Challenge Under Pressure Contextual Interference or Differential Learning

This study compared the effects of blocked practice, random practice (contextual interference), and differential learning on acquisition, retention, and performance under psychological pressure of a basketball jump shot in novice performers. Forty-eight right-handed adolescents with no prior basketball experience were randomly assigned to one of four groups: Blocked, Random, Differential, or Control (n = 12 each). After a pretest (18 trials at 5 m), participants completed three days of practice. Blocked practice involved constant distances across days (4, 5, or 6 m), random practice varied distances trial-to-trial without consecutive repetitions, and differential learning used a fixed 5 m distance with substantial trial-to-trial variations in movement execution. Retention was tested three days later (18 trials at 5 m), followed immediately by a pressure phase with identical trials under induced anxiety. During acquisition, blocked practice produced superior accuracy compared to random and differential conditions. In retention, both Random and Differential groups outperformed the Control group, while only the Differential group showed a significant advantage over Blocked practice. Under pressure conditions, the Differential group outperformed both Blocked and Control groups, whereas the Random group did not differ significantly from the other groups. The findings are interpreted within a dynamical systems perspective, highlighting the role of optimal stochastic fluctuations in promoting implicit motor processes and self-organization, thereby enhancing skill robustness in high-stakes competitive contexts.