influence their long-term engagement with GenAI-integrated learning environments. Guided by SDT, a survey was conducted with 669 participants, and the data were analyzed using Partial Least Squares Structural Equation Modeling (PLS-SEM) via Smart PLS 4.0. Empirical findings demonstrate that GAI-IDLE significantly promotes user stickiness through both direct and indirect pathways. Notably, control (β = 0.440, p < 0.001) and flow experience (β = 0.180, p < 0.001) emerged as strong mediators, underscoring the centrality of learner autonomy and immersive experiences in sustaining engagement. While perceived ease of use showed a moderate positive association, perceived usefulness did not exert a significant effect, suggesting that affective and experiential dimensions may be more critical than utilitarian perceptions in motivating continued use. The study highlights the need for GAI-IDLE platforms to foster intrinsic motivation and sustain meaningful engagement.
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