Relationship between player substitution and team performance in complex and dynamic behavior through movement complexity analysis

Establishing common ground is crucial for achieving a group goal.Common ground refers to a state in which representations of activities, role-sharing, and other members are mutually shared.This enables members to anticipate each other's actions and interact efficiently.However, team composition sometimes changes in real-world activities, and overall performance may decline after membership change.Cognitive science and organizational behavior studies have often used experimental cognitive tasks and suggested that membership change makes it difficult for the team to access the necessary information, leading to a decline in overall performance.In particular, the effects of membership change may be more pronounced in activities involving physical interactions, where situations change complexly and dynamically and explicit verbal communication is difficult; however, this has not yet been fully investigated.Thus, we utilized team sports in our approach.The purpose of this study was to investigate the relationship 1 Ichikawa et al. Player Substitution and Team Performancebetween player substitution and team performance.We conducted a field experiment using 3on-3 basketball, in which six female university players were divided into offensive and defensive teams and repeatedly engaged in mini-games.During the mini-games, one offensive player was substituted with a player from another university and the trials continued with a new team composition.This analysis quantified the complexity of each offensive player's movement using information entropy, and a logistic regression model was used to estimate the odds of an offensive win based on the complexity.The results showed that the relatively high entropy of the substitute player immediately after substitution was associated with lower odds of an offensive win than before substitution.Furthermore, as the trials continued, the offensive win rate recovered to the pre-substitution level.These findings suggest that the relatively high entropy observed immediately after substitution may reflect confusion during play and be associated with team performance.Although this case study did not directly measure common ground regarding strategies, establishing common ground may be important for the recovery of team performance after player substitution, given the experimental design.This study contributes to understanding complex and dynamic coordination processes.