Are you ready to jump? Predictive mechanisms in interpersonal coordination

Area of Science:

• Cognitive Psychology
• Neuroscience
• Motor Control

Background:

• Joint actions require precise temporal coordination between individuals.
• Online perceptual feedback aids coordination but is not always available.
• Understanding coordination without feedback is crucial for complex human interaction.

Purpose of the Study:

• To investigate how higher-level planning and motor simulation contribute to joint action coordination in the absence of online feedback.
• To examine the adaptation strategies employed by coactors in a joint action task with varying movement distances.

Main Methods:

• Pairs of participants performed synchronized forward jumps without visual or auditory feedback.
• Participants were informed of their own and their partner's required jump distance beforehand.
• Movement parameters were analyzed to assess temporal and spatial adjustments during action preparation and execution.

Main Results:

• Participants adjusted movement preparation and execution based on the difference in jump distances.
• Adaptation was primarily observed in the participant with the shorter jump distance, indicating an effort distribution.
• Coordination in the joint task showed similarities to individual interlimb coordination.

Conclusions:

• Joint action coordination without feedback involves adaptive strategies influenced by task demands.
• Motor simulation frameworks can explain the observed coordination patterns and effort distribution.
• Findings suggest shared underlying mechanisms for interlimb and joint action coordination.