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Effect of Object and Task Properties on Bimanual Transport.

Yuzuko C Nakamura1, Carol A O'Sullivan2,3, Nancy S Pollard1

  • 1a Computer Science Department , Carnegie Mellon University , Pittsburgh , USA.

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|May 10, 2018
PubMed
Summary

People choose between using one hand, two hands, or passing objects between hands based on task demands. Object configuration and balance significantly influence strategy, while size and weight play a minor role, potentially minimizing body rotation.

Keywords:
arm movementsbimanual performancegraspingmotion planning

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Area of Science:

  • Human-Computer Interaction
  • Biomechanics
  • Cognitive Psychology

Background:

  • Bimanual object manipulation is common, yet factors influencing strategy choice (unimanual, hand-off, bimanual) remain unclear.
  • Understanding these factors is crucial for designing intuitive human-robot interactions and assistive technologies.

Purpose of the Study:

  • To investigate how object properties and task configuration affect the choice of unimanual, hand-off, and bimanual transport strategies.
  • To determine if minimizing body rotation influences strategy selection during object transport tasks.

Main Methods:

  • Participants performed a bowl-moving task under varying conditions of object size, weight, starting/ending positions (configuration), and the need for balance.
  • Observed and analyzed the frequency of unimanual, hand-off, and bimanual transport strategies.
  • Measured transport duration and body rotation.

Main Results:

  • Object configuration and the need for balance significantly influenced strategy choice, whereas object size and weight had a lesser impact.
  • Hand-offs were favored for left-right movements, unimanual for front-back, and bimanual strategies were less affected by configuration.
  • Balancing the object promoted unimanual and bimanual strategies over hand-offs.
  • Analysis suggested that minimizing body rotation may be a key factor driving strategy selection.

Conclusions:

  • Task configuration and object balance are primary determinants of bimanual transport strategy.
  • The human motor system appears to optimize for efficiency, potentially by minimizing body rotation, when selecting object transport methods.