Choice Requires Cognitive Availability: Protective Structure as an Enabling Condition for Autonomy Support in...

Does autonomy support retain its motivational benefits when digital distraction pervades the classroom? Drawing on self-determination theory and cognitive-resource perspectives, we proposed the Cognitive Availability Hypothesis: when attentional resources are depleted by smartphone presence, task choice cannot fulfill its motivational potential; protective structure-removing external digital distractions-functions as an enabling condition rather than a parallel instructional option. Using a fully counterbalanced 2 × 2 within-subjects crossover design (N = 121 Chinese undergraduates; 8 weeks), we independently manipulated protective structure (smartphone sequestration: present vs. absent) and autonomy support (task choice: present vs. absent) in university badminton classes, with flow as the primary outcome and class engagement as a secondary outcome. The Sequestration × Choice interaction was significant for flow: task choice had a negligible effect without sequestration but a moderate effect with sequestration. A parallel pattern emerged for engagement. Process-consistent analyses indicated that sequestration was associated with lower cognitive load and that the conditional choice effect on motivational regulation was most clearly expressed in identified regulation, the form of motivation that involves valuing and personally endorsing the activity. Manipulation checks confirmed that sequestration reduced perceived phone distraction without undermining perceived choice or choice authenticity. These findings suggest that in digitally saturated classrooms, establishing attentional conditions may precede, rather than merely complement, autonomy-supportive instruction.