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Abstract Team games conceptualized as dynamical systems engender a view of emergent decision‐making behaviour under constraints, although specific effects of instructional and body‐scaling constraints have yet to be verified empirically. For this purpose, we studied the effects of task and individual constraints on decision‐making processes in basketball. Eleven experienced female players performed 350 trials in 1 vs. 1 sub‐phases of basketball in which an attacker tried to perturb the stable state of a dyad formed with a defender (i.e. break the symmetry). In Experiment 1, specific instructions (neutral, risk taking or conservative) were manipulated to observe effects on emergent behaviour of the dyadic system. When attacking players were given conservative instructions, time to cross court mid‐line and variability of the attacker's trajectory were significantly greater. In Experiment 2, body‐scaling of participants was manipulated by creating dyads with different height relations. When attackers were considerably taller than defenders, there were fewer occurrences of symmetry‐breaking. When attackers were considerably shorter than defenders, time to cross court mid‐line was significantly shorter than when dyads were composed of athletes of similar height or when attackers were considerably taller than defenders. The data exemplify how interacting task and individual constraints can influence emergent decision‐making processes in team ball games.
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