Buddy up: the Köhler effect applied to health games.

@article{Feltz2011BuddyUT,
  title={Buddy up: the K{\"o}hler effect applied to health games.},
  author={D. L. Feltz and Norbert L. Kerr and Brandon Irwin},
  journal={Journal of sport \& exercise psychology},
  year={2011},
  volume={33 4},
  pages={
          506-26
        }
}
The present investigation examined the Köhler motivation gain effect in a health game using an absent partner, presented virtually. The Köhler effect occurs when an inferior team member performs a difficult task better in a team or coaction situation than one would expect from knowledge of his or her individual performance. The effect has been strongest in conjunctive task conditions in which the group's potential productivity is equal to the productivity of its least capable member… 

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