A Common Force-Sharing Pattern in Joint Action That Consists of Four People

Area of Science:

• Human motor control
• Group dynamics
• Biomechanics

Background:

• Understanding how individuals coordinate actions in groups is crucial for fields like robotics and sports science.
• Previous research has explored shared control but less is known about force-sharing dynamics in multi-person tasks.

Purpose of the Study:

• To investigate force-sharing patterns in joint actions involving 2-4 participants compared to solo actions.
• To determine how group size affects force production accuracy and variability.

Main Methods:

• 28 participants produced periodic isometric forces (5-10% MVC) at 1 Hz with their right hand.
• Force output was analyzed for correlations and variability in solo, 2-, 3-, and 4-person conditions.

Main Results:

• In 3- and 4-person tasks, negative force correlations were observed between some participants, with others producing intermediate forces.
• Force and interval errors, along with force variability, were significantly smaller in 3- and 4-person groups compared to individuals.

Conclusions:

• Cooperative force control enhances performance in group tasks.
• Larger groups (3-4 people) demonstrate superior force regulation and coordination compared to individuals performing solo actions.