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Measuring fingerpad deformation during active object manipulation.

Benoit P Delhaye1,2, Félicien Schiltz1,2, Allan Barrea1,2

  • 1Institute of Neuroscience, Université catholique de Louvain, Brussels, Belgium.

Journal of Neurophysiology
|September 8, 2021
PubMed
Summary
This summary is machine-generated.

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Researchers developed a new device to study fingertip skin deformation during active object manipulation. This device reveals how grip force impacts skin strain, crucial for understanding tactile feedback in controlling grasp stability.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Robotics

Background:

  • Fingertip skin deformation during object interaction provides critical sensory information.
  • Previous studies on finger mechanics often used passive setups, limiting understanding of active manipulation.
  • Understanding active deformation is key to deciphering tactile feedback for online motor control.

Purpose of the Study:

  • To develop and validate a novel device for measuring finger forces, skin deformations, and kinematics during active manipulation.
  • To quantify fingertip skin deformations during a controlled active manipulation task.
  • To establish a foundation for relating tactile sensory information to motor control adjustments.

Main Methods:

  • Development of a custom manipulandum device enabling simultaneous measurement of forces, 3D skin deformation imaging, and kinematics.
Keywords:
graspingsensorimotortactiletouch

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  • Testing the device with 18 participants performing a vertical oscillation task.
  • Analysis of skin strain and strain rates at the finger-object interface.

    • Main Results:

    • The developed device successfully captured finger forces, skin deformations, and kinematics during active manipulation.
    • Fingertip skin strains were found to be directly influenced by grip force levels.
    • Substantial skin strain rates (up to 100%/s) were observed during active tasks.

    Conclusions:

    • The novel device enables in-situ imaging of the finger-object interface during active manipulation.
    • Significant skin deformations occur at the finger-object interface, providing essential information for grasp stability.
    • This setup facilitates future research into the causal relationship between tactile sensing and motor control.