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Updated: Aug 14, 2025

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Distinct adaptation processes underlie multidigit force coordination for dexterous manipulation.

Michael D Smith1, Kevin Hooks2,3, Marco Santello1

  • 1School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona.

Journal of Neurophysiology
|January 11, 2023
PubMed
Summary
This summary is machine-generated.

Human sensorimotor adaptation involves distinct processes for dexterous manipulation. Two force coordination components, manipulation and internal moments, adapt differently to mechanical perturbations during object manipulation.

Keywords:
dexterous manipulationdigit forcesmotor adaptation

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Area of Science:

  • Neuroscience
  • Human sensorimotor control
  • Robotics

Background:

  • The human sensorimotor system adapts to environmental changes through motor command updates.
  • Adaptation mechanisms in dexterous manipulation, involving parallel digit interaction, are not well understood.
  • Dexterous manipulation requires precise force coordination among multiple effectors.

Purpose of the Study:

  • To investigate changes in digit force coordination during dexterous manipulation under mechanical perturbation.
  • To identify and characterize distinct components of force coordination adaptation.
  • To explore how these components respond to varying perturbation contexts.

Main Methods:

  • Utilized robotic manipulanda to apply mechanical perturbations during object lifting tasks.
  • Quantified two components of digit force coordination: manipulation moment and internal moment.
  • Analyzed adaptation rates and responses to changes in perturbation direction.

Main Results:

  • Task performance improvement correlated with increased manipulation moment and decreased internal moment.
  • Manipulation and internal moments exhibited different adaptation rates and sensitivities to perturbation history.
  • Manipulation moment adapted to previous opposing perturbations, while internal moment responded to previously experienced directions.

Conclusions:

  • Two distinct processes underlie the adaptation of multidigit force coordination in dexterous manipulation.
  • These components operate on different timescales and exhibit differential sensitivity to perturbation context.
  • Findings provide novel insights into the neural mechanisms of adaptive sensorimotor control in complex tasks.