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Group Synchronization During Collaborative Drawing Using Functional Near-Infrared Spectroscopy

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Interpersonal Fitts' law: when two perform as one.

Justin M Fine¹, Eric L Amazeen

¹Department of Psychology, Arizona State University, Box 871104, Tempe, AZ 85287, USA. Justin.Fine@ASU.edu

Experimental Brain Research

|May 7, 2011

Summary

Coordination between individuals and within individuals follows similar processes, even when task difficulty varies. This challenges traditional models of centralized control in movement and attention.

Area of Science:

Cognitive Psychology
Motor Control
Human-Computer Interaction

Background:

Fitts' law typically predicts movement time based on target distance and size.
Coordination involves synchronizing movements, whether within one person or between multiple people.
Understanding coordination mechanisms is crucial for designing effective human-machine interfaces and understanding social interactions.

Purpose of the Study:

To investigate intra- and interpersonal coordination using a bimanual Fitts' law task.
To examine how unequal target difficulty affects movement times in unimanual, intrapersonal, and interpersonal coordination.
To explore the role of processing speed and attention in coordinated tasks.

Main Methods:

Participants performed rhythmic tapping between targets using one hand (unimanual), two hands (intrapersonal), or one hand with a partner (interpersonal).

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Target sizes and distances were independently manipulated for each hand to create unequal difficulty levels.

Movement times and processing speed (index of performance) were measured.

Main Results:

Movement times were similar across hands when target difficulty was unequal, violating Fitts' law predictions.
Processing speed increased with task difficulty, indicating heightened attention in both individual and dyadic conditions.
Intrapersonal coordination showed stronger coordination tendencies than interpersonal coordination.

Conclusions:

Similar underlying processes, potentially independent of centralized control, govern both intrapersonal and interpersonal coordination.
While shared mechanisms exist, distinct centralized mechanisms may still play a role in intrapersonal coordination.
Findings suggest a nuanced understanding of coordination beyond traditional Fitts' law and centralized control models is needed.