Related Experiment Video
Updated: Jun 22, 2025

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Group Synchronization During Collaborative Drawing Using Functional Near-Infrared Spectroscopy
Published on: August 5, 2022
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An outside individual option increases optimism and facilitates collaboration when groups form flexibly.
Ryutaro Mori1,2, Nobuyuki Hanaki3,4, Tatsuya Kameda5,6,7,8
1Department of Social Psychology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
Nature Communications
|July 1, 2024
Summary
Voluntary participation in group collaboration enhances success by filtering out pessimists and encouraging cooperation. An individual option aids collaboration when group formation is flexible, limiting negative externalities.
Area of Science:
- Behavioral Economics
- Game Theory
- Social Psychology
Background:
- Voluntary participation is crucial for collaboration but remains understudied.
- Existing literature often highlights negative impacts of individual options on group endeavors.
Purpose of the Study:
- To model collaboration as voluntary choices between group public goods and individual options.
- To investigate how voluntariness and the presence of an individual option affect collaborative success.
Main Methods:
- Developed a theoretical model of voluntary participation in group collaboration.
- Conducted experiments to test the model's predictions regarding group formation and individual choices.
Main Results:
- Voluntariness in collaboration boosts group success by filtering out pessimistic defectors and promoting cooperation.
- The negative impact of an individual option is mitigated when group formation is flexible, limiting the "externality" of individuals who leave.
Conclusions:
- Flexible group formation is key to leveraging individual options for enhanced collaborative outcomes.
- Voluntary participation, when structured effectively, can robustly improve group success in public goods games.
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