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Related Experiment Video

Updated: May 13, 2025

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Does precision grip research extend to unconstrained, multidigit grasping?

Fabrizio Lepori1, Frieder Hartmann2, Kira Dehn2

  • 1School of Psychology, University of Southampton, Southampton, United Kingdom.

Journal of Neurophysiology
|May 12, 2025
PubMed
Summary
This summary is machine-generated.

Humans often use more than two fingers for grasping, not just the precision grip. This study shows that object material impacts unconstrained grasping similarly to precision grips, suggesting broader applicability of existing research.

Keywords:
graspingmaterial configurationmultidigit graspprecision grip

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Related Experiment Videos

Last Updated: May 13, 2025

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Area of Science:

  • Human motor control
  • Biomechanics
  • Robotics

Background:

  • Most grasping research concentrates on the precision grip (thumb and index finger).
  • The human hand possesses multiple digits capable of various grasp configurations.
  • It remains unclear if precision grip findings generalize to unconstrained, multidigit grasping.

Purpose of the Study:

  • To investigate if object properties influence unconstrained grasping similarly to precision grips.
  • To compare precision grips with unconstrained, multidigit grasps.
  • To determine how additional digits affect grasp strategies.

Main Methods:

  • Participants grasped 3-D objects made of brass and wood using both precision and unconstrained grips.
  • Grasping strategies were analyzed for object contact points and digit placement.
  • Grasp variability was assessed under conflicting grasp factors.

Main Results:

  • Participants predominantly used multidigit grasps in unconstrained conditions, rarely selecting precision grips.
  • Grasp adjustments towards the object's center of mass occurred in both conditions.
  • Thumb and index finger placement remained consistent across grasp types, suggesting other digits provide support.

Conclusions:

  • Object material significantly affects unconstrained grasping, mirroring findings from precision grip research.
  • Previous research on precision grips may be applicable to unconstrained, multidigit grasping.
  • The findings suggest a unified principle governing grasp adjustments regardless of the number of digits used.